川中丘陵区典型小流域农田生态系统氮素收支探析  

Nitrogen balance of agro-ecosystem in a typical watershed in the hilly area of central Sichuan Basin

作　　者：朱波[1] 彭奎[1] 谢红梅[1] 

机构地区：[1]水利部中国科学院成都山地灾害与环境研究所,成都610041

出　　处：《中国生态农业学报》2006年第1期108-111,共4页Chinese Journal of Eco-Agriculture

基　　金：中国科学院知识创新工程项目(KZCX2-314);中国科学院野外台站基金项目资助

摘　　要：对川中丘陵区典型小流域农田生态系统N素收支分析表明,紫色土丘陵区农田N肥施用量较大,旱地、水田N肥年施用量分别为363.5kg/hm2和161.8kg/hm2,化肥N占小流域农田N素投入的76.65%。除作物收获外,小流域农田生态系统N素年损失量为129.67kg/hm2,且以气态损失为主,旱地农田通过径流、淋洗和泥沙等途径损失的N素年均44.34kg/hm2。小流域农田生态系统N素年均盈余66.8kg/hm2,农田N素盈余加剧了N素损失,并已造成小流域农业非点源N污染。The nitrogen balance of agro-ecosystem in a typical watershed in the hilly area of central Sichuan Basin was studied. The results show that there is an excess application of nitrogen which is 363.Skg/hm^2 in dryland and 161.8 kg/hm^2 in paddy field, respectively. The chemical nitrogen accounts for 76.65% of the total nitrogen input to the agro ecosystem. Besides crops＇ harvest, nitrogen loss from agro-ecosystem amounts to 129.67kg/hm^2·a mainly by gas. Runoff, leaching and rail erosion are other important losses primarily from slope cropland which averages 44.34 kg/hm^2·a. The nitrogen surplus of agro-ecosystem in the small watershed is 66.8kg/hm^2·a, which increases the nitrogen loss and results in non-polnt source pollution of nitrogen to some extent in this watershed.

关 键 词：农业生态系统 紫色土 小流域N素收支 

分 类 号：S181[农业科学—农业基础科学] S157