Vegetation and environmental changes based on high resolution pollen records in Shiyang River basin,arid lands NW China during early Holocene Drought characteristics in the shiyang river basin during the recent 50 years based on a composite index The grassland degradation problems of the Minqin oasis, in the lower