Northern foot of the Qinling Mountains(Xi'an Section) is a transitional section between the Qinling Mountains and Xi'an City, so it has great ecological signifi cance. On the basis of sorting out landscape cit...Northern foot of the Qinling Mountains(Xi'an Section) is a transitional section between the Qinling Mountains and Xi'an City, so it has great ecological signifi cance. On the basis of sorting out landscape city, space structuring of the northern foot of the Qinling Mountains was studied within the theoretical framework of landscape city, it was disclosed that northern foot of the Qinling Mountains was a signifi cant ecological screen for the landscape city spatial pattern of Xi'an, and an important carrier for its "mountain, water and city" cultures. Then, fi ve infl uence factors for the space structuring of the study area were given, and basic contents of the space structuring analyzed from fi ve perspectives of spatial structure, spatial form, ecological environment, integration of regional spaces, historical and cultural context, so as to explore ecological conservation and moderate utilization of the northern foot of the Qinling Mountains from the perspective of space structuring.展开更多
In the Qinling orogenic belt. oceanic crust originated in the Early Palaeozoic. while the product of conti-nental collision appeared as late as after the Triassic. The Late Palaeozoic records there are of major impor-...In the Qinling orogenic belt. oceanic crust originated in the Early Palaeozoic. while the product of conti-nental collision appeared as late as after the Triassic. The Late Palaeozoic records there are of major impor-tance for understanding the tectonic regime at that time. The Carboniferous and even Permian sequences andthe distribution of sedimentary facies in northern Huaiyang indicate that the rocks were formed in a large basinopening towards the south. Regional stratigraphic correlation shows that the interior of the Qinling orogenicbelt was a sea trough lying between the Yangtze and North China plates in the middle part of the LatePalaeozoic. With subsequent northward migration of the South China Sea, the two seas were connected witheach other. Both the melanges and the Dabie block ia the eastern sector of the Qinling belt were formed in theMesozoic ?.展开更多
Eco-migrants'ability to adapt to livelihood risks and their satisfaction with lives directly affect the ecological and economic benefits of ecological migration engineering.To formulate an effective livelihood ris...Eco-migrants'ability to adapt to livelihood risks and their satisfaction with lives directly affect the ecological and economic benefits of ecological migration engineering.To formulate an effective livelihood risk prevention system and welfare guarantee mechanism,we took the ecomigrants in Wuwei City as an example,developed an integrated analytical framework for life satisfaction and employed linear regression models to identify the interactions between livelihood risk and life satisfaction.Our findings indicate that 94.66%of eco-migrants in Wuwei City are threatened by livelihood risks after relocation.High living expenses,poor quality of redistributed production goods,and re-poverty constitute the main risks.The risk multiplicity index is 2.96.Besides cultural types,there are no significant differences in regions and livelihoods.A total of 55.73%of eco-migrants are satisfied with their lives,with the Liangzhou district scoring the highest.Except for satisfaction with development potential and public services,no significant intergroup differences were found among regions and livelihood patterns.Eco-migrant's life satisfaction is significantly affected by livelihood risks.Eco-migrants'satisfaction with living income,social integration,farmer-friendly policies and overall life is negatively affected by the risk of repoverty and inadequate social security.An ecomigrant's satisfaction with development potential and community construction is not influenced by one type of risk alone,but the interaction between risks has a strong influence.The interaction of welfare risks with economic risks and policy risks will balance and weaken the adverse effects of a single risk on those elements in the economic and policy spheres.This study offers novel ideas for rural revitalization,hollow governance,and well-being assurance.展开更多
