This paper took Chishui River Basin as the research object,and pointed out that its culture,which reflected local life and production and was featured with regional characteristics as well as abundant cultural connota...This paper took Chishui River Basin as the research object,and pointed out that its culture,which reflected local life and production and was featured with regional characteristics as well as abundant cultural connotation,was constituted by native natural and cultural geography,folk customs and historical feature.The relation between Chishui salt path and salt business culture under the typical closed and half-closed geographical environment was analyzed to indicate that the realignment of Chishui River had brought prosperity of Chishui River,booming of commercial towns,and development of ancient architectures and guild hall culture.The relation between rich natural resources and production and life culture of Chishui River was explained to show that Danxia landform nurtured stone culture,Chishui River resources cultivated fishing culture,special hydrogeological environment fostered liquor culture represented by Maotai,and Bamboo culture accumulated for hundreds of years.Finally,it introduced military culture and the spirit of the Long March forming based on the special location of Chishui River.It emphasized that geological environment was the important basis for human's survival and played an immeasurable role in the cultural development of a region.展开更多
Oil-gas remote sensing information is obtained from satellite TM data through graph-ic treatment in the light of the hydrocarbon-microseepage theory. The nine target areas (ofthree types) selected on this basis coinci...Oil-gas remote sensing information is obtained from satellite TM data through graph-ic treatment in the light of the hydrocarbon-microseepage theory. The nine target areas (ofthree types) selected on this basis coincide well with the occurrence of natural gases and have been proved by subsequent prospecting. Plants in the target areas are characterized, as a result of hydrocarbon- microseepage, by abnormal spectral features with the absorption peaks of chlorophyll shifting toward blue light, reflectivity in the range of visible light increasing and re-flectivity in the near infrared region decreasing.展开更多
基于赤水河水文站1970—2021年径流系列资料,采用Spearman秩次相关检验、Mann-Kendall检验、有序聚类分析等方法对赤水河径流特性及趋势进行分析研究,以期为赤水河流域水资源的科学管理、开发利用、生态环境保护等提供参考。研究结果显...基于赤水河水文站1970—2021年径流系列资料,采用Spearman秩次相关检验、Mann-Kendall检验、有序聚类分析等方法对赤水河径流特性及趋势进行分析研究,以期为赤水河流域水资源的科学管理、开发利用、生态环境保护等提供参考。研究结果显示,赤水河年、汛期和枯水期径流均呈现不同程度的不显著减少趋势。根据MannKendall检验及有序聚类分析,2000年为赤水河流域年径流减少的突变点,2002年为汛期径流减少的突变点,1992年为枯水期径流减少的突变点。从小波分析结果看,赤水河年径流主要有56、42、31 a 3种时间尺度震荡周期;汛期径流主要有56、41、31 a 3种时间尺度震荡周期;枯水期径流主要存在55、44、10~12 a 3种时间尺度震荡周期。展开更多
河流具有独特且复杂的树枝状等级性网络拓扑结构,使得河流连通性和生境异质性在不同河网位置上存在明显差异。长期以来,河流生态系统通常被视为局部或线性结构进行研究,忽略了河网位置对群落构建等生态过程的影响。本研究以具有复杂网...河流具有独特且复杂的树枝状等级性网络拓扑结构,使得河流连通性和生境异质性在不同河网位置上存在明显差异。长期以来,河流生态系统通常被视为局部或线性结构进行研究,忽略了河网位置对群落构建等生态过程的影响。本研究以具有复杂网络结构和自然流态的赤水河为研究区域,探索了河流网络位置对底栖动物α、β多样性和群落构建过程的影响。其中,α多样性使用物种数、Shannon-Wiener多样性、Simpson多样性和Pielou均匀度指数来度量;β多样性使用SΦrensen相异性指数(β_(sФr))和Bray-Curtis相异性指数(d_(BC))来表征,并将其分割为置换和嵌套两种组分;群落构建过程采用冗余分析和变差分解来实现。结果显示:1)赤水河全流域底栖动物群落主要受环境过滤驱动;2)河流网络位置塑造着赤水河底栖动物的多样性格局和群落构建过程。河网中心的干流底栖动物群落主要受环境过滤的影响,而河网边缘的支流底栖动物群落则受到空间限制和环境过滤的共同作用,该发现质疑了河流网络位置假说(network position hypothesis,NPH)在赤水河流域的适用性;支流的α多样性明显高于干流,而干流的β多样性则显著高于支流;β多样性主要由置换组分构成,这表明尽可能多地保护不同位点和生境是维持底栖动物物种多样性的重要举措。本研究有助于深入理解复杂河网影响下底栖动物的物种共存和维持机制,为提出适用于我国亚热带季风区河网的新假说提供视角,为长江上游水生生物保护区选址和设计提供参考和依据。展开更多
