摘要
从坡度与耕作措施相结合的角度,研究了水平沟耕作、普通等高耕作在不同坡度上的土壤侵蚀,可溶性氮素损失,土壤水分的动态变化及对实施水平沟种植的谷子、马铃薯、荞麦等主要作物水分利用效率的影响。结果表明:水平沟耕作与普通等高耕作相比,在坡度增大的过程中,对土壤侵蚀、可溶性氮素均具有稳定的缓冲效应;随着坡度的增大,三种作物水分利用率下降以马铃薯最敏感,其次是荞麦,而谷子相对比较稳定,从对30～200cm 土层储水量的分析得出,水平沟耕作的临界坡度应以20°左右为宜。
With combining slopes and tillage measures,the soil erosion, soluble nitrogen loss,the dynamic change of soil moisture and its effects on water use efficiency of three main crops includ- ing maize,potato,buckwheat planted with level ditch on different slopes have been studied in this paper.The results show: compared with ordinary contour tillage,level-ditch has steady buffering effect on soil erosion and soluble nitrogen loss in the course of slop increasing.With the increasing of slope,the order of three crops sensitivity to the falling of the water use efficency is potato, buckwheat and maize.Through analysing the water storage capacity of soil layer between 30～ 200cm,the important conclusion of proper level-ditch critical slope being 20 degree or so has been drown.
出处
《水土保持学报》
CSCD
北大核心
1993年第2期63-69,共7页
Journal of Soil and Water Conservation
关键词
耕作
水土保持
效应
level-ditch
buffering effect
soluble nitrogen
critical slope
sensitivity
