摘要
河北坝上地区不同类型耕地土壤风蚀及其影响因素的野外观测结果表明，风蚀强度由秋翻地到春翻地和留茬地明显降低。其中在秋翻地，随着土壤不可蚀性颗粒的增加，风蚀量减少，但因土壤富含粗砂和砾石，易导致土壤粗化、土地生产力下降；在春翻地和留茬地，随土垄高度（犁沟深度）和作物残体盖度的增加，风蚀量显著减少。据此认为，在农田防护林体系仍不完善的河北坝上高原农垦区，应采作留茬深耕等耕作措施，以有效地控制土壤风蚀，减轻风蚀危害。
Field ohservation of roil wind erosion in farmland under different tillage practices inBashang area, Hebei province was conducted.The results show that wind erosion was reducedsignificantly from fall plouged land to spring plouged land and stubble mulch land. The erosiondecreased with increasing of noneredible particles in fall plouged land, but it lead to soil coarsningand derlining of soil preductivity because there is more coarse sand and gravel in the seil.Theerosion decreased with increasing of soil ridges.in spring ploughed land and crop residue cover instubble mulch land.Therefore,the best tillage practice is fall mulch farming and spring deepploughing in order to control the soil wind erosion effectively in such area where lacking of effi-cient shelters system.
基金
国家"八五"攻关项目
关键词
春翻地
风速
输沙量
留茬地
土壤风蚀
深耕
耕作方式
秋翻地
Bashang area of Hebei province
soil wind erosion
tillage practices
influ-encing tactors
