【摘要】 通过在紫色土坡耕地上进行横坡垄作,观测了不同坡度坡耕地的水土流失及作物产量状况。结果表明:研究区的降雨集中在4~9月,形成不同坡度的侵蚀降雨量在年际间的分布也不相同。随着坡度的增大,径流量和泥沙量均增大,但径流系数先增大,后减小,再增大。径流量、泥沙量与降雨量在坡度≥15°时均呈极显著正相关关系,而在坡度为20°与降雨强度呈极显著正相关关系;与之相应,随着坡度的增大,除小麦产量是先减小后增大外,其余两种作物(玉米和甘薯)的产量均是先减小后增大,再减小,且三种作物产量变化的过渡坡度均为15°。更多还原

【Abstract】 The characteristics of soil and water loss and crop yield by cross ridge in purple soil of different sloping farmland were studied.The result showed that rainfall concentrated from April to September of the area in each year,and erosion rainfalls were different among years.With the increasing of slope,both of runoff and sediment yield increased,and runoff coefficient increased in lower slope,and reduced in mid-slope,and increased again in higher slope.The relationship between runoff and sediment yield with rainfall got positive correlation at 1% level under the slope≥15°,and the relationship between runoff and sediment yield with rainfall intensity got positive correlation at 5% level under the slope of 20°.With the increasing of slope,the yield of wheat reduced in lower slope,and increased in higher slope,and the yields of other two kinds of crops(corn and sweet potato) reduced in lower slope,and increased in mid-slope,and reduced again in higher slope.The transitional slope of three crops yields were the slope of 15°.更多还原