Jiangjia Ravine is a world-famous debris flow valley in Dongchuan,Yunnan Province,China.Every year large numbers of landslides and collapses happened and caused enormous damages to people's properties and lives.Wi...Jiangjia Ravine is a world-famous debris flow valley in Dongchuan,Yunnan Province,China.Every year large numbers of landslides and collapses happened and caused enormous damages to people's properties and lives.With longtime observation and testing in Jiangjia Ravine we had found out one kind of special landslide which had the characteristics of landslide and collapse.Landslide and collapse supplied sufficient materials for debris flow.When a debris flow broke out,some kind of intergrowth existed among rainfall,landslide and debris flow.In order to study the intergrowth and some key parameters,we carried out artificial rainfall landslide tests and model experiments to observe the phenomena such as collapse,surface slide and surface flow.By observing the experimental phenomena and monitoring water contents,the transformation process among landslide deposits and debris flow under the condition of rainfall had been analyzed.Research results revealed the relationship of this kind of intergrowth among rainfall,landslide and debris flow in Jiangjia Ravine.Meanwhile,it was found that this kind of intergrowth relationship existed only when the moisture content was in a certain range.That is,the critical state seemed to be existed in the transformation process.展开更多
Human beings have had a tremendous i mpact on natural ecosystems and are n ow the principal power to change the biosphere.It is logical t hat we should pay close attention to t he interaction between human system s an...Human beings have had a tremendous i mpact on natural ecosystems and are n ow the principal power to change the biosphere.It is logical t hat we should pay close attention to t he interaction between human system s and environ-mental systems.Taking Minqin basin,Gansu Province,as a case,this paper focuses on the evolution of regional physi-cal environments and the cultural sy stems by which people maintain their relationships with those environme nts.This pa-per presents the conceptual framewo rk for the man-land system.Expectin g to accelerate the regional sustain able develop-ment,it also analyses the evolution ary mechanism of regional man-land s ystem.On the basis of reviewing and a nalyzing the evolution of man-land system in Minqin basin,the paper also brings fo rward an adjusting mode for the studi ed area,which consists of three aspects:to b uild up a concept that economic growt h must harmonize with environmental quality’s and land productivity’s improvemen t;to make a whole planning and management in the drainage area;and to push for-ward the technique of water-saving i rrigation and establish water-saving agricultural system.It’s meanin gful for resource exploitation and sustainable development of Chinese northwestern arid area,which is represented by Minqin basin,by under-standing what great changes the basin has experienced and is experiencin g at the global background,and studying its time order and territorial structure,th e system’s character and law of evolu tion,trend and the regulating ways t o improve man-land relationship.展开更多
The survival chance of epiphytie orchids today not only depends on the natural site conditions required by the orchids but also on anthropogenic changes in site conditions. This study answers two questions: (1) Wha...The survival chance of epiphytie orchids today not only depends on the natural site conditions required by the orchids but also on anthropogenic changes in site conditions. This study answers two questions: (1) What is the ecological niche of the different epiphytic orchid species? (2) What are the ecological factors that threaten epiphytic orchid's population under anthropogenic disturbances? Our study area was the Kathmandu valley, Nepal, with its subtropical forest. We established 156 systematically selected sampling points in the Kathmandu area covering different types of ecosystems under human impacts such as densely populated area, agricultural land, mixed agricultural and settled area, old tree patches, and a natural forest in a national park. The ecological niche of the orchid species was analyzed with a principal component analysis (PCA). The correlations between the different site factors were statistically significant. Spearman's rank correlation matrices showed that the variables land-use intensities with altitude, and height with diameter in breast height (dbh) of host had the highest significant positive correlation coefficient (0.67 and 0.64 respectively). On the other hand, host bark pH and altitude as well as land use had a significantly strong negative correlation coefficient (-0.80 and -0.61, respectively). Different epiphytic orchid species interact differently with the given set of environmental factors: for occurrence of Vanda cristata there is no single environmental factor of special influence, while for Rhynehostylis retusa high bark pH and high light availability are important. First two axis of the PCA explained more than 50% of the total variance. Most orchid species occupy a specific, narrow niche in this ecological space. The main causes of anthropogenie influence of orchid population in the Kathmandu Valley are loss of adequate host trees (species and size) and increasing air pollution, resulting in increasing host bark pH.展开更多
