水土保持耕作系统被定义为:为防止水蚀,栽植后土地表面的残余物覆盖度保持在30%以上;或在以风蚀为主的地区,侵蚀高峰期土地表面保留不少于相当于1.12t/hm~2圆滑小颗粒的残余物,包括免耕法或称缝植法、垄耕法、带耕法、覆盖耕作法和少耕法等。研究表明,实施免耕法1年后,土壤表层7.6cm内的微生物生物量达到最大值;10年后趋于平衡状态—比传统耕作方 Soil and water conservation farming system is defined as: To prevent water erosion, the surface coverage of the land remained above 30% after planting; or in wind erosion-dominated areas, the land surface erosion during peak erosion should not be less than 1.12t / hm ~ 2 smooth small particles of the residue, including no-tillage or suture planting method, furrow method, with tillage, cover tillage and less tillage. The results showed that after one year of no tillage, the microbial biomass within 7.6 cm of soil surface reached its maximum value, and ten years later it became more balanced than that of conventional tillage