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THE URBAN ECOLOGICAL STUDIES IN CHINA A review on urban metabolism research based on physical space entities for environmental management. Nitrogen metabolism and translocation in arbuscular mycorrhizal symbiote and its ecological implications. Evaluation on the eco-economic benefits of small watershed in Beijing mountainous area: A case of Yanqi River watershed. Forest resources in Qingyuan County of Liaoning, Northeast China: Their structure and optimal spatial allocation. POTENTIAL PRODUCTIVITY AND POPULATION CARRYING CAPACITY OF CHINA‘S AGRO-ECOSYSTEM CYCLES OF NITROGEN, PHOSPHORUS AND KALIUM AS THE NUTRIENT ELEMENTS IN AN AGRO-FORESTRY ECOSYSTEM OF THE POPU-LUS/EURAMERICANA-TRITICUM SATIVUM -ZEA MAYS COMMUNITY-TYPE ECOLOGICAL COMPLEXITY——REVIEW AND PROSPECT ADVANCES IN MOLECULAR ECOLOGY THE MODELS OF MEDICAL GEOGRAPHY AND TERRITORIAL ANTHROPO-ECOSYSTEM