In this 21 st century, whether we like it or not, it is very clear that the Intemet, social media, and all ad of the related technology have come to stay. This new technological discovery has brought great and wonderf...In this 21 st century, whether we like it or not, it is very clear that the Intemet, social media, and all ad of the related technology have come to stay. This new technological discovery has brought great and wonderful benefits to our family's lives and relationships. However as it is always the case with any new innovations, it has its own negative side. This paper aims at investigating what actually social media is and how it translates to children, especially African children, as it relates to family and social living. Actually Internet provide benefits in areas such as cognitive and social development, it also presents risks together with opportunities for children's growth and development. It is common today to see children spending great quality of their time using other social websites. It is also evidenced that Interact provide benefits in the area of emotional and intellectual development and at the same time present risk as well as opportunities to children's development in functional and societal challenges. Therefore social media gives the children of the present age the opportunity to enter into global entertainment and communication. As a result of this development, there is now Internet addiction of children. Hence, there is serious need for parents to be aware of the nature of social media sites, their children are using. This is because not all of them are healthy environments for children. Experts such as childhood educators and psychologist even Paediatricians are equipped and so are better hands to assist parents not only to know and understand these websites but to encourage proper use and make them to monitor for potential problems such as cyber-bullying, facebook depression, exposure to inappropriate content and sexting. This paper proffers some recommendation that certainly will assist parents to bring up their children up to be vibrant adult even in this technological era.展开更多
In order to effectively decrease the safety accidents caused by coal miners’human errors,this paper probes into the causality between human errors and life events,coping,psychological stress,psychological function,ph...In order to effectively decrease the safety accidents caused by coal miners’human errors,this paper probes into the causality between human errors and life events,coping,psychological stress,psychological function,physiological function based on life events’vital influence on human errors,establishing causation mechanism model of coal miners’human errors in the perspective of life events by the researching method of structural equation.The research findings show that life events have significantly positive influence on human errors,with a influential effect value of 0.7945 and a influential effect path of‘‘life events—psychological stress—psychological function—physiological function—human errors’’and‘‘life events—psychological stress—physiological function—human errors’’.展开更多
This paper's purpose is to present a reflective analysis about the process of transnationalization in which the technique of assisted human reproduction has been going to the extent that such a procedure has been rev...This paper's purpose is to present a reflective analysis about the process of transnationalization in which the technique of assisted human reproduction has been going to the extent that such a procedure has been revealed as a true "fertility tourism", offered through packages for those people who have financial conditions, but cannot through natural means to realize the dream of membership. Through the dialectic method of discourse, promoting the comparison of the thought of many authors who focus on issues such as globalization, commodification of human, technical exacerbation detriment of humans, and their interpersonal relations, the author seeks to introduce issues that are the order of day with respect to this global market arising from the tremendous advances reproductive techniques in a society marked by economic interests, it turns much more to the consumer and considers the human being as an additional asset to be sold, since its conception. The author acknowledges that they cease for tourism human reproduction is a trade that is worth of human frailty, because relying on one of the most intimate aspects of life: the desire to be a mother or father or ultimately, the perpetuation of the species.展开更多
