不同耕作条件下土壤表面粗糙度随时间变化规律研究

Short-term Changes of Soil Surface Roughness under Different Tillage Treatments

为了研究耕作后土壤表面粗糙度随时间变化的规律,通过采用3种不同耕作方式(铧式犁、浅松铲、圆盘耙),在耕作后45天内,每隔5天利用激光土壤表面粗糙度扫描仪测量土壤表面粗糙度的方法,分别研究了耕作后45天内两种粗糙度指数(均方根RMS和自相关长度ACL)随时间变化的规律。研究结果表明,无论以RMS或ACL为土壤表面粗糙度的指标,与耕后天数均为指数模型相关。其中,3种耕作条件下,RMS与耕后天数的相关性在0.88～0.93之间;而ACL与耕后天数的相关性更高,在0.94～0.95之间,通过本实验研究揭示了耕作后短期内土壤表面粗糙度随时间变化的规律,对粗细农业的具体实施具有一定的意义。

For studying the short-term changes of soil surface roughness under different tillage treatments,an experiment was conducted to obtain the soil surface roughness of three tillage treatments,which are ripped,harrowed and rolled surface,within 45 days after tilled.Each 5 days,the soil surface roughness was measured by a laser profile meter.The changes of soil surface in this short term were investigated with two roughness indices which are root mean square（RMS） and autocorrelation length（ACL）.The results showed that,there was obvious correlation between roughness indices and day after tilled with exponential model.The R 2 between RMS and day after tilled was 0.88-0.93 under three tillage treatments.The R 2 between ACL and day after tilled was more than 0.94 under three tillage treatments.This study indicated that,the short-term changes of soil surface roughness after tilled,which would be valuable to improve the precession agriculture.