论文部分内容阅读
通过对不同留茬高度对地表风速的影响以及留残茬(保护性耕作主要方式)、旋耕和常规翻耕3种耕作方式对土壤风蚀的影响进行比较研究,得出如下结果:留茬高度对地表风速的影响程度不明显,仅与地面有无留茬有关,留茬20cm左右即可有效降低地表风速,减少田间扬沙,抵抗土壤风蚀,是比较适宜的留茬高度;留茬(保护性耕作)、旋耕和常规翻耕3种耕作方式对田间扬沙情况的影响差异明显,其中在60cm高度以内,留茬比常规翻耕减少田间扬沙量34.9%,比旋耕方式减少61.5%,因此,留茬(保护性耕作)是一种有效防止农田土壤风蚀的耕作方式。
By comparing the effects of different stubble height on surface wind speed and the effects of residual stubble (the main way of conservation tillage), rotary tillage and conventional tillage on soil wind erosion, the following results were obtained: Stubble height The effect on surface wind speed is not obvious, only with the presence of stubble on the ground, stubble 20cm or so can effectively reduce the surface wind speed, reduce the sand field to resist wind erosion, soil stubble is more appropriate stubble (stubble Tillage and conventional tillage had significant differences on the situation of sand production in the field. Within 60 cm of height, stubble reduction compared with conventional tillage reduced the amount of sand dredging 34.9% in the field and 61.5% less than that of rotary tillage Therefore, stubble (conservation tillage) is a farming method that effectively prevents soil erosion in farmland.