Spatio-temporal distribution of epilithic algal chlorophyll a in relation to the physico-chemical factors of Gufu River in Three Gorges Reservoir Relationship between Arbuscular Mycorrhizal Fungi and Soil Enzyme Activities of Beach Plum in Fujiabian Hilly Area The spatio-temporal distribution of arbuscular mycorrhizal fungi in the rhizosphere of Ammopiptanthus mongolicus from Shapotou Response of rotifer community characteristics to environmental factors in a reservoir, Southern China Influence of Planting Density on Root Spatio-Temporal Distribution of Different Types of Maize under High-Yielding Cultivation Conditions SPATIO-TEMPORAL DISTRIBUTION OF ARBUSCULAR MYCORRHIZAL FUNGI FROM ARTEMISIA ORDOSICA IN YULIN CITY OF SHAANXI PROVINCE, CHINA