Background To rehabilitate the depleted fish resources of the Yangtze River Basin,China,a 10-year fishing ban has been implemented.This national initiative has attracted worldwide attention.The present study aimed to ...Background To rehabilitate the depleted fish resources of the Yangtze River Basin,China,a 10-year fishing ban has been implemented.This national initiative has attracted worldwide attention.The present study aimed to explore the ecological process and recovery effectiveness of this complete fishing ban in the Chishui River,the first river where the fishing ban was enacted in the Yangtze River Basin.Changes in fish resources were analyzed based on investigations conducted 5 years before(2012–2016)and 5 years after(2017–2021)the implementation of the fish-ing ban in four reaches along the longitudinal gradient.Results A total of 140 fish species,including 127 native and 13 exotic species,were collected during the study period.The number of fish species as well as the diversity indices showed no significant temporal changes.However,11 native species that had disappeared for many years appeared again after the fishing ban.The occurrence rates of some key protected species,Procypris rabaudi,Acipenser dabryanus,Euchiloglanis davidi and Myxocyprinus asiaticus,increased after the fishing ban,while Coreius guichenoti,Percocypris pingi,Onychostoma angustistomata and Leptobotia rubrilabris showed no obvious recovery.The fish assemblage structure in nearly all reaches(except the headwater)showed significant temporal changes with an increase in the relative abundance of larger body-sized species.The population structure of most dominant species improved greatly with the mean standard length and the mean body weight as well as the proportion of larger-sized individuals clearly increasing.In addition,the density of fishes changed dramatically with the catch per unit effort(CPUE)increasing by 140–210%for different study reaches.Conclusions The present study confirmed that the complete fishing closure is an effective measure to facilitate fish resources recovery.These results provide valuable references for evaluating the effectiveness of the 10-year fishing ban policy in the entire Yangtze River.展开更多
基金Supported by " Research on Tourism Development and Traditiona Cultural Protection of Chishui Danxia as World Natural Heritage "Which Is Foundation Item of Guizhou Provincial Governor (2010013)" Economic Development and Eco-environment Change of Chishu River Basin in Qing Dynasty" Which Is Regional Economic Research Subject of Zunyi Normal College (E03.2010)~~
文摘This paper took Chishui River Basin as the research object,and pointed out that its culture,which reflected local life and production and was featured with regional characteristics as well as abundant cultural connotation,was constituted by native natural and cultural geography,folk customs and historical feature.The relation between Chishui salt path and salt business culture under the typical closed and half-closed geographical environment was analyzed to indicate that the realignment of Chishui River had brought prosperity of Chishui River,booming of commercial towns,and development of ancient architectures and guild hall culture.The relation between rich natural resources and production and life culture of Chishui River was explained to show that Danxia landform nurtured stone culture,Chishui River resources cultivated fishing culture,special hydrogeological environment fostered liquor culture represented by Maotai,and Bamboo culture accumulated for hundreds of years.Finally,it introduced military culture and the spirit of the Long March forming based on the special location of Chishui River.It emphasized that geological environment was the important basis for human's survival and played an immeasurable role in the cultural development of a region.
文摘Oil-gas remote sensing information is obtained from satellite TM data through graph-ic treatment in the light of the hydrocarbon-microseepage theory. The nine target areas (ofthree types) selected on this basis coincide well with the occurrence of natural gases and have been proved by subsequent prospecting. Plants in the target areas are characterized, as a result of hydrocarbon- microseepage, by abnormal spectral features with the absorption peaks of chlorophyll shifting toward blue light, reflectivity in the range of visible light increasing and re-flectivity in the near infrared region decreasing.
