湖南农业大学学报（自然科学版）2016，Vol.42Issue(4)：398-402,5.
小流域降水径流沟渠中氮磷的流失特征与生态拦截效应
Characteristics of nitrogen and phosphorus losses in ditches and effects of ecological interception by rainfall runoff in a small red soil watershed
摘要
Abstract
An agricultural ditch in headwater of Jinjin River, located at a small watershed in Changsha county, was selected as the study area, changes and losses of nitrogen, phosphorus in ditches and effects of ecological interception from rainfall runoff were analyzed. The results showed that the pollutants concentration and rainfall runoff increased gradually at their highest in preliminary stage of rainfall,however, they decreased gradually after the rainfall. The highest total nitrogen and total phosphorus content reached up to 4.67 mg/L and 0.38 mg/L during raining time respectively, ammonium and nitrate were the predominant forms. The transportation content of total nitrogen and total phosphorus increased at first, and then declined by time, the total nitrogen and total phosphorus content appeared to their maximum at the third days and the second days after the rainfall respectively, and they gradually decreased by time. The ecological interception capacity in ditches of Acorus calamus L. and Zizania latifolia was obviously higher than that of natural purification sections, which indicated that plant interception and assimilation were vital to decrease the nitrogen and phosphorus. The total assimilated nitrogen and phosphorus amounts were 26.90 and 2.34 g/m2 respectively during the rainy season (between April and June) in ditches.The results could provide references for agricultural non point pollution control at river basin scale.关键词
降水径流/氮流失/磷流失/沟渠/生态拦截/非点源污染/长沙县金井河Key words
rainfal runoff/nitrogen losses/phosphorus losses/ditch/ecological interception/non point source pollution/Jinjin river in Changsha county分类
农业科技引用本文复制引用
何洋,余红兵,杨知建,肖润林..小流域降水径流沟渠中氮磷的流失特征与生态拦截效应[J].湖南农业大学学报（自然科学版）,2016,42(4):398-402,5.基金项目
“十二?五”国家科技支撑计划项目(2014BAD14B05)；湖南省战略性新兴产业成果转化项目(2015GK1014)；湖南省科技支撑计划项目(2015NK3003) （2014BAD14B05）