In the modem project, how to understand and deal with the relationship between man and nature correctly, and how to treat ecology, resource, lives of animals and plants correctly have become the outstanding and urgent...In the modem project, how to understand and deal with the relationship between man and nature correctly, and how to treat ecology, resource, lives of animals and plants correctly have become the outstanding and urgent subjects day by day. Thee article illustrated that the new views of nature and environment are the important philosophical foundation of project ethics from three aspects: the recognition of the relationship between man and nature, the meditation of traditional mode of production, and the ecological and environmental consciousness.展开更多
The paper researches on the pattern of man-land relationship of artificial oasis in the east of north Tian-shan Mountain,the development of Qitai artificial oasis and its relationship with envirorvnet.analyzes the fac...The paper researches on the pattern of man-land relationship of artificial oasis in the east of north Tian-shan Mountain,the development of Qitai artificial oasis and its relationship with envirorvnet.analyzes the facors influencing the change of Qitai artificiul oasis and its relationship with envirorunent,analyzes the factors influencing the change of Qitai artificial oasis and economic growth through grey analysis,and suggests the approaches of sustainable development of Qitai artificial oasis.Research shows that the pattern of artificial oasis and its environment had gone through three phases:the relatively harmonious stage.the unharmonious stage,and the new fragile balance stage.It also shows that the garden and the shelter-forest are useful to the sustainable development of Qitai oasis according to grey analysis.展开更多
AIM:To evaluate the effects of growth hormone(GH) on the histology of small intestines which might be related to the role of insulin like growth factor(IGF)-I, IGF-binding protein 3(IGFBP-3)and its receptors. METHODS:...AIM:To evaluate the effects of growth hormone(GH) on the histology of small intestines which might be related to the role of insulin like growth factor(IGF)-I, IGF-binding protein 3(IGFBP-3)and its receptors. METHODS:Twelve week-old adult male Wistar albino rats were divided into two groups.The study group(n =10),received recombinant human growth hormone (rGH)at a dose of 2 mg/kg per day subcutaneously for 14 d and the control group(n=10)received physiologic serum.Paraffin sections of jejunum were stained with periodic acid shift(PAS)and hematoxylin and eosin(HE) for light microscopy.They were also examined for IGF-I, IGFBP-3 and IGF-receptor immunoreactivities.Staining intensity was graded semi-quantitatively using the HS- CORE. RESULTS:Goblet cells and the cells in crypt epitheliawere significantly increased in the study group compared to that of the control group.We have demonstrated an increase of IGF-I and IGFBP-3 immunoreactivities in surface epithelium of the small intestine by GH application.IGF-I receptor immunoreactivities of crypt,villous columnar cells,enteroendocrine cells and muscularis mucosae were also more strongly positive in the study group compared to those of in the control group. CONCLUSION:These findings confirm the important trophic and protective role of GH in the homeostasis of the small intestine.The trophic effect is mediated by an increase in IGF-I synthesis in the small intestine, but the protective effect is not related to IGF-I.展开更多
In the relationship between humans and the environment,all human activities depend on the geographical environment,which serves as the spatial place and material foundation for human life.This study provides a perspec...In the relationship between humans and the environment,all human activities depend on the geographical environment,which serves as the spatial place and material foundation for human life.This study provides a perspective on the human-environment relationship,using a case study of the Dashanbao Mountainous Outdoor Tourism Planning Area in Zhaotong,Yunnan.This study employed methods such as literature review,on-site investigation,and GIS spatial analysis to analyze the functional characteristics of the regional subject,spatial structuring,and spatiotemporally variable ordered processes of Dashanbao as a tourism destination from the perspective of human-environment relationships.The results indicate that under the guidance of the human-environment relationship system philosophy,the construction path of the“ecological space,production space,and living space”includes three main aspects:(1)The formation of five major project blocks and five functional zones to meet the diverse needs of different groups;(2)The establishment of a"multi-core module"structure optimizing the spatial layout of the tourism destination;and(3)With the changes in space and time,the convergence of elements in each block can form a composite mountainous outdoor tourism space with the characteristics of“ecology,life,and production”.The results of this study provide a scientific basis for promoting the sustainable development of tourism regional systems with mountainous characteristics.展开更多
