中文摘要：

采用野外调查取样与室内试验相结合的方法,在分析土壤颗粒组成、级配状况与群体特性、团粒结构的分形特征及其稳定性变化的基础上,研究了黄土丘陵沟壑区撂荒地不同演替阶段植物群落的土壤抗蚀性.结果表明：撂荒后植被从一年生草本群落阶段演替到多年生蒿禾类草本群落阶段的过程中,土壤的级配状况在不断改良,颗粒分形维数增大,团粒结构有所改善,土壤团粒结构的分形维数与结构体破坏率均不断减小,稳定性不断增强,从而提高了土壤的抗蚀性.实现植被的自然恢复对改善该区土壤结构、提高土壤抗蚀性、减少水土流失和促进区域生态环境可持续发展具有重要意义.

英文摘要：

Field survey and laboratory experiment were conducted to study the soil anti-erodibility of abandoned croplands during different vegetation succession stages in hilly-gullied region of the Loess Plateau,based on the analysis of soil particle composition,size distribution and group characteristics,soil aggregate fractal dimensions and stability. The results showed that in the earlier stages of succession from annual to perennial herbs in abandoned croplands,soil size distribution changed a little bit,the fractal dimension of soil particle increased,soil structure improved,fractal dimension and damage percent of soil aggregate structure decreased, soil stability increased, thus soil anti-erodibility increased. Therefore,natural restoration of vegetation is of great significance to improve the soil structure,increase soil erosion resistance,reduce soil erosion and promote sustainable development of regional ecological environment.