the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Effects of ecological factors and human activities on nonpoint source pollution in the upper reach of the Yangtze River and its management strategies
Abstract. The effects of ecological and human activities on nonpoint source (NPS) pollution are key issues for sustainable water resources management. In this study, the Improved Export Coefficient Model and the Revised Universal Soil Loss Equation were adopted to estimate the annual loads of NPS pollutants during the period from 1960 through 2003 in the upper reach of the Yangtze River (URYR). Ecological factors and human activities affecting NPS pollution were distinguished and their respective effects were assessed. Variations of the dominant cause (between ecological factors and human activities) were presented. Furthermore, the combined effect of them on NPS pollution were successfully revealed. The results showed that the annual loads raised from ecological factors of dissolved nitrogen (DN) and dissolved phosphorus (DP) were relatively steady from 1960 to 2003. But those of sediment, absorbed nitrogen (AN) and absorbed phosphorus (AP) decreased during that period. In terms of the annual loads caused by human activities, those of dissolved pollutants increased from 1960 to 2000 and then fell. Those of sediment as well as absorbed pollutants peaked in 1980 and then decreased. Simultaneously, the dominant cause of DN loads shifted from ecological factors to human activities after 1980 while DP loads were mainly contributed by human activities. However, sediment, dissolved pollutants were primarily exported by ecological factors. Finally, strategies for managing anthropogenic activities were proposed and their effects on NPS pollution reduction were also depicted quantitatively.
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RC C91: 'Referee Comment of Jiake LI for hess-2013-599', Jiake LI, 08 Feb 2014
- SC C122: 'Xiaowen Ding's reply for professor Li's comments', Xiaowen Ding, 14 Feb 2014
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RC C216: 'Comment', Anonymous Referee #2, 28 Feb 2014
- AC C333: 'Thank you and the authors' reply for the comments', Xiaowen Ding, 07 Mar 2014
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RC C596: 'Referee Comment', Anonymous Referee #3, 21 Mar 2014
- RC C600: 'Authors’ reply for the comments', Jiake LI, 21 Mar 2014
- AC C602: 'Reply to the referee who gave the comments', Xiaowen Ding, 21 Mar 2014
-
RC C91: 'Referee Comment of Jiake LI for hess-2013-599', Jiake LI, 08 Feb 2014
- SC C122: 'Xiaowen Ding's reply for professor Li's comments', Xiaowen Ding, 14 Feb 2014
-
RC C216: 'Comment', Anonymous Referee #2, 28 Feb 2014
- AC C333: 'Thank you and the authors' reply for the comments', Xiaowen Ding, 07 Mar 2014
-
RC C596: 'Referee Comment', Anonymous Referee #3, 21 Mar 2014
- RC C600: 'Authors’ reply for the comments', Jiake LI, 21 Mar 2014
- AC C602: 'Reply to the referee who gave the comments', Xiaowen Ding, 21 Mar 2014
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Cited
6 citations as recorded by crossref.
- Research on Nonpoint Source Pollution Assessment Method in Data Sparse Regions: A Case Study of Xichong River Basin, China X. Liu et al. 10.1155/2015/519671
- Long-Term Effects of Anthropogenic Factors on Nonpoint Source Pollution in the Upper Reaches of the Yangtze River X. Ding & L. Liu 10.3390/su11082246
- Effects of Precipitation and Topography on Total Phosphorus Loss from Purple Soil X. Ding et al. 10.3390/w9050315
- An assessment of chlorophyll-aconcentration spatio-temporal variation using Landsat satellite data, in a small tropical reservoir T. Dalu et al. 10.1080/10106049.2015.1027292
- Alarming nutrient pollution of Chinese rivers as a result of agricultural transitions M. Strokal et al. 10.1088/1748-9326/11/2/024014
- Influence Mechanisms of Rainfall and Terrain Characteristics on Total Nitrogen Losses from Regosol X. Ding et al. 10.3390/w9030167