文摘基于赤水河水文站1970—2021年径流系列资料,采用Spearman秩次相关检验、Mann-Kendall检验、有序聚类分析等方法对赤水河径流特性及趋势进行分析研究,以期为赤水河流域水资源的科学管理、开发利用、生态环境保护等提供参考。研究结果显示,赤水河年、汛期和枯水期径流均呈现不同程度的不显著减少趋势。根据MannKendall检验及有序聚类分析,2000年为赤水河流域年径流减少的突变点,2002年为汛期径流减少的突变点,1992年为枯水期径流减少的突变点。从小波分析结果看,赤水河年径流主要有56、42、31 a 3种时间尺度震荡周期;汛期径流主要有56、41、31 a 3种时间尺度震荡周期;枯水期径流主要存在55、44、10~12 a 3种时间尺度震荡周期。
文摘河流具有独特且复杂的树枝状等级性网络拓扑结构,使得河流连通性和生境异质性在不同河网位置上存在明显差异。长期以来,河流生态系统通常被视为局部或线性结构进行研究,忽略了河网位置对群落构建等生态过程的影响。本研究以具有复杂网络结构和自然流态的赤水河为研究区域,探索了河流网络位置对底栖动物α、β多样性和群落构建过程的影响。其中,α多样性使用物种数、Shannon-Wiener多样性、Simpson多样性和Pielou均匀度指数来度量;β多样性使用SΦrensen相异性指数(β_(sФr))和Bray-Curtis相异性指数(d_(BC))来表征,并将其分割为置换和嵌套两种组分;群落构建过程采用冗余分析和变差分解来实现。结果显示:1)赤水河全流域底栖动物群落主要受环境过滤驱动;2)河流网络位置塑造着赤水河底栖动物的多样性格局和群落构建过程。河网中心的干流底栖动物群落主要受环境过滤的影响,而河网边缘的支流底栖动物群落则受到空间限制和环境过滤的共同作用,该发现质疑了河流网络位置假说(network position hypothesis,NPH)在赤水河流域的适用性;支流的α多样性明显高于干流,而干流的β多样性则显著高于支流;β多样性主要由置换组分构成,这表明尽可能多地保护不同位点和生境是维持底栖动物物种多样性的重要举措。本研究有助于深入理解复杂河网影响下底栖动物的物种共存和维持机制,为提出适用于我国亚热带季风区河网的新假说提供视角,为长江上游水生生物保护区选址和设计提供参考和依据。
基金supported by Grants from the National Key Research&Development Program of China(2022FY100400,2022YFB3206905)the National Key Research&Development Program of Yunnan Province(202203AC100001)the China Three Gorges Corporation(BHQ202305).
文摘Background To rehabilitate the depleted fish resources of the Yangtze River Basin,China,a 10-year fishing ban has been implemented.This national initiative has attracted worldwide attention.The present study aimed to explore the ecological process and recovery effectiveness of this complete fishing ban in the Chishui River,the first river where the fishing ban was enacted in the Yangtze River Basin.Changes in fish resources were analyzed based on investigations conducted 5 years before(2012–2016)and 5 years after(2017–2021)the implementation of the fish-ing ban in four reaches along the longitudinal gradient.Results A total of 140 fish species,including 127 native and 13 exotic species,were collected during the study period.The number of fish species as well as the diversity indices showed no significant temporal changes.However,11 native species that had disappeared for many years appeared again after the fishing ban.The occurrence rates of some key protected species,Procypris rabaudi,Acipenser dabryanus,Euchiloglanis davidi and Myxocyprinus asiaticus,increased after the fishing ban,while Coreius guichenoti,Percocypris pingi,Onychostoma angustistomata and Leptobotia rubrilabris showed no obvious recovery.The fish assemblage structure in nearly all reaches(except the headwater)showed significant temporal changes with an increase in the relative abundance of larger body-sized species.The population structure of most dominant species improved greatly with the mean standard length and the mean body weight as well as the proportion of larger-sized individuals clearly increasing.In addition,the density of fishes changed dramatically with the catch per unit effort(CPUE)increasing by 140–210%for different study reaches.Conclusions The present study confirmed that the complete fishing closure is an effective measure to facilitate fish resources recovery.These results provide valuable references for evaluating the effectiveness of the 10-year fishing ban policy in the entire Yangtze River.
