农田排水策略对氮素流失影响试验研究  

Effects of Farmland Drainage Strategy on Nitrogen Loss

作　　者：王苏胜[1] 周明耀[1] 刘璐嘉[1] 

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225009

出　　处：《灌溉排水学报》2013年第3期138-140,共3页Journal of Irrigation and Drainage

基　　金：江苏省自然科学基金重点项目(BK2010041);水利部公益性行业科研专项经费项目(201201005);江苏省普通高校研究生科研创新计划项目(CXLX11_1014)

摘　　要：通过测筒试验模拟了排水间隔时间、强度和地下水位对农田地下排水中氮素流失的影响规律。结果表明,相同模拟条件下,排水间隔时间的延长可减少排水量和降低总氮流失率,以间隔3～5d减少最为明显;间隔3、5和7d排水总氮流失量分别较间隔1d减少了45.5%、81.1%和100%;排水强度的降低可以减少氮素的流失,出流中氨氮质量浓度递减并趋于稳定,硝态氮质量浓度先上升后减少,相对于2mm/d的排水强度,4、6和8mm/d排水强度下总氮流失量分别增加了126.8%、264.8%和401%。地下水位的升高可明显减少总排水量和总氮流失量,40cm和60cm地下控制水位比80cm水位排水总氮量分别减少63.2%和40.9%。Effects of the interval time, intensity and groundwater level of drainage on nitrogen loss in farm- land subsurface drainage were simulated. The results showed that the extension of drainage interval time would reduce drainage outflow and TN loss in the same simulated conditions, and the interval time of 3-5 d decreased the most obviously. Compared to the interval time of 1 d, TN losses of the interval time of drainage 3 d, 5 d, and 7 d reduced by 45.5%, 81. 1% and 100% respectively. The reduction of drainage intensity could reduce the loss of nitrogen. The NH＋ --N concentration of outflow decreased and trended to be stable finally, and the concentration of NO3- --N increased first and then decreased. TN loss of drain- age intensity of 4 mm/d, 6 mm/d and 8 mm/d increased by 126.8%, 264. 8% and 401% respectively com- pared to drainage intensity of 2 mm/d. The rise of groundwater level could significantly reduce the outflow and TN loss. TN loss under ground water level of 40 cm and 60 cm decreased by 63.2% and 40.9% re- spectively compared to ground water level of 80 cm.

关 键 词：农田排水 策略 氮素流失 控制 

分 类 号：S276.1[农业科学—农业水土工程]