【摘要】 坡耕地种植作物能形成地表覆盖，具有一定的保土功能，其保土原理是作物密度大，地表微起伏和根系的固土作用。保土作用受覆盖度、地形、降雨等影响；用保土作用系数（Ｃ）衡量，仅与覆盖度有关。在黄土高原南部，Ｃ变化在０．１１～０．８６间，因而，提高坡耕地作物植被的保土功能，还需加其它管理措施。更多还原

【Abstract】 Crops in cultivated land can cover soil surface so as to conserve soil because of high crops’ density, coarse in ground and crops’ roots. Soil conservation were affected by crop cover, microtopography and rainfall. The coefficient of soil conservation was only related to crop cover. Ranges of C value was from 0.11 to 0.86. Therefore, increase of soil conservation by planting crops in the gentle slope land also required other management measrues.更多还原