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Biomass and Carbon Density and Patterns of Their Distribution in the Plantations of Robinia pseudoacacia and Pinus tabulaeformis in Loess Gullies in Eastern Gansu Soil nitrogen concentrations and transformations under different vegetation types in forested zones of the Loess Gully Region Niche characteristics of dominant populations of Sophora davidii community in loess gully region Research of Erosion and Sediment Yield in Earth Road Drainages in Loess Gully Region Characteristics of physiological groups of soil nitrogen-transforming microbes in different vegetation types in the Loess Gully region, China Changes in composition and structure of plant communities during the course of restoration at loess gully region