农业非点源污染控制中的最佳管理措施及其发展趋势

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Abstract

Agricultural non-point source(AGNPS) pollution in surface and ground water by nutrients and pesticides has been identified as a major problem since the 1960s. AGNPS is the most important non-point source pollution, which is a significant contributor to eutrophication in aquatic systems. It is more difficult to control AGNPS than point source pollution because of the difficulty and expense of identifying and controlling discharges from no-point sources. Best management practices(BMPs) have been used for AGNPS control for two decades, and they have been designed primarily to control soil erosion. However, BMPs have been widely used in AGNPS control at present. BMPs influence two stages of AGNPS process by reducing the transport and the amount of potentially transportable pollutants. BMPs are the comprehensive practices which integrate with structural practices, cultural practices and management practices. Structural practices include terraces, hillside ditches, grass waterways and vegetable filter strips, constructed wetlands, irrigation systems etc, and their impact is primarily to reduce run-off through increased infiltration. Cultural practices involve conservation tillage, contour cropping and crop rotation to protect the soil surface and reduce erosion. And management practices are consisted of integrated pest management, integrated fertility management and irrigation management, they primarily affect the source of a potential contaminant by increasing usage efficiency. The developing tendency and prospect of BMPs is also discussed.

Key words： Agricultural non-point source pollution(AGNPS) Best management practices(BMPs) Eutrophication developing tendency

Received: 25 April 2005

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	Articles by authors
	CANG Heng-jin
	XU Lian-feng
	LI Zhi-an

Cite this article:

CANG Heng-jin,XU Lian-feng,LI Zhi-an. Using best management practices to control agricultural non-point source pollution[J]. , 2005, 24(2): 173-177.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2005/V24/I2/173

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