农田面源氮素垂向运移负荷估算方法综述

A Review on the Estimation Methods of Vertically-Transferred Nitrogen Loads from Agricultural Non-point Sources

介绍了现有的农业面源污染物垂向运移负荷的估算方法,主要包括数值模拟法、实验估算法和物料平衡法。通过对比,提出了一种从农田面源污染的源和汇两方面,在调查计算施肥量、污水回灌量、径流流失量、作物吸收量等氮负荷的基础上,利用差减法估算农田面源污染对地下水污染负荷的影响的方法。同时定性地讨论了降雨量对地下水面源污染的影响。

Estimation methods of vertically-transferred nitrogen loads from agricultural non-point sources have been reviewed,mainly including the numerical simulation method,experimental method and mass balance method.An method is proposed to estimate the vertically-transferred nitrogen load based on investigated mass of fertilizer application,sewage recharging,experimented losses due to runoff and crops uptake,and consideration of the nitrogen sources and sinks in agricultural land.At the same time,the influence of precipitation on the ground water contamination is discussed qualitatively.