Effect of Citric Acid, Glucose and Organic Matter on Plant P Uptake and Soil P Fractionations in a Highly Weathered Ultisol The research advances and prospect of ecological stoichiometry STUDIES ON BIOLOGICAL AND BIOGEOCHEMICAL CYCLES IN A YOUNG SECOND-GENERATION CHINESE FIR PLANTATION Biogeochemical characteristics of nutrient elements in ungrazed grassland ecosystem in Xilin River Basin Application and development of terrestrial biogeochemical model Physiological and ecological effects of freezing and thawing processes on microorganisms in seasonally-froze ground and in permafrost Methodology in studies of microbial resource in sediment The effect of land use change on soil carbon, nitrogen, and phosphorus contents and their stoichiometry in temperate sapling stands in northeastern China Modeling Structural and Functional Responses of Terrestria Ecosystems in China to Changes in Climate and Atmospheric CO2 N biogeochemical cycle and its impacts on environments in an agro-forest ecosystem The characteristics of nitrogen fixation, ammonification, nitrification and denitrification in coastal zones Biogeochemical Characteristics of Aquatic Plant in Fields Peninsula,Antarctic Responses of C∶N∶P Ecological Stoichiometry in the Leaves of Atriplex canescens to N Addition