生态与农村环境学报2012，Vol.28Issue(4)：363-367,5.
上海市浦东农业区降水氮浓度的时间分布
Temporal Distribution of Nitrogen in Precipitation in Agricultural Zone, Pudong, Shanghai
摘要
Abstract
In order to investigate change in nitrogen concentration in precipitation in the agricultural zone of Pudong, Shanghai, its law and affecting factors, and N deposition flux, rains were sampled monthly over a year ( 2008) for analysis of nitrate ( NO3- -N ) and ammonia nitrogen ( NH4+ -N ) concentrations. Results show that nitrogen concentration in rain water and annual N deposition flux were both quite high in the zone, with the mean concentration of NO3- -N being 0. 44 mg ? L-1 and of NFL4+ -N being 1. 36 mg ? L-1 , and the annual deposition flux of NO3- -N being 5. 19 kg ? hm-2 ? a-1 and of NH4+ -N, being 15. 91 kg ? hm ? a-1 , making the annual deposition flux of TN up to 21. 10 kg ? hm2 ? a-1 , of which NH4+ -N accounted for 75. 4%. The concentrations of NO3- -N and NH4+ -N in rain water were lower in the main growing season (April - October) than in the main non-growing season ( November - March). However, in terms of deposition flux, NH4+ -N was higher in the former than in the latter, while NO3- -N did not differ much between the two, which was attributed to the comprehensive effect of human activities, number of rainy days, rainfall, wind direction, etc. . Generally speaking, the nitrogen input with precipitation is of some positive significance to the primary productivity in the study zone, the nitrogen concentrations in rainfall have exceeded the threshold value of water eutrophication, which may intensify eutrophication of the aquatic systems in the zone.关键词
降水/氮/沉降通量/浦东农业区/上海Key words
precipitation/ nitrogen/ deposition flux/ Pudong agricultural zone/ Shanghai分类
资源环境引用本文复制引用
黄文丹,马晨辰,周立旻,郑祥民,张国玉..上海市浦东农业区降水氮浓度的时间分布[J].生态与农村环境学报,2012,28(4):363-367,5.基金项目
国家水体污染控制与治理科技重大专项(2009ZX07317-006-01) （2009ZX07317-006-01）
上海市科技支撑计划世博科技专项(10DZ0581600) （10DZ0581600）
上海市科委资助项目(10DZ1200703) （10DZ1200703）
