Amiri B J,Nakane K,2008.Entire catchment and buffer zone approaches to modeling linkage between river water quality and land cover-A case study of Yamaguchi Prefecture,Japan.Chinese Geographical Science,18(1):85-92.DOI:10.1007/s11769-008-0085-6
 Apezteguäa H P,Izaurralde R C,Sereno R,2009.Simulation study of soil organic matter dynamics as affected by land use and agricultural practices in semiarid Cordoba,Argentina.Soil & Tillage Research,102(1):101-108.DOI:10.1016/j.still.2008.07.016
 Bärlund I,Kirkkala T,Malve O,Kämäri J,2007.Assessing SWAT model performance in the evaluation of management actions for the implementation of the water framework directive.Environmental Modelling & Software,22(5):719-724.DOI:10.1016/j.envsoft.2005.12.030
 Behera S,Panda R K,2006.Evaluation of management alternatives for an agricultural watershed in a sub-humid subtropical region using a physical process based model.Agriculture,Ecosystems & Environment,113(1-4):62-72.DOI:10.1016/j.agee.2005.08.032
 Beyene A,Addis T,Kifle D et al.,2009.Comparative study of diatoms and macroinvertebrates as indicators of severe water pollution:Case study of the Kebena and Akaki rivers in Addis Ababa,Ethiopia.Ecological Indicators,9(2):381-392.DOI:10.1016/j.ecolind.2008.05.001
 Bouraoui F,Grizzetti B,Granlund K et al.,2004.Impact of climate change on the water cycle and nutrient losses in a finnish catchment.Climatic Change,66(1-2):109-126.DOI:10.1023/B:CLIM.0000043147.09365.e3
 Budhendra B,Jon H,Bernie E et al.,2003.Assessing watershed-scale,long-term hydrologic impacts of land-use change using a GIS-NPS model.Environmental Management,26(6):643-658.DOI:10.1007/s002670010122
 Cao Y,Williams D D,Williams N E,1999.Data transformation and standardization in the multivariate analysis of a river water quality.Ecology Application,9(2):669-677.
 de Jonge Victor N,Elliot M,Orive E,2002.Causes,historical development,effects and future challenges of a common environmental problem:Eutrophication.Hydrobilolgia,475-476(1):1-19.DOI:10.1023/A:1020366418295
 Gao Chao,Zhu Jiye,Zhu Jianguo et al.,2005.Effects of extreme rainfall on the export of nutrients from agricultural land.Acta Geographica Sinica,60(6):991-997.(in Chinese)
 Gikas G D,Yiannakopoulou T,Tsihrintzis V A,2006.Modeling of non-point source pollution in a Mediterranean drainage basin.Environmental Modeling and Assessment,11(3):219-233.DOI:10.1007/s10666-005-9017-3
 Huang Xiangfei,Chen Weimin,Cai Qiming et al.,1999.Survey,observation and analysis of lake ecology.Beijing:Standards Press of China.(in Chinese)
 Johnson L B,Gage S H,1997.Landscape approaches to the analysis of aquatic ecosystems.Freshwater Biology,37(1):113-132.
 Jongman R H G,ter Braak C J F,van Tongeren O F R,1995.Data Analysis in Community and Landscape Ecology.Cambridge:Cambridge University Press.
