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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.
Based on the analysis of the composition of the soil granule, the grading and population characteristics, the fractal characteristics of the aggregate structure and the changes of its stability, the methods of field survey sampling and laboratory experiments were combined to study the succession of different succession of fallow land in the loess hilly and gully regions Stage plant community.The results showed that the grading of soil was continuously improved and the fractal dimension of grain increased when the vegetation was abandoned from the annual community stage to the perennial herb community stage, The aggregate structure is improved, the fractal dimension of soil aggregate structure and the destruction rate of the structure are decreasing, the stability is continuously enhanced, thus improving the soil corrosion resistance.Realization of vegetation to improve the soil structure in the area and improve Soil erosion resistance, reduce soil erosion and promote the sustainable development of the regional ecological environment is of great significance.