生态环境学报Issue(8)：1423-1427,5.
不同施肥水平下菜地径流氮磷流失特征
Characteristics of nitrogen and phosphorus loss by runoff from vegetable fields under different fertilization levels
摘要
Abstract
Analysis of nitrogen and phosphorus losses by runoff from vegetable fields under different fertilizer levels has significance for control of eutrophication in surface. Based on a field plot experiment, three fertilizer scenarios were defined as:normal fertilizer level, fertilization decrease 1 and fertilization decrease 2. The results indicated that, (1) the content of nitrogen and phosphorus in runoff water was relatively high corresponding to different fertilization levels in the vegetable field. The contents of TN, NH4+-N, NO3--N were 20.5-34 mg·L-1, 2.2-2.4 mg·L-1, and 6.3-9.5 mg·L-1 in runoff water respectively;and that of TP and DP were 7.7-11.1 mg·L-1 and 2.1-2.4 mg·L-1. The risk of pollution to water due to nitrogen and phosphorus losses from vegetable fields was high. (2) Decrease of fertilization could significantly decrease the contents of TN and NO3--N in runoff water from vegetable field. In comparison with normal fertilization, decrease of fertilization by 20%and 30%could decrease the contents of TN by 40%and 32%and NO3--N by 23%and 35%respectively. However, decrease of fertilization had no observable influences on the contents of TP and DP in runoff water. (3) The loss loads of TN and NO3--N by runoff under different fertilization conditions were 5.8-7.6 kg·hm-2 and 1.6-2.3 kg·hm-2 in the vegetable fields, respectively. In comparison with normal fertilization, the decrease of fertilization by 20%and 30%could decrease the loss loads of TN by 24%and 19%and NO3--N by 11%and 29%. With different fertilization levels, the loss loads of TP and DP by runoff were 1.7-2.9 kg·hm-2 and 2.5-2.7 kg·hm-2 respectively, and decrease of fertilization could not decrease the loss loads of TP and DP.关键词
肥料用量/菜地/径流/氮磷流失Key words
fertilization amount/vegetable field/runoff/loss of nitrogen and phosphorus分类
资源环境引用本文复制引用
谢真越,卓慕宁,李定强,廖义善,韦高玲..不同施肥水平下菜地径流氮磷流失特征[J].生态环境学报,2013,(8):1423-1427,5.基金项目
广东省中国科学院全面战略合作项目（2011B090300055）；广东省教育部产学研结合项目（2012B091100471）；2011中国科学院院地合作项目；广东省水利厅委托项目(GPCGD112197FT141F1；GPCGD122197FD096F)；广东省自然科学基金项目 （GPCGD112197FT141F1；GPCGD122197FD096F）
