Ecological significance,characteristics and types of disturbance Effects of soil tillage and straw returning on weed biodiversity in summer maize (Zea mays) field The Relationship Between Biodiversity and Soil Fertility Chara-cteristics on Abandoned Fields in the Tropical Region of Southern China Evaluation on bio-diversity of the forest landscape in Liyang district Study on Enclosing Effects and Biodiversity Variation of Desertification Grassland in Hulunbeir Steppe Progress on measuring forest biodiversity with remote sensing technique Theory and analysis of wetlands’ eco-hydrological configuration