Analysis of effect of South-to-North Water Transfer Project on aquatic ecosystems of Haihe River Basin Photosynthesis-transpiration coupling mechanism of wheat and maize during daily variation The grassland degradation problems of the Minqin oasis, in the lower reaches of the Shiyang River Basin QUANTITATIVE STUDY ON THE SOIL WATER DYNAMICS OF VARIOUS FOREST PLANTATIONS IN THE LOESS PLATEAU REGION IN NORTHWESTERN SHANXI Climate change impacts on the ecohydrological processes in the Wuding River basin