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采用~(137)Cs法测定土壤侵蚀量和细沟量测的综合研究表明,黄土峁坡的长坡农地,在细沟最大深度未抵达犁底层的坡长范围内,侵蚀速率与坡长呈正相关,大于此坡长后不呈正相关.犁耕层和犁底层组成的双层土壤结构,控制了峁坡农地的细沟发育,决定了侵蚀速率与坡长的关系.径流小区的坡面径流汇聚和细沟发育情况往往与实际峁坡农地差异较大,依据径流小区观测资料统计得出的峁坡农地的侵蚀速率与坡长呈正相关的结论,不适用于长坡农地.
A comprehensive study on the determination of soil erosion and thin-gully measurements by ~ (137) Cs method shows that the erosion rate and slope length of long-slope farmland on the Loess slope are within the range of slope length at which the maximum depth of the rill does not reach the bottom of the plow. And there was a positive correlation between the slope length and the slope length, but no correlation was found between the slope length and the slope length. The double soil structure consisting of plow layer and plow bottom layer controlled the development of the gully in the slope farmland and determined the relationship between erosion rate and slope length. Surface runoff and rill development are often different from actual slope farmland. According to the statistics of runoff plot, the erosion rate of slope farmland is positively correlated with slope length, which is not applicable to the long slope farmland .