Pedosphere 24(5): 674--682, 2014
ISSN 1002-0160/CN 32-1315/P
©2014 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| An integrated quantitative method to simultaneously monitor soil erosion and non-point source pollution in an intensive agricultural area |
MA Li1, BU Zhao-Hong1 , WU Yong-Hong1, P. G. KERR2, S. GARRE3, XIA Li-Zhong1 and YANG Lin-Zhang1,4 |
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
2School of Biomedical Sciences, Charles Sturt University, Wagga Wagga, NSW 2678 (Australia)
3Université de Liège, Gembloux Agro-Bio Tech, AgricultureIsLife, Passage des déportés 2, Gembloux 5030 (Belgium)
4
Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014 (China) |
| ABSTRACT |
| In China, some areas with intensive agricultural use are facing serious environmental problems caused by non-point source pollution (NPSP) as a consequence of soil erosion (SE). Until now, simultaneous monitoring of NPSP and SE is difficult due to the intertwined effects of crop type, topography and management in these areas. In this study, we developed a new integrated method to simultaneously monitor SE and NPSP in an intensive agricultural area (about 6 000 km2) of Nanjing in eastern China, based on meteorological data, a geographic information system database and soil and water samples, and identified the main factors contributing to NPSP and SE by calculating the NPSP and SE loads in different sub-areas. The levels of soil total nitrogen (TN), total phosphorus (TP), available nitrogen (AN) and available phosphorus (AP) could be used to assess and predict the extent of NPSP and SE status in the study area. The most SE and NPSP loads occurred between April to August. The most seriously affected area in terms of SE and NPSP was the Jiangning District, implying that the effective management of SE and NPSP in this area should be considered as a priority. The sub-regions with higher vegetation coverage contributed to less SE and NPSP, confirming the conclusions of previous studies, namely that vegetation is an effective factor controlling SE and NPSP. Our quantitative method has both high precision and reliability for the simultaneous monitoring of SE and NPSP occurring in intensive agricultural areas. |
| Key Words: nutrient load, soil particles, spatial variation, vegetation coverage, water runoff |
| Citation: Ma, L., Bu, Z. H., Wu, Y. H., Kerr, P. G., Garre, S., Xia, L. Z. and Yang, L. Z. 2014. An integrated quantitative method to simultaneously monitor soil erosion and non-point source pollution in an intensive agricultural area. Pedosphere. 24(5): 674-682. |
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