中耕对紫色土坡耕地产流产沙影响

Impact of Intertillage on Runoff-sediment-yielding on Sloping Farmland with Purple Soil

四川盆地紫色土地区有除草中耕的习惯。研究中耕对产流产沙的影响对于指导坡耕地管理和水土保持建设具有重要意义。在野外小区开展了人工模拟降雨试验，结果表明：（1）中耕能够增加水分入渗，在19．61mm／h雨强下，可以提高稳渗率2．97％到36．56％，在53．95mm／h下，可以提高稳渗率9．74％到90．46％，在111．69mm／h雨强下，能提高稳渗率12．47％到54．1％；（2）中耕可以减少坡面产流，在缓坡、中等雨强条件下，中耕峰值流量仅相当于对照的30％，而在陡坡、大雨强下，二者的峰值流量十分接近；（3）在小雨和中雨条件下，中耕减少侵蚀产沙，在暴雨条件下的中耕会导致产沙量增加。

Interillage and weeding is the custom in hilly area with purple soil in China. It＇s important to study the effects of intertillage on water and soil loss in slope farmland. Rainfall simulator was used on farming plots before and after intertillage. Results shows： （ 1 ） In intertillage condition, stable infiltration rate increased from 2.97 % to 90.46 % with different rainfall intensity ; （2） Overland discharge decreased 70 % after tillage , but has little variety in steep slope and high intensityrainfall; （3） Sediment-yielding decreased with tillagein low intensity rain condition and increased in high intensity rainfallcondition.