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《Acta Ecologica Sinica》 2010-21
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The landscape components threshold of stream water quality:a review

LIU Zhenhuan1,2,LI You2,PENG Jian1,2 1 Key Laboratory of Resources Remote Sensing & Digital Agriculture,Ministry of Agriculture,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China 2 Laboratory for Earth Surface Processes,Ministry of Education,College of Urban and Environmental Science,Peking University,Beijing 100871,China  
This review aims to provide the frontier information of relationship between landscape change and water quality in order to obtain more attention of domestic researchers in this field,and to make a theoretical foundation of the case study in the future. The negative impacts of land use/cover change on regional ecological environment quality have been widely discussed throughout the world and have generated many debates in numerous valuable researches. In addition,the impacts of landscape component on water quality have become the specifically research hot spot in the regional and larger scale. It is necessary and valuable to discuss the issue of landscape threshold for two important reasons. On the one hand,the research of landscape threshold of water quality is beneficial for the further research of land use/cover change impact on water quality at regional scale; on the other hand,it helps the researchers and government officials to understand the scientific bases of water quality management,land use planning and management. This paper summarized landscape components indicators and water quality indicators used to analyze the relationship between landscape change and stream water quality. The landscape components indicators,such as impervious surface area ( ISA) ,Vegetation index,and land use/cover categories components,are widely used to represent landscape component in watershed,which can effectively express urban land,agriculture land and forest land. The researchers usually prefer to use those indicators with physical meanings such as ISA and Normalized difference vegetation index ( NDVI). There are four kinds of indicators to represent stream water quality,which are physical indicators,chemistry indicators,biological and integrated chemical indicators and biological indicators.Chemical indicators are still the most popular indices because they could be obtained conveniently and economically. Meanwhile,those indicators which could indicate aquatic ecosystems conditions such as biological indicators,Index of Biological Integrity ( IBI) are also extensively used. The current researches of the relationship between landscape change and stream water quality focused on threshold value,however,at the regional and larger scale,the threshold varied greatly because of the geographical background differences of study areas. In the further study,the researches of landscape component threshold of degraded water quality should be enhanced from three aspects,( 1) the research scale,( 2) water quality indicators,and ( 3 ) the criterion of threshold. The application of landscape pattern indicators in landscape component threshold will promote the research about how landscape spatial pattern will influent stream water quality,which is the key issue in the field of water quality protection,water environment management and watershed land use planning at the regional and larger scale.
【Fund】: 农业部资源遥感与数字农业重点开放实验室开放课题项目;; 国家自然科学基金资助项目(40801066)
【CateGory Index】: X52
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