水利学报Issue(4)：410-418,9.DOI:10.13243/j.cnki.slxb.2014.04.005
秸秆还田条件下稻田田面水不同形态氮动态变化特征研究
Study on dynamics of Nitrogen in different forms in surface water of paddy field under straw return
摘要
Abstract
In order to explore the effective tillage for reducing nitrogen losse and improving lake water qual-ity, field experiments were conducted to study the dynamics of TN (total nitrogen), DN (dissolved nitro-gen),DON (dissolved organic nitrogen),ammonia nitrogen (NH4+-N) and nitrate nitrogen (NO3--N) concen-trations in surface water of paddy field in the Chaohu Lake region in two consecutive years. The results show that the concentrations of TN、DN、DON and NH4+-N in surface water reached the maximums after 2 or 4 days of urea application, then declined rapidly, and finally leveled off after 8~10 days. The NO3--N concentration remained at a low level during the whole rice growing seasons, although it showed a little raise after 4 or 6 days of urea application. Obviously, it is the critical period for controlling N loss from paddy field within 8~10 days after urea application. Straw return could effectively decrease the higher con-centrations of TN, DN and NH4+-N in surface water during the earlier stage, whereas the differences in DON concentration was not so significant. Therefore, straw return is beneficial for lowering the potential risk of N loss. Furthermore, DN was the predominant form of TN in surface water, which accounted for 63.2 %~88.8 % of the TN. Within 8 days after urea application, the proportion of NH4 +-N to TN was 33.8%~69.9%. DON was a significant component of TN in surface water,which suggested that its ecologi-cal and environmental effects should not be neglected. The results also show that the rice yields of CTS in-creased significantly by 12.25% and 7.68% compared with CT,which indicated that straw return could in-crease the rice yields. The findings indicate that assuring the production of rice yields, straw return ap-peared to be an effective measure for the source control of the nitrogen loss from paddy field in the Chao-hu Lake region.关键词
农业面源污染/氮素/秸秆还田/水体富营养化Key words
agriculture non-point source pollution/nitrogen/straw return/eutrophication分类
资源环境引用本文复制引用
王静,郭熙盛,王允青,吕国安..秸秆还田条件下稻田田面水不同形态氮动态变化特征研究[J].水利学报,2014,(4):410-418,9.基金项目
国家科技支撑计划项目（2012BAD15B03）；安徽省科技厅项目（1406C085025，1206C0805033）；安徽省农业科学院科技创新团队建设项目（11C1007）；国家科技支撑计划项目 （）
