摘要
在半湿润易旱区的条件下研究旱地不同耕作法结合覆盖的保水增肥效应。结果表明,覆盖耕作比不覆盖在2 m 土层内蓄水平均增多21.52mm。在覆盖层保护下,径流量降低74.5%,土壤流失量减少89.5%。覆盖后夏季有降温作用,冬季有保温作用。连续覆盖2～3年时,0～10cm 土层有机质含量增加15.39%和17.96%,全氮量增加11.63%和15.49%,全磷量、速效磷量也有不同程度增加,且蚯蚓数量大增。
The paper described the effects of stubble mulch tillage in rainfed landunder semihumid liable to drought areas conditions.The experiment indic-ated that stubble mulch tillage could conservate water 21.52mm more thanno stubble mulch within 2m soil layer.under the protection of layers ofstubble mulches,the runoff had reduced by 74.5%,soil loss had reducedby 89.S%.Temperature could be reduced in summer but maintained in win-ter by stubble mulch.Mulch for 2 or 3 years in succession,soil organicmatter in 0～10cm layer had increased by 15.35%and 17.96%,the amountof total N had increased by 11.63% and 15.49% over no mulch one,theamount of total P and effective P had also increased in varying degrees,and the amount of earthworms had increased greatly
出处
《莱阳农学院学报》
1989年第3期17-22,共6页
Journal of Laiyang Agricultural College
关键词
旱地
残茬
覆盖
耕作
土壤
水分
Rainfed land
stubble mulch
soilillatge
