Spatio-temporal characteristics and driving force of land-use change in Beijing‘s ecological environs—A case study of Weichang County,Hebei Province Effects of conversion of evergreen broad-leaved forest to Chinese chestnut plantation on soil organic carbon pools. Effects of Land-use Change on Vertica l D istr ibution and Storageof So ilOrgan ic Carbon in North Subtropica l Area s Effects of Land-use Change on Soil Carbon Storage in Grassland Ecosystems Carbon and nitrogen sequestration rate in long-term fenced grasslands in Inner Mongolia, China COMPARISON OF SOIL RESPIRATION IN BROAD_LEAVED KOREAN PINE FOREST AND RECLAIMED CROPLAND IN CHANGBAI MOUNTAINS, CHINA Ecological effects of land-use changes in a small town of Zhejiang Province,China Effect of land-use change on soil habitat in north Hebei plateau during last 50 years