 Kennish M J,2002.Environmental threats and environmental future of estuaries.Environmental Conservation,29(1):78-107.DOI:10.1017/S0376892902000061
 Li S,Liu W,Gu S et al.,2009.Spatio-temporal dynamics of nutrients in the upper Han River basin,China.Journal of Hazardous Material,162(2-3):1340-1346.DOI:10.1016/j.jhazmat.2008.06.059
 Li S,Zhang Q,2008.Geochemistry of the upper Han River basin,China,1:Spatial distribution of major ion compositions and their controlling factors.Applied Geochemistry,23(12):3535-3544.DOI:10.1016/j.apgeochem.2008.08.012
 Li Yan,Li Hengpeng,2008.Influence of landscape characteristics on non-point source pollutant output in Taihu upper-river basin.Environmental Science,29(5):1319-1324.(in Chinese)
 Lian Gang,Wang Dejian,2004.Nitrogen leaching in wheat growing season in Taihu Lake area.Journal of Soil Science,35(2):163-165.(in Chinese)
 Liu Renyan,Feng Minglei,Lin Shan,2008.Nitrate concentration in water in small watersheds of three Gorges reservoir area and its relationship with land-use.Journal of Natural resources,23(5):886-892.(in Chinese)
 Munodawafa A,2007.Assessing nutrient losses with soil erosion under different tillage systems and their implications on water quality.Physics and Chemistry of the Earth,32(15-18):135-1140.DOI:10.1016/j.pce.2007.07.033
 Narunalani S,Zhou Y,Jensen J R,1997.Application of remote sensing and geographic information systems to the delineation and analysis of riparian buffer zone.Aquatic Botany,58(3-4):393-W9.DOI:10.1016/S0304-3770(97)00048-X
 Ning S K,Chang N B,Jeng K Y et al.,2006.Soil erosion and non-point source pollution impacts assessment with the aid of multi-temporal remote sensing images.Journal of Environmental Management,79(1):88-101.DOI:10.1016/j.jenvman.2005.05.019
 Oki K,Yasuoka Y,2008.Mapping the potential annual total nitrogen load in the river basins of Japan with remotely sensed imagery.Remote Sensing of Environment,112(6):3091-3098.DOI:10.1016/j.rse.2008.03.006
 Ouyang W,Hao F H,Wang X L,2008.Nonpoint source pollution responses simulation for conversion cropland to forest in mountains by SWAT in China.Enivironmental Management,41(1):79-89.DOI:10.1007/s00267-007-9028-8
 Polyakov V,Fares A,Kubo D et al.,2007.Evaluation of a nonpoint source pollution model,AnnAGNPS,in a tropical watershed.Environmental Modelling & Software,22(11):1617-1627.DOI:10.1016/j.envsoft.2006.12.001
 Prasad V K,Ortiz A,Stinner B et al.,2005.Exploring the relationship between hydrologic parameters and nutrient loads using digital elevation model and GIS-A case study from sugarcreek headwaters,Ohio,U.S.A.Environmental Monitoring and Assessment,110(1-3):141-169.DOI:10.1007/sl0661-005-66-88-9
 SEPAC(State Environmental Protection Administration of China),2002.Water and Wastewater Monitoring Analysis Methods.4th edition.Beijing:China Environmental Science Press.(in Chinese)
 Shrestha S,Kazama F,Newham L T H et al.,2008.Catchment scale modeling of point source and non-point source pollution loads using pollutant export coefficients determined from longtem in-stream monitoring data.Journal of Hydro-environment Research,2(3):134-147.DOI:10.1016/j.jher.2008.05.002
 Sliva L,Williams D D,2001.Buffer zone versus whole catchment approaches to studying land use impact on river water quality.Water Resource,35(14):3462-3472.DOI:10.1016/S0-043-1354(01)00062-8
 Suo Anning,Wang Xizhi,Hu Yuzhe et al.,2006.DCCA order applied in environment explaining of watershed runoff on Loess Plateau.Scienta Geographica Snica,26(2):205-210.(in Chinese)
 ter Braak C J F,1989.CANOCO-An extension of DECORANA to analyze species-environment relationships.Hydrobiologia,184(3):169-170.DOI:10.1007/BF00027025
 ter Braak C J F,Smilauer P,2002.Canoco Reference Manual and CanocoDraw for Windows User's Guide:Software for Canonical Community Ordination(Version 4.5).New York:Microcomputer Power.
 USEPA(U.S.Environmental Protection Agency),2000.National Water Quality Inventory:2000.http://www.epa.gov/305b/2000 report/
 Velasco J,Lloret J,Millan A et al.,2006.Nutrient and particulate inputs into the Mar Menor lagoon from an intensive agricultural watershed.Water,Air,& Soil Pollution,176(1-4):37-56.DOI:10.1007/s11270-006-2859-8
 Wang J L,Yang Y S,2008.An approach to catchment-scale groundwater nitrate risk assessment from diffuse agricultural sources.Hydrol.Process.,22,4274-4286.
 Wei Huibin,Zhang Zhanpang,Yang Jinpeng,2007.Establishing method for soil database of SWAT model.Water Resource and Hydropower Engineering,38(6):15-18.(in Chinese)