To accelerate the breeding process of cultivated Ophiocordyceps sinensis and increase its yield,it is important to identify molecular fingerprint of dominant O.sinensis.In the present study,we collected 3 batches of i...To accelerate the breeding process of cultivated Ophiocordyceps sinensis and increase its yield,it is important to identify molecular fingerprint of dominant O.sinensis.In the present study,we collected 3 batches of industrially cultivated O.sinensis product with higher yield than the others and compared their internal transcribed spacer(ITS)sequences with the wild and the reported.The ITS sequence was obtained by bidirectional sequencing and analyzed with molecular systematics as a DNA barcode for rapid and accurate identification of wild and cultivated O.sinensis collected.The ITS sequences of O.sinensis with detailed collection loci on NCBI were downloaded to construct a phylogenetic tree together with the sequences obtained from the present study by using neighbor-joining method based on their evolution relationship.The information on collection loci was analyzed with ArcGIS 10.2 to demonstrate the geographic distribution of these samples and thus to determine the origin of the dominant samples.The results showed that all wild and cultivated samples were identified as O.sinensis and all sequences were divided into seven phylogenetic groups in the tree.Those groups were precisely distributed on the map and the process of their system evolution was clearly presented.The three cultivated samples were clustered into two dominant groups,showing the correlation between the industrially cultivated samples and the dominant wild samples,which can provide references for its optimized breeding in the future.展开更多
Scientifically mitigating the ecological risks in tourist destinations is an important foundation for thehealthy and sustainable development of tourist destinations.In this study,we summarize the progress of ecologica...Scientifically mitigating the ecological risks in tourist destinations is an important foundation for thehealthy and sustainable development of tourist destinations.In this study,we summarize the progress of ecologicalrisk research in tourist destinations at home and abroad and the internal logic of ecological risk research in touristdestinations.Current research adhered to an internal framework encompassing the following stages:formation andanalysis of ecological risks in tourism destinations,exposure characterization,effect exploration,risk assessment,and risk management.Specific research results were summarized in four aspects:the analysis of ecological risksources,assessment of acceptors and endpoints,ecological risk assessment,perceptions of ecological risk,predictions and management of ecological risks within tourism destinations.Future research should prioritize fosteringa harmonious relationship between humanity and natural environment,which necessitates strengthening thefoundation of a multidisciplinary theory.Future research should focus on the formation mechanisms of ecologicalrisks in tourist destinations,the mechanisms of interaction among ecological risk sources,receptors,and endpoints,ecological risk assessments of tourist destinations based on multiple risk sources,ecological risk assessments oftypical tourism destinations and their key exposures,enhancing the ecological risk assessment index system fortourist destinations by incorporating data from various sources,conducting simulation studies to develop ecologicalrisk warning systems for tourist destinations,exploring the spatiotemporal scale coupling relationships of ecologicalrisks in tourist destinations,examining the perceptions and attitudes of different stakeholders towards ecologicalrisks in tourist destinations,evaluating the cost-benefit of ecological risk adaptation,and performing preventionmeasures in tourist destinations.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.50709035,40672193)the Youth Science and Technology Dawn Plan of Wuhan,China(Grant No.20065004116-42)
文摘Jiangjia Ravine is a world-famous debris flow valley in Dongchuan,Yunnan Province,China.Every year large numbers of landslides and collapses happened and caused enormous damages to people's properties and lives.With longtime observation and testing in Jiangjia Ravine we had found out one kind of special landslide which had the characteristics of landslide and collapse.Landslide and collapse supplied sufficient materials for debris flow.When a debris flow broke out,some kind of intergrowth existed among rainfall,landslide and debris flow.In order to study the intergrowth and some key parameters,we carried out artificial rainfall landslide tests and model experiments to observe the phenomena such as collapse,surface slide and surface flow.By observing the experimental phenomena and monitoring water contents,the transformation process among landslide deposits and debris flow under the condition of rainfall had been analyzed.Research results revealed the relationship of this kind of intergrowth among rainfall,landslide and debris flow in Jiangjia Ravine.Meanwhile,it was found that this kind of intergrowth relationship existed only when the moisture content was in a certain range.That is,the critical state seemed to be existed in the transformation process.
