选取3 类典型冲沟(活跃、较活跃和稳定)的集水区、沟头和沟床土壤，探明冲沟不同空间部位土壤机械组成特性及其抗冲性差异，结果表明：①活跃、较活跃冲沟土壤质地均为砂质壤土，稳定冲沟各部位土壤质地各不相同；黏粒含量、粉粒含量总体为活跃冲沟<较活跃冲沟<稳定冲沟；细砂粒含量为较活跃冲沟>活跃冲沟>稳定冲沟；粗砂粒含量则是活跃冲沟>较活跃冲沟>稳定冲沟。②3 类冲沟各部位土壤抗冲性均是沟床最高，而3 类冲沟同一部位抗冲性大小比较中，沟头和沟床土壤抗冲性为稳定冲沟>较活跃冲沟>活跃冲沟，集水区以活跃冲沟土壤抗冲性最小，较活跃与稳定冲沟的土壤抗冲性相当。③线性回归分析表明：砂粒含量是影响3 类冲沟各部位土壤抗冲性的主要指标，黏粒含量影响稳定冲沟各部位土壤抗冲性，粉粒含量与较活跃冲沟沟头、稳定冲沟集水区和沟床的土壤抗冲性有关。研究结果从土壤机械组成和土壤抗侵蚀性的关系角度为冲沟研究提供一定的理论参考。

The gully area with tattered landform and loosen soil structure has threated to the restoration of degraded ecosystem in dry-hot valley. For ascertaining the different characteristics of soil mechanical composition and soil antiscourability (ANS), the soil samples were collected from three different gully positions of the gully watershed, gully heard and gully bed in each of active gully, semi-active gully and stable gully. The results indicated that active gully and semi-active gully were distributed with sandy loam soil, but soil texture in stable gully varied with soil position in the gully. The contents of soil
clay and silt followed the same order: stable gully > semi-active gully > active gully, while the coarse sand content followed an opposite order. Fine sand content followed the order: semi-active gully > active gully > stable gully. The ANS of the soil in gully
beds were the highest among the three positions for all gullies. The soil ANS in gully heard and gully bed followed the order: stable gully > semi-active gully > active gully. The watershed of active gully had the lowest soil ANS and the soil ANS of semi-active gully watershed was similar to that of the stable gully watershed. The linear regression analysis indicated that the sand content was the main factor affecting the soil ANS in three different gully positions of different activities gullies. The clay content was the main factor affecting the soil ANS in three gully positions of stable gully. The silt content was related to the soil ANS of the semi-active gully head and watershed and bed of stable gully. The research results can be expected to provide theoretical references for the further study on the relationship between soil texture and soil anti-erosion.