Using path analysis, correlation analysis, partial correlation analysis and system dynamics method to study the driving force of cultivated land in Qinghai Lake Area, and using gradually regression analysis to establi...Using path analysis, correlation analysis, partial correlation analysis and system dynamics method to study the driving force of cultivated land in Qinghai Lake Area, and using gradually regression analysis to establish the driving force model of utilized change of cultivated land. Driving factors, action mechanism and process of utilized change of cultivated land were analyzed, and the differences during all factors were compared. The study provides some decision basis for sustainable utilization and management of land resources in Qinghai Lake Area.展开更多
[Objective] The aim was to study the characteristics of climate changes in the surrounding area of Qinghai Lake.[Method] Based on the data of temperature,precipitation and sunshine hours from 5 representative meteorol...[Objective] The aim was to study the characteristics of climate changes in the surrounding area of Qinghai Lake.[Method] Based on the data of temperature,precipitation and sunshine hours from 5 representative meteorological stations in the surrounding area of Qinghai Lake during 1961-2007,the annual,seasonal and decadal variation of meteorological factors were analyzed.[Result] In recent 47 years,temperature showed obvious increase trend in the surrounding area of Qinghai Lake,and annual average temperature increased with the climatic tendency of ≥0.30 ℃/10 a,while annual average minimum temperature increased more significant than annual average temperature and annual average maximum temperature;annual mean precipitation decreased with the climatic tendency of-3.67 mm/10 a,and precipitation in spring and autumn reduced obviously,while precipitation in summer and winter increased slightly;annual sunshine hours also showed decrease trend with the climatic tendency of-1.79 h/10 a,while sunshine hours decreased most obviously in summer,and next came winter,while there was no obvious decrease in spring and autumn.[Conclusion] The study could provide theoretical references for the effective prevention of meteorological disasters in the surrounding area of Qinghai Lake.展开更多
[Objective] The research aimed to study the resistance of four kinds of desert plants in Qinhai Lake area.[Method] By contrasting the resistance indexes of four kinds of plants which included Ephedra intermedia,Stelle...[Objective] The research aimed to study the resistance of four kinds of desert plants in Qinhai Lake area.[Method] By contrasting the resistance indexes of four kinds of plants which included Ephedra intermedia,Stellera chamaejasme,Achnatherum splendens and Xanthopappus subacaulis,the resistance of four kinds of plants in Qinghai Lake area was analyzed.The resistance indexes included the soluble protein,MDA,free Pro content and the activities of SOD,POD,CAT.Moreover,the resistance of four kinds of plants was evaluated comprehensively by using Fuzzy membership function method.[Result] Under the low-temperature and arid adversity in Qinghai Lake area,SOD activity presented as Stellera chamaejasme>Xanthopappus subacaulis>Ephedra intermedia>Achnatherum splendens,and CAT activity presented as Stellera chamaejasme>Xanthopappus subacaulis>Achnatherum splendens>Ephedra intermedia.Under the same high-salt environment,CAT activity of Stellera chamaejasme was eight times higher than that of Ephedra intermedia.It illustrated that the salt resistance of Stellera chamaejasme was stronger than that of Ephedra intermedia.The free Pro content showed as Xanthopappus subacaulis>Ephedra intermedia>Stellera chamaejasme>Achnatherum splendens.Under the same adversity,Pro content of Ephedra intermedia was 2.83 times of Stellera chamaejasme.It was because that MDA content in Stellera chamaejasme was the lowest,and the membranous peroxide harm was the smallest.It caused that Pro content (stress penetration material) was low.It also illustrated that the resistance of Stellera chamaejasme was stronger than that of Ephedra intermedia.The comprehensive evaluation of Fuzzy membership function showed that the resistance presented as Xanthopappus subacaulis>Stellera chamaejasme>Ephedra intermedia>Achnatherum splendens.[Conclusion] The research provided the theory basis for the breeding of drought-resistance new variety and the development of good germ plasm resource in Qinghai Lake area.展开更多