文摘Human beings have had a tremendous i mpact on natural ecosystems and are n ow the principal power to change the biosphere.It is logical t hat we should pay close attention to t he interaction between human system s and environ-mental systems.Taking Minqin basin,Gansu Province,as a case,this paper focuses on the evolution of regional physi-cal environments and the cultural sy stems by which people maintain their relationships with those environme nts.This pa-per presents the conceptual framewo rk for the man-land system.Expectin g to accelerate the regional sustain able develop-ment,it also analyses the evolution ary mechanism of regional man-land s ystem.On the basis of reviewing and a nalyzing the evolution of man-land system in Minqin basin,the paper also brings fo rward an adjusting mode for the studi ed area,which consists of three aspects:to b uild up a concept that economic growt h must harmonize with environmental quality’s and land productivity’s improvemen t;to make a whole planning and management in the drainage area;and to push for-ward the technique of water-saving i rrigation and establish water-saving agricultural system.It’s meanin gful for resource exploitation and sustainable development of Chinese northwestern arid area,which is represented by Minqin basin,by under-standing what great changes the basin has experienced and is experiencin g at the global background,and studying its time order and territorial structure,th e system’s character and law of evolu tion,trend and the regulating ways t o improve man-land relationship.
文摘The survival chance of epiphytie orchids today not only depends on the natural site conditions required by the orchids but also on anthropogenic changes in site conditions. This study answers two questions: (1) What is the ecological niche of the different epiphytic orchid species? (2) What are the ecological factors that threaten epiphytic orchid's population under anthropogenic disturbances? Our study area was the Kathmandu valley, Nepal, with its subtropical forest. We established 156 systematically selected sampling points in the Kathmandu area covering different types of ecosystems under human impacts such as densely populated area, agricultural land, mixed agricultural and settled area, old tree patches, and a natural forest in a national park. The ecological niche of the orchid species was analyzed with a principal component analysis (PCA). The correlations between the different site factors were statistically significant. Spearman's rank correlation matrices showed that the variables land-use intensities with altitude, and height with diameter in breast height (dbh) of host had the highest significant positive correlation coefficient (0.67 and 0.64 respectively). On the other hand, host bark pH and altitude as well as land use had a significantly strong negative correlation coefficient (-0.80 and -0.61, respectively). Different epiphytic orchid species interact differently with the given set of environmental factors: for occurrence of Vanda cristata there is no single environmental factor of special influence, while for Rhynehostylis retusa high bark pH and high light availability are important. First two axis of the PCA explained more than 50% of the total variance. Most orchid species occupy a specific, narrow niche in this ecological space. The main causes of anthropogenie influence of orchid population in the Kathmandu Valley are loss of adequate host trees (species and size) and increasing air pollution, resulting in increasing host bark pH.
文摘In this 21 st century, whether we like it or not, it is very clear that the Intemet, social media, and all ad of the related technology have come to stay. This new technological discovery has brought great and wonderful benefits to our family's lives and relationships. However as it is always the case with any new innovations, it has its own negative side. This paper aims at investigating what actually social media is and how it translates to children, especially African children, as it relates to family and social living. Actually Internet provide benefits in areas such as cognitive and social development, it also presents risks together with opportunities for children's growth and development. It is common today to see children spending great quality of their time using other social websites. It is also evidenced that Interact provide benefits in the area of emotional and intellectual development and at the same time present risk as well as opportunities to children's development in functional and societal challenges. Therefore social media gives the children of the present age the opportunity to enter into global entertainment and communication. As a result of this development, there is now Internet addiction of children. Hence, there is serious need for parents to be aware of the nature of social media sites, their children are using. This is because not all of them are healthy environments for children. Experts such as childhood educators and psychologist even Paediatricians are equipped and so are better hands to assist parents not only to know and understand these websites but to encourage proper use and make them to monitor for potential problems such as cyber-bullying, facebook depression, exposure to inappropriate content and sexting. This paper proffers some recommendation that certainly will assist parents to bring up their children up to be vibrant adult even in this technological era.
