Ecological ditch system with interception function and its effects on controlling farmland non-point pollution

Abstract

Abstract: Aiming at the severity of farmland non-point pollution and the fact of more population with less arable land in Taihu Lake basin,this paper set forward a new ecological engineering solution,ecological ditch system with interception function,which consisted of project part and plant part.This system could decrease flow rate,promote the sedimentation of particulate materials carried by paddy runoff,enhance the plant absorption and removal of the nutrients from ditch wall,water body and sediments,and thus,effectively prevent the runoff nutrients from paddy fields entering into adjacent water bodies.The plants in the ditch system could bring back definite economic returns and gave good aesthetic sights,and the removal rate of runoff total-N and total-P by the ditch system was 48.36% and 40.53%,respectively.Another distinct character of the solution was no additional land costs,which accorded with the reality of the farmland ditches in plain region with water nets,possessing a good practical prospect.

Key words: Community structure, Height class, Diameter class, Dynamic analysis

CLC Number:

X171.4

YANG Linzhang, ZHOU Xiaoping, WANG Jianguo, WANG Dejian, SHI Weiming, SHI Longxin. Ecological ditch system with interception function and its effects on controlling farmland non-point pollution[J]. cje, 2005, (11): 1371-1374.

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