Qinghai Lake is located in the northeastern Qinghai Xizang(Tibet) Plateau. It is an especially big light saltwater lake. The mire meadow in Qinghai Lake drainage area is an eco system which is affected by the eco ...Qinghai Lake is located in the northeastern Qinghai Xizang(Tibet) Plateau. It is an especially big light saltwater lake. The mire meadow in Qinghai Lake drainage area is an eco system which is affected by the eco environment factors. Its formation, development and temporal and spatial distribution law are decided by a few main meteorological factors in the eco environment to a certain extent. The main meteorological factors are ≥10℃ accumulated temperature, precipitation from May to September and annual humidity coefficient. The mathematical model of the mire wetland rate and the main meteorological factors is given by multivariate linear regression in the paper.展开更多
Desertification is one of the most serious eco-environmental problems around Qinghai Lake.Based on GIS and RS,GIS analysis was used to obtain the information of spatial-temporal change and different pattern of deserti...Desertification is one of the most serious eco-environmental problems around Qinghai Lake.Based on GIS and RS,GIS analysis was used to obtain the information of spatial-temporal change and different pattern of desertification in each county around Qinghai Lake in four phases of1976,1987,1995 and 2006.Using the function of intersect and overlay supported by ARCGIS,with analyzing attributes of vector RS images,we obtained transition data and established transfer matrix of land-use types in recent 30 years,besides,protracted land-use transition maps of all desertification classes.In further,we analyzed transition quantity and direction of desertification in each county,moreover,reconstructed the process of spatial-temporal evolution of desertification.The results are showed below:(1)it's the transition between desertified land and others but not in the desertified that played the main role in Gangcha and Gonghe County,while the transfer between desertified lands were greater than that with other land-use types in Haiyan County.(2)Extremely severe desertified land mainly distributes in Ketu and Sand Islands that belongs to Haiyan County,and moderate desertified land in riversides of Gangcha County,also,the light desertification expanded too rapidly to become the most desertified land-use type in the surrounding of Qinghai Lake since 1976.(3)By using relative change rate of desertified land,the regional variability rank from top to toe was Gangcha,Haiyan and Gonghe.展开更多
以青海省三角城种羊场地区典型的芨芨草草原为研究对象,采用相邻格子样方法取样,应用方差/均值比率法、负二项参数(K);扩散系数(C);C ass ie指标(CA);丛生指标(I)和聚块性指标(m*/m)等指标,比较了青海湖地区围栏内、外芨芨草群落主要种...以青海省三角城种羊场地区典型的芨芨草草原为研究对象,采用相邻格子样方法取样,应用方差/均值比率法、负二项参数(K);扩散系数(C);C ass ie指标(CA);丛生指标(I)和聚块性指标(m*/m)等指标,比较了青海湖地区围栏内、外芨芨草群落主要种群的空间分布格局。结果表明,围栏内芨芨草群落优势种群的空间格局除多裂蒲公英为随机分布外,其余均为聚集分布;围栏外除西伯利亚蓼外,其余种群也全部为聚集分布,而且围栏外种群的聚集强度大于围栏内。物种的这种分布格局主要与物种本身的生态和生物学特性有关。展开更多
基金Supported by The Regional Sustainable Development of the Qing-TibetPlateau(2004)~~
文摘Using path analysis, correlation analysis, partial correlation analysis and system dynamics method to study the driving force of cultivated land in Qinghai Lake Area, and using gradually regression analysis to establish the driving force model of utilized change of cultivated land. Driving factors, action mechanism and process of utilized change of cultivated land were analyzed, and the differences during all factors were compared. The study provides some decision basis for sustainable utilization and management of land resources in Qinghai Lake Area.
基金Supported by National Key Technology R & D Program (2007BAC30B02)Science and Technology Key Project of Qinghai Province (2008-N-146)
文摘[Objective] The aim was to study the characteristics of climate changes in the surrounding area of Qinghai Lake.[Method] Based on the data of temperature,precipitation and sunshine hours from 5 representative meteorological stations in the surrounding area of Qinghai Lake during 1961-2007,the annual,seasonal and decadal variation of meteorological factors were analyzed.[Result] In recent 47 years,temperature showed obvious increase trend in the surrounding area of Qinghai Lake,and annual average temperature increased with the climatic tendency of ≥0.30 ℃/10 a,while annual average minimum temperature increased more significant than annual average temperature and annual average maximum temperature;annual mean precipitation decreased with the climatic tendency of-3.67 mm/10 a,and precipitation in spring and autumn reduced obviously,while precipitation in summer and winter increased slightly;annual sunshine hours also showed decrease trend with the climatic tendency of-1.79 h/10 a,while sunshine hours decreased most obviously in summer,and next came winter,while there was no obvious decrease in spring and autumn.[Conclusion] The study could provide theoretical references for the effective prevention of meteorological disasters in the surrounding area of Qinghai Lake.
基金Supported by Young Scientific Research Fund Item of Qinghai University (2009-QN-16)"Monitoring and Breeding Key Technology of Important Biological Species Resource in China and Its Application Demonstration " of National Science and Technology Support Item (2008BAC39B04)
文摘[Objective] The research aimed to study the resistance of four kinds of desert plants in Qinhai Lake area.[Method] By contrasting the resistance indexes of four kinds of plants which included Ephedra intermedia,Stellera chamaejasme,Achnatherum splendens and Xanthopappus subacaulis,the resistance of four kinds of plants in Qinghai Lake area was analyzed.The resistance indexes included the soluble protein,MDA,free Pro content and the activities of SOD,POD,CAT.Moreover,the resistance of four kinds of plants was evaluated comprehensively by using Fuzzy membership function method.[Result] Under the low-temperature and arid adversity in Qinghai Lake area,SOD activity presented as Stellera chamaejasme>Xanthopappus subacaulis>Ephedra intermedia>Achnatherum splendens,and CAT activity presented as Stellera chamaejasme>Xanthopappus subacaulis>Achnatherum splendens>Ephedra intermedia.Under the same high-salt environment,CAT activity of Stellera chamaejasme was eight times higher than that of Ephedra intermedia.It illustrated that the salt resistance of Stellera chamaejasme was stronger than that of Ephedra intermedia.The free Pro content showed as Xanthopappus subacaulis>Ephedra intermedia>Stellera chamaejasme>Achnatherum splendens.Under the same adversity,Pro content of Ephedra intermedia was 2.83 times of Stellera chamaejasme.It was because that MDA content in Stellera chamaejasme was the lowest,and the membranous peroxide harm was the smallest.It caused that Pro content (stress penetration material) was low.It also illustrated that the resistance of Stellera chamaejasme was stronger than that of Ephedra intermedia.The comprehensive evaluation of Fuzzy membership function showed that the resistance presented as Xanthopappus subacaulis>Stellera chamaejasme>Ephedra intermedia>Achnatherum splendens.[Conclusion] The research provided the theory basis for the breeding of drought-resistance new variety and the development of good germ plasm resource in Qinghai Lake area.
文摘Qinghai Lake is located in the northeastern Qinghai Xizang(Tibet) Plateau. It is an especially big light saltwater lake. The mire meadow in Qinghai Lake drainage area is an eco system which is affected by the eco environment factors. Its formation, development and temporal and spatial distribution law are decided by a few main meteorological factors in the eco environment to a certain extent. The main meteorological factors are ≥10℃ accumulated temperature, precipitation from May to September and annual humidity coefficient. The mathematical model of the mire wetland rate and the main meteorological factors is given by multivariate linear regression in the paper.
基金National Key Technology R&D Program of China(2007BAC30B03)"The Fundamental Research Funds for the Central Universities"and"Forestry Industry Research Special Funds for Public Welfare"(201004025)
文摘Desertification is one of the most serious eco-environmental problems around Qinghai Lake.Based on GIS and RS,GIS analysis was used to obtain the information of spatial-temporal change and different pattern of desertification in each county around Qinghai Lake in four phases of1976,1987,1995 and 2006.Using the function of intersect and overlay supported by ARCGIS,with analyzing attributes of vector RS images,we obtained transition data and established transfer matrix of land-use types in recent 30 years,besides,protracted land-use transition maps of all desertification classes.In further,we analyzed transition quantity and direction of desertification in each county,moreover,reconstructed the process of spatial-temporal evolution of desertification.The results are showed below:(1)it's the transition between desertified land and others but not in the desertified that played the main role in Gangcha and Gonghe County,while the transfer between desertified lands were greater than that with other land-use types in Haiyan County.(2)Extremely severe desertified land mainly distributes in Ketu and Sand Islands that belongs to Haiyan County,and moderate desertified land in riversides of Gangcha County,also,the light desertification expanded too rapidly to become the most desertified land-use type in the surrounding of Qinghai Lake since 1976.(3)By using relative change rate of desertified land,the regional variability rank from top to toe was Gangcha,Haiyan and Gonghe.
文摘以青海省三角城种羊场地区典型的芨芨草草原为研究对象,采用相邻格子样方法取样,应用方差/均值比率法、负二项参数(K);扩散系数(C);C ass ie指标(CA);丛生指标(I)和聚块性指标(m*/m)等指标,比较了青海湖地区围栏内、外芨芨草群落主要种群的空间分布格局。结果表明,围栏内芨芨草群落优势种群的空间格局除多裂蒲公英为随机分布外,其余均为聚集分布;围栏外除西伯利亚蓼外,其余种群也全部为聚集分布,而且围栏外种群的聚集强度大于围栏内。物种的这种分布格局主要与物种本身的生态和生物学特性有关。