基金supported by the National Natural Science Foundation of China (No. 71271206)
文摘In order to effectively decrease the safety accidents caused by coal miners’human errors,this paper probes into the causality between human errors and life events,coping,psychological stress,psychological function,physiological function based on life events’vital influence on human errors,establishing causation mechanism model of coal miners’human errors in the perspective of life events by the researching method of structural equation.The research findings show that life events have significantly positive influence on human errors,with a influential effect value of 0.7945 and a influential effect path of‘‘life events—psychological stress—psychological function—physiological function—human errors’’and‘‘life events—psychological stress—physiological function—human errors’’.
文摘This paper's purpose is to present a reflective analysis about the process of transnationalization in which the technique of assisted human reproduction has been going to the extent that such a procedure has been revealed as a true "fertility tourism", offered through packages for those people who have financial conditions, but cannot through natural means to realize the dream of membership. Through the dialectic method of discourse, promoting the comparison of the thought of many authors who focus on issues such as globalization, commodification of human, technical exacerbation detriment of humans, and their interpersonal relations, the author seeks to introduce issues that are the order of day with respect to this global market arising from the tremendous advances reproductive techniques in a society marked by economic interests, it turns much more to the consumer and considers the human being as an additional asset to be sold, since its conception. The author acknowledges that they cease for tourism human reproduction is a trade that is worth of human frailty, because relying on one of the most intimate aspects of life: the desire to be a mother or father or ultimately, the perpetuation of the species.
文摘In the modem project, how to understand and deal with the relationship between man and nature correctly, and how to treat ecology, resource, lives of animals and plants correctly have become the outstanding and urgent subjects day by day. Thee article illustrated that the new views of nature and environment are the important philosophical foundation of project ethics from three aspects: the recognition of the relationship between man and nature, the meditation of traditional mode of production, and the ecological and environmental consciousness.
文摘The paper researches on the pattern of man-land relationship of artificial oasis in the east of north Tian-shan Mountain,the development of Qitai artificial oasis and its relationship with envirorvnet.analyzes the facors influencing the change of Qitai artificiul oasis and its relationship with envirorunent,analyzes the factors influencing the change of Qitai artificial oasis and economic growth through grey analysis,and suggests the approaches of sustainable development of Qitai artificial oasis.Research shows that the pattern of artificial oasis and its environment had gone through three phases:the relatively harmonious stage.the unharmonious stage,and the new fragile balance stage.It also shows that the garden and the shelter-forest are useful to the sustainable development of Qitai oasis according to grey analysis.
文摘AIM:To evaluate the effects of growth hormone(GH) on the histology of small intestines which might be related to the role of insulin like growth factor(IGF)-I, IGF-binding protein 3(IGFBP-3)and its receptors. METHODS:Twelve week-old adult male Wistar albino rats were divided into two groups.The study group(n =10),received recombinant human growth hormone (rGH)at a dose of 2 mg/kg per day subcutaneously for 14 d and the control group(n=10)received physiologic serum.Paraffin sections of jejunum were stained with periodic acid shift(PAS)and hematoxylin and eosin(HE) for light microscopy.They were also examined for IGF-I, IGFBP-3 and IGF-receptor immunoreactivities.Staining intensity was graded semi-quantitatively using the HS- CORE. RESULTS:Goblet cells and the cells in crypt epitheliawere significantly increased in the study group compared to that of the control group.We have demonstrated an increase of IGF-I and IGFBP-3 immunoreactivities in surface epithelium of the small intestine by GH application.IGF-I receptor immunoreactivities of crypt,villous columnar cells,enteroendocrine cells and muscularis mucosae were also more strongly positive in the study group compared to those of in the control group. CONCLUSION:These findings confirm the important trophic and protective role of GH in the homeostasis of the small intestine.The trophic effect is mediated by an increase in IGF-I synthesis in the small intestine, but the protective effect is not related to IGF-I.
