%0 Journal Article
%T N losses from different cropping modes in the purple hilly region of the Sichuan Basin<br>四川盆地紫色丘陵区不同种植模式下氮流失特征
%A 罗艺
%A 吴福忠
%A 杨万勤
%A 王旭熙
%J 环境科学学报
%D 2010
%I 
%X N loss in agriculture is an important source of non-point pollution. To characterize N losses from different cropping modes in the purple hilly region of the Sichuan Basin, N loss in runoff and infiltration of 8 available rainfall events from December 2008 to August 2009 were studied in 4 representative cropping modes: M1 (Chinese milk vetch-rice), M2 (fallow land-Soybean-fallow land), M3 (fallow land-Ginger) and M4 (Corn-Sweet potato). N losses increased with the increase of rainfall events. The ranked order of N loss was: M3 ((30.388±2.86)kg·hm-2) > M4 ((17.118±1.677)kg·hm-2) > M2 ((10.987±1.108)kg·hm-2) > M1 ((6.090±1.051)kg·hm-2) during the studied period. M4 had the highest amount of runoff and infiltration, while M3 showed the highest N losses from both runoff and infiltration. In addition, N losses were relatively lower in the non-cropping period, and only a few variations were observed among cropping modes. However, the losses of dissolved N and total N from both runoff and infiltration showed the same order as: M3 > M4 > M2 > M1. Nitrate N was the main N form in N losses from both runoff and infiltration regardless of the cropping modes. The proportion of ammonium N and dissolved N to total N loss from infiltration was higher than that in runoff. The results provide data for selection of cropping mode, optimization of cropping habitat, and regional control of non-point pollution from agriculture.
%K cropping mode
%K purple soil
%K N losses
%K non-point pollution<br>种植模式
%K 紫色土
%K 氮素流失
%K 面源污染
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=03A55E61A8750ACAC6AF81EF9E2AC838&aid=EBBFD151BE56E6F6999EB2B1C8D4ADCB&yid=140ECF96957D60B2&vid=340AC2BF8E7AB4FD&iid=708DD6B15D2464E8&sid=93FEF544983216C1&eid=28E08C23724B97C7&journal_id=0253-2468&journal_name=环境科学学报&referenced_num=1&reference_num=0