Effects of nitrogen addition on the physical properties of soil in an alpine meadow on the eastern Qinghai-Tibetan Plateau Effect of lucerne-crop rotations on soil physical properties in the semiarid Loess Plateau of Central Gansu Quantitative characteristics of soil aggregates under different vegetations in upper reach of Minjiang River Effect of quality of dispersing solutions on soil aggregates stabilities during the wet-sieving test Application of le bissonnais method to study soil aggregate stability under different vegetaion on the loess plateau Organic carbon fractions and aggregate stability in an aquatic soil as influenced by agricultural land uses in the Northern China Plain Study on Soil Aggregate Stability and Soil Erodibility in the Grassland Vegetation of the Loess Plateau Region Soil aggregate stability and soil organic carbon characteristics in Quercus variabilis and Pinus tabulaeformis plantations in Beijing area.