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Vegetation Development on Tropical Abandoned Fields, Hainan Island, China Plant Traits and Soil Chemical Variables During a Secondary Vegetation Successi on in Abandoned Fields on the Loess Plateau The Relationship Between Biodiversity and Soil Fertility Chara-cteristics on Abandoned Fields in the Tropical Region of Southern China Characteristics of Soil Enzymatic Activity and Nutrient of Pasture from Abandoned Field in Different Years on the Loess Hilly Areas