基金The Sichuan Provincial Key Research Base of Philosophy and Social Sciences(WRF202401)The Key Research Base of Sichuan Provincial Department of Education Humanities and Social Science(XXTYCY2023C17)The Sichuan Provincial Key Research Base for Humanities and Social Sciences in Higher Education(HWYD2024B10)。
文摘In the relationship between humans and the environment,all human activities depend on the geographical environment,which serves as the spatial place and material foundation for human life.This study provides a perspective on the human-environment relationship,using a case study of the Dashanbao Mountainous Outdoor Tourism Planning Area in Zhaotong,Yunnan.This study employed methods such as literature review,on-site investigation,and GIS spatial analysis to analyze the functional characteristics of the regional subject,spatial structuring,and spatiotemporally variable ordered processes of Dashanbao as a tourism destination from the perspective of human-environment relationships.The results indicate that under the guidance of the human-environment relationship system philosophy,the construction path of the“ecological space,production space,and living space”includes three main aspects:(1)The formation of five major project blocks and five functional zones to meet the diverse needs of different groups;(2)The establishment of a"multi-core module"structure optimizing the spatial layout of the tourism destination;and(3)With the changes in space and time,the convergence of elements in each block can form a composite mountainous outdoor tourism space with the characteristics of“ecology,life,and production”.The results of this study provide a scientific basis for promoting the sustainable development of tourism regional systems with mountainous characteristics.
基金supported by the Macao Science and Technology Development Fund(No.062/2017/A2)
文摘To accelerate the breeding process of cultivated Ophiocordyceps sinensis and increase its yield,it is important to identify molecular fingerprint of dominant O.sinensis.In the present study,we collected 3 batches of industrially cultivated O.sinensis product with higher yield than the others and compared their internal transcribed spacer(ITS)sequences with the wild and the reported.The ITS sequence was obtained by bidirectional sequencing and analyzed with molecular systematics as a DNA barcode for rapid and accurate identification of wild and cultivated O.sinensis collected.The ITS sequences of O.sinensis with detailed collection loci on NCBI were downloaded to construct a phylogenetic tree together with the sequences obtained from the present study by using neighbor-joining method based on their evolution relationship.The information on collection loci was analyzed with ArcGIS 10.2 to demonstrate the geographic distribution of these samples and thus to determine the origin of the dominant samples.The results showed that all wild and cultivated samples were identified as O.sinensis and all sequences were divided into seven phylogenetic groups in the tree.Those groups were precisely distributed on the map and the process of their system evolution was clearly presented.The three cultivated samples were clustered into two dominant groups,showing the correlation between the industrially cultivated samples and the dominant wild samples,which can provide references for its optimized breeding in the future.
基金The National Social Science Foundation of China(19BJY205)。
文摘Scientifically mitigating the ecological risks in tourist destinations is an important foundation for thehealthy and sustainable development of tourist destinations.In this study,we summarize the progress of ecologicalrisk research in tourist destinations at home and abroad and the internal logic of ecological risk research in touristdestinations.Current research adhered to an internal framework encompassing the following stages:formation andanalysis of ecological risks in tourism destinations,exposure characterization,effect exploration,risk assessment,and risk management.Specific research results were summarized in four aspects:the analysis of ecological risksources,assessment of acceptors and endpoints,ecological risk assessment,perceptions of ecological risk,predictions and management of ecological risks within tourism destinations.Future research should prioritize fosteringa harmonious relationship between humanity and natural environment,which necessitates strengthening thefoundation of a multidisciplinary theory.Future research should focus on the formation mechanisms of ecologicalrisks in tourist destinations,the mechanisms of interaction among ecological risk sources,receptors,and endpoints,ecological risk assessments of tourist destinations based on multiple risk sources,ecological risk assessments oftypical tourism destinations and their key exposures,enhancing the ecological risk assessment index system fortourist destinations by incorporating data from various sources,conducting simulation studies to develop ecologicalrisk warning systems for tourist destinations,exploring the spatiotemporal scale coupling relationships of ecologicalrisks in tourist destinations,examining the perceptions and attitudes of different stakeholders towards ecologicalrisks in tourist destinations,evaluating the cost-benefit of ecological risk adaptation,and performing preventionmeasures in tourist destinations.