EVALUATION AND EARLY WARNING OF WATER ENVIRONMENTAL CARRYING CAPACITY IN BAIYANGDIAN BASIN BASED ON TIME-DIFFERENCE CORRELATION ANALYSIS AND FUZZY NEURAL NETWORK CHEN Wenting1,2,3, XIA Qing2, SU Jing2, ZHENG Mingxia2*, XI Beidou1*, 2, XIANG Wei2 (1. School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China; 2. State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 3. Geological Engineering Department, Qinghai University, Xining 810016, China)