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| Effect of land use/cover changes on nitrogen and phosphorus losses via non-point source pathway in Xiangxi River Basin |
| Received:August 18, 2015 |
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| KeyWord:Xiangxi River basin;land use/cover change;non-point source;export coefficient;state and process value |
| Author Name | Affiliation | E-mail | | CUI Chao | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | LIU Shen | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | ZHAI Li-mei | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | zhailimei@caas.cn | | ZHANG Fu-lin | Institute of Plant Protection, Soil and Fertilizer Sciences, Hubei Academy of Agricultural Sciences, Wuhan 430064, China | | | LIU Hong-bin | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | LEI Qiu-liang | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | WU Shu-xia | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | HUA Ling-ling | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | ZHOU Ji-wen | Xingshan Soil and Fertilizer Station of Hubei Province, Yichang 443000, China | |
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| Abstract: |
| Land use changes greatly influence non-point source nitrogen and phosphorus outputs. Here, the effect of land use/cover changes on non-point source outputs of nitrogen and phosphorus was studied based on remote sensing images(Landsat TM/ETM) in 1990,2000 and 2010 using the methods of characteristics of landscape analysis, export coefficient model, and ArcGIS in the Xiangxi River basin(3150 km2). Land use/cover changes were relatively moderate from 1990 to 2000, but was severe from 2000 to 2010. The area that land uses had changed from one into another between 2000 to 2010 accounted for 4.3% of the total area, which was three times that from 1990 to 2000. During 1990 to 2000 and 2000 to 2010, the greatest land use/cover type changes were from forest land to dry land or from dry land to forest land. The annual change rates of land use/cover was drastic for dryland from 1990 to 2000 while residential land from 2000 to 2010. The biggest dynamic change area of land use/cover changes was dryland for both 1990 to 2000 and 2000 to 2010. During 1990 to 2000, the land use/cover changes had little effect on total nitrogen(TN) and total phosphorus(TP) loads from non-point source. During 2000 to 2010, however, land use/cover changes significantly reduced the loads of TN and TP, which was 78.5 and 6.1 t·a-1 respectively. The contribution of different land use/cover changes to TN and TP loads varied. The reduction of TN load mainly happened when dry land changed to forestland. The conversion from paddy field to forestland decreased TP load, whereas turning dryland to paddy field increased TP load. In the establishment of the quantitative relationship between export coefficients and different land use/cover type area, the land use/cover changes calculated by static area could not reflect its impact on the TN and TP loads, while the land use/cover changes calculated by process area was a good indicator of TN and TP loads. |
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