Eclogite pebbles are first discovered in late Jurassic conglomerates of the Fenghuangtai Formation from the northern foot of the Dabie Mountains, eastern China. The eclogite shows relatively strong retrograde metamor-...Eclogite pebbles are first discovered in late Jurassic conglomerates of the Fenghuangtai Formation from the northern foot of the Dabie Mountains, eastern China. The eclogite shows relatively strong retrograde metamor-phism. The major remnant minerals are garnet, phengite, quartz, rutile, clinozoisite, fingerprint(or worm)-form sym-plectite and pseudomorphic enclosure of coesite in garnet. End-member components of the garnet mainly made up of grossular (27.7%-37.8%), almandinc (45.5%-49.0%) and pyrope (12.3%-25.7%). End-member components of the pyrope is less than 30%, i.e. equivalent to C type eclogite. Si-cations of the phengite are 3.44-3.54 p.f.u. (taking O=11as standard). It is estimated that the pressures are 2.5-3.2 GPa, the temperatures are 600-900℃. Discovery of the eclogite pebbles in the late Jurassic conglomerates from the northern foot of the Dabie Mountains suggests that the HP-UHP metamorphic rocks of the Dabie Mountains, which were formed in Triassic, had been exposed to the surface in展开更多
It is beheved that the Shujiaba Formation belongs to a series of thick turbidites. 20 ichnogenera have been found in the formation, of which 14 genera were found in the Devonian System of China for the first time The ...It is beheved that the Shujiaba Formation belongs to a series of thick turbidites. 20 ichnogenera have been found in the formation, of which 14 genera were found in the Devonian System of China for the first time The ichnogenera are mostly of typical deep-water ones and belong to the Nereites ichnofacies A detailed study of morphology and behaviour of the trace fossils indicates that the Shujiaba Formation was deposited in a bathyal-abyssal environment.展开更多
IN recent years more and more attention has been paid to the Devonian of the northern belt of Western Qinling because some large-scale or very large-scale fine-disseminated gold ores have been found. Accordingly, the ...IN recent years more and more attention has been paid to the Devonian of the northern belt of Western Qinling because some large-scale or very large-scale fine-disseminated gold ores have been found. Accordingly, the paleogeographical environments of the Devonian have become a very important project of concern to sedimentologists. Presently there are two kinds of different opinions on the Devonian sedimentary environments. In the first opinon they were consid-展开更多
秦岭北麓地区地势复杂、气候多变,生态环境丰富多样,是中国独特的生态宝库之一。而随着经济发展和人口增加,其生态环境也面临着严峻的挑战,保护其生态环境已成为当前亟待解决的问题。为此,该研究提出了一种结合“驱动力-压力-状态-影响...秦岭北麓地区地势复杂、气候多变,生态环境丰富多样,是中国独特的生态宝库之一。而随着经济发展和人口增加,其生态环境也面临着严峻的挑战,保护其生态环境已成为当前亟待解决的问题。为此,该研究提出了一种结合“驱动力-压力-状态-影响-响应-管理”(driving-force-pressure-state-impact-response-management,DPSIRM)和斑块生成土地利用变化模拟(patch-generating land use simulation,PLUS)模型来评价秦岭北麓生态环境的方法。首先,基于DPSIRM模型,选取了17个指标对2010、2015、2020年的秦岭北麓生态环境状况进行生态敏感性评价,其次在此基础上运用PLUS模型预测不同情景下2020–2030年秦岭北麓土地利用空间布局情况,最后利用预测的土地利用类型数据作为影响生态环境的因子,预测研究区的生态敏感性空间分布特征。结果表明:秦岭北麓生态敏感区主要分布在中心城区周围,距城区越远,抗干扰能力越强;2010–2020年非敏感性区域逐步增多,从9%增加到了26%,2010年低敏感区占比最多(38%),2015年中敏感区占比最多(28%),2020年低敏感区占比最多(30%),极高敏感区整体占比不高且相差不大(5%~10%),表明随着时间的变化研究区生态环境已得到初步改善且总体状态向好发展;2020–2030年3种不同情景下土地利用类型主要以耕地、林地、草地为主,模拟预测发现以生态保护为前提的保护与开发是较为适应当前可持续发展战略的情景。研究结果可为研究区生态环境保护和可持续土地利用提供科学依据。展开更多
基金Sponsored by Humanities and Social Science Research Program of Henan Provincial Department of Education(2013GH-141,2014-GH-208)
文摘Northern foot of the Qinling Mountains(Xi'an Section) is a transitional section between the Qinling Mountains and Xi'an City, so it has great ecological signifi cance. On the basis of sorting out landscape city, space structuring of the northern foot of the Qinling Mountains was studied within the theoretical framework of landscape city, it was disclosed that northern foot of the Qinling Mountains was a signifi cant ecological screen for the landscape city spatial pattern of Xi'an, and an important carrier for its "mountain, water and city" cultures. Then, fi ve infl uence factors for the space structuring of the study area were given, and basic contents of the space structuring analyzed from fi ve perspectives of spatial structure, spatial form, ecological environment, integration of regional spaces, historical and cultural context, so as to explore ecological conservation and moderate utilization of the northern foot of the Qinling Mountains from the perspective of space structuring.
基金This reseurch is Project 4860140 supported by the National Natural Science Foundation of China.
文摘In the Qinling orogenic belt. oceanic crust originated in the Early Palaeozoic. while the product of conti-nental collision appeared as late as after the Triassic. The Late Palaeozoic records there are of major impor-tance for understanding the tectonic regime at that time. The Carboniferous and even Permian sequences andthe distribution of sedimentary facies in northern Huaiyang indicate that the rocks were formed in a large basinopening towards the south. Regional stratigraphic correlation shows that the interior of the Qinling orogenicbelt was a sea trough lying between the Yangtze and North China plates in the middle part of the LatePalaeozoic. With subsequent northward migration of the South China Sea, the two seas were connected witheach other. Both the melanges and the Dabie block ia the eastern sector of the Qinling belt were formed in theMesozoic ?.
