水土保持学报2013，Vol.27Issue(2)：71-75,79,6.
紫色土区小流域不同土地利用类型非点源氮迁移特征
Transport Characteristics of Nitrogen on Different Land-uses Patterns in the Hilly Area of Purple Soil
摘要
Abstract
Long-term plot experiments on runoff at field scale were performed to monitor nitrogen transport from the upland and residential area in the hilly area of purple soil. Results showed that the runoff processes affected the nitrogen transport deeply from upland and residential area. Nitrogen loss via surface flow was the main route of nitrate loss from residential area. In contrast, nitrogen mainly was transported by the interflow in upland. At single rainfall event duration, great temporal variations in nitrogen concentration and loading distribution were observed in residential area which exhibited a strong "first flush" of total nitrogen (TN), particulate nitrogen(PN), and ammonia nitrogen(AN), the mass loadings proportions of 37. 0% TN, 60.0% PN and 36. 0% AN, respectively, were delivered within the first 25. 0% of the runoff volume. In contrast, small variations in nitrogen concentration and loading distribution were observed for upland. The liner regression analysis showed that the nitrogen loss in residential area was clearly correlated with the precipitation, and nitrogen loss from upland was concentrated at the initial rainfall events after the input of N fertilizer. The results showed that the residential area and upland were the most important "hotspot" of diffuse pollution in the catchment, the TN concentration in 2011 were 16. 43 mg/L and 14. 68 mg/L for upland and residential area, respectively, and the loss rate of TN from upland and residential area were 41. 18 kg/hm2 and 222. 05 kg/hm2, respectively. The treatments need to be focused more closely on the residential area and upland at the initial period of runoff and the initial rainfall events after the input of N fertilizer, respectively.关键词
紫色土区/旱地/居民点/氮流失/氮浓度/氮负荷Key words
purple soil/ upland/ residential area/ nitrogen loss/ nitrogen concentration/ nitrogen mass loading分类
农业科技引用本文复制引用
杨小林,陈志超,朱波..紫色土区小流域不同土地利用类型非点源氮迁移特征[J].水土保持学报,2013,27(2):71-75,79,6.基金项目
国家重点基础研究发展计划项目(2012CB417101) （2012CB417101）
