摘要
在滇池流域进行田间小区试验,选择桃树—大豆套种模式下,每小区地表覆盖36kg和54kg的玉米秸秆,研究秸秆覆盖对农田地表径流中铵态氮、硝态氮、总氮、总磷、径流流失量的影响。结果表明:(1)与对照相比,每小区36kg和54kg秸秆覆盖下,径流量的削减分别为11.50%和52.60%;(2)与对照相比,每小区36kg和54kg秸秆覆盖下,铵态氮、硝态氮、总氮和总磷流失量的削减分别为70.50%和91.1%,70.98%和89.50%,71.27%和90.37%,74.84%和85.71%;(3)与对照相比,每小区36kg与54kg秸秆覆盖使大豆地下部、地上部TN含量分别增加6.91%,13.07%和19.92%,27.64%,使TP含量分别增加12.67%,15.38%和49.33%,28.21%。总之,每小区54kg秸秆覆盖对地表径流中N、P具有更好的削减效果,同时能够促进大豆对N、P养分的吸收。
Field plot experiments at Dianchi lake watershed were conducted to plant soybean under peach trees and were treated by 36 kg straw mulch per one plot and 54 kg straw mulch per one plot in order to study the effect of straw mulch on the losses of NH4＋—N,NO3-—N,TN,TP and surface runoff of the farmland.The results showed that：（1）Compared with the control,the surface runoff in the treatments of 36kg/plot straw mulch and 54kg/plot straw mulch decreased by 11.50% and 52.60%,respectively;（2）Compared with the control,the reduction rates of NH4＋—N,NO3-—N,TN and TP losses in the treatments of 36 kg straw mulch per one plot and 54 kg straw mulch per one plot were respectively 70.50%and 91.1%,70.98%and 89.50%,71.27% and 90.37%,74.84% and 85.71%.（3）Compared with the control,the contents of total nitrogen in the root and shoot of soybean in the treatments of 36 kg straw mulch per one plot and 54 kg straw mulch per one plot straw mulch respectively increased by 6.91% and 13.07%,19.92% and 27.64%,and the contents of total phosphorus increased respectively by 12.67% and 15.38%,49.33% and 28.21%.In general,54 kg straw mulch per one plot was better than 36 kg straw mulch per one plot for decreasing the losses of nitrogen and phosphorus and promoting the absorption of nitrogen and phosphorus to soybean.
出处
《水土保持学报》
CSCD
北大核心
2015年第6期41-44,73,共5页
Journal of Soil and Water Conservation
基金
国家"十二五"水体污染控制及治理科技重大专项(2012ZX07102-003-04-03)
国家科技支撑计划项目(2013BAK13B02)
关键词
秸秆覆盖
套种
地表径流
氮
磷
滇池流域
straw mulch
interplanting
surface runoff
nitrogen
phosphorus
Dianchi lake watershed
