水利学报2015，Vol.46Issue(12)：1406-1413,8.DOI:10.13243/j.cnki.slxb.20150552
生态沟渠对水稻不同生长期降雨径流氮磷的拦截效应研究
Studies on the interception effects of ecological ditch on nitrogen and phosphorus in the rainfall runoff of different rice growth period
摘要
Abstract
With huge loss of farmland nutrient becoming a main source of agricultural non-point source pol?lution, it is significant to study the interception effects of ecological ditch on nitrogen and phosphorus in the rainfall runoff happened in different rice growth period, which has rarely been reported before. In this paper, a typical area of farmland was chosen in Hejiabang Creek basin surrounding Tai Lake. The ecologi?cal ditch was built based on the transformation of natural drainage ditch. Besides, the interception effects of ecological ditch on nitrogen and phosphorus in the three rainfall runoff events happened in different rice growth periods was monitored. The results show that (1) in the process of three different rainfall events,the average removal rate of TN (total nitrogen) and TP (total phosphorus) by ecological ditch are 31.4% and 40.8% respectively;(2) the sort order of nitrogen and phosphorus removal rate by ecological ditch is NH4+-N (ammonia nitrogen)> PN (grain nitrogen)> NO3--N (nitrate nitrogen) and PP (particles phospho?rus) > DP (dissolved phosphorus), and the removal rates of PN and PP present down trend along with the increase of the ditch runoff;and (3) ditch sediment content of total nitrogen, total phosphorus in the growth period of rice show a trend of lower after the first increase, which indicates that the ecological ditch has certain self-purification ability and sustainability to the interception of nitrogen and phosphorus.关键词
稻田/降雨径流/生态沟渠/氮磷/拦截效应/沟渠底泥Key words
paddy field/rainfall runoff/ecological ditch/nitrogen and phosphorus/interception effect/ditch sediment分类
农业科技引用本文复制引用
王晓玲,乔斌,李松敏,李建生,任炳昱..生态沟渠对水稻不同生长期降雨径流氮磷的拦截效应研究[J].水利学报,2015,46(12):1406-1413,8.基金项目
国家自然科学基金创新研究群体科学基金(51321065) （51321065）
水体污染控制与治理国家科技重大专项(2012ZX07101-008) （2012ZX07101-008）
国家自然科学基金项目(51439005) （51439005）