基金financially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA20020401)The Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(2019QZKK0404)Foundation for Excellent Youth Scholars of“Northwest Institute of Eco-Environment and Resources”,CAS(Y851D71)。
文摘Eco-migrants'ability to adapt to livelihood risks and their satisfaction with lives directly affect the ecological and economic benefits of ecological migration engineering.To formulate an effective livelihood risk prevention system and welfare guarantee mechanism,we took the ecomigrants in Wuwei City as an example,developed an integrated analytical framework for life satisfaction and employed linear regression models to identify the interactions between livelihood risk and life satisfaction.Our findings indicate that 94.66%of eco-migrants in Wuwei City are threatened by livelihood risks after relocation.High living expenses,poor quality of redistributed production goods,and re-poverty constitute the main risks.The risk multiplicity index is 2.96.Besides cultural types,there are no significant differences in regions and livelihoods.A total of 55.73%of eco-migrants are satisfied with their lives,with the Liangzhou district scoring the highest.Except for satisfaction with development potential and public services,no significant intergroup differences were found among regions and livelihood patterns.Eco-migrant's life satisfaction is significantly affected by livelihood risks.Eco-migrants'satisfaction with living income,social integration,farmer-friendly policies and overall life is negatively affected by the risk of repoverty and inadequate social security.An ecomigrant's satisfaction with development potential and community construction is not influenced by one type of risk alone,but the interaction between risks has a strong influence.The interaction of welfare risks with economic risks and policy risks will balance and weaken the adverse effects of a single risk on those elements in the economic and policy spheres.This study offers novel ideas for rural revitalization,hollow governance,and well-being assurance.
基金This work was supported by a project (Grant No. KZ951-A1-401-07) of the Chinese Academy of Sciences.
文摘Eclogite pebbles are first discovered in late Jurassic conglomerates of the Fenghuangtai Formation from the northern foot of the Dabie Mountains, eastern China. The eclogite shows relatively strong retrograde metamor-phism. The major remnant minerals are garnet, phengite, quartz, rutile, clinozoisite, fingerprint(or worm)-form sym-plectite and pseudomorphic enclosure of coesite in garnet. End-member components of the garnet mainly made up of grossular (27.7%-37.8%), almandinc (45.5%-49.0%) and pyrope (12.3%-25.7%). End-member components of the pyrope is less than 30%, i.e. equivalent to C type eclogite. Si-cations of the phengite are 3.44-3.54 p.f.u. (taking O=11as standard). It is estimated that the pressures are 2.5-3.2 GPa, the temperatures are 600-900℃. Discovery of the eclogite pebbles in the late Jurassic conglomerates from the northern foot of the Dabie Mountains suggests that the HP-UHP metamorphic rocks of the Dabie Mountains, which were formed in Triassic, had been exposed to the surface in
基金Project supported by the National Natural Science Foundation of China.
文摘It is beheved that the Shujiaba Formation belongs to a series of thick turbidites. 20 ichnogenera have been found in the formation, of which 14 genera were found in the Devonian System of China for the first time The ichnogenera are mostly of typical deep-water ones and belong to the Nereites ichnofacies A detailed study of morphology and behaviour of the trace fossils indicates that the Shujiaba Formation was deposited in a bathyal-abyssal environment.
文摘IN recent years more and more attention has been paid to the Devonian of the northern belt of Western Qinling because some large-scale or very large-scale fine-disseminated gold ores have been found. Accordingly, the paleogeographical environments of the Devonian have become a very important project of concern to sedimentologists. Presently there are two kinds of different opinions on the Devonian sedimentary environments. In the first opinon they were consid-
文摘秦岭北麓地区地势复杂、气候多变,生态环境丰富多样,是中国独特的生态宝库之一。而随着经济发展和人口增加,其生态环境也面临着严峻的挑战,保护其生态环境已成为当前亟待解决的问题。为此,该研究提出了一种结合“驱动力-压力-状态-影响-响应-管理”(driving-force-pressure-state-impact-response-management,DPSIRM)和斑块生成土地利用变化模拟(patch-generating land use simulation,PLUS)模型来评价秦岭北麓生态环境的方法。首先,基于DPSIRM模型,选取了17个指标对2010、2015、2020年的秦岭北麓生态环境状况进行生态敏感性评价,其次在此基础上运用PLUS模型预测不同情景下2020–2030年秦岭北麓土地利用空间布局情况,最后利用预测的土地利用类型数据作为影响生态环境的因子,预测研究区的生态敏感性空间分布特征。结果表明:秦岭北麓生态敏感区主要分布在中心城区周围,距城区越远,抗干扰能力越强;2010–2020年非敏感性区域逐步增多,从9%增加到了26%,2010年低敏感区占比最多(38%),2015年中敏感区占比最多(28%),2020年低敏感区占比最多(30%),极高敏感区整体占比不高且相差不大(5%~10%),表明随着时间的变化研究区生态环境已得到初步改善且总体状态向好发展;2020–2030年3种不同情景下土地利用类型主要以耕地、林地、草地为主,模拟预测发现以生态保护为前提的保护与开发是较为适应当前可持续发展战略的情景。研究结果可为研究区生态环境保护和可持续土地利用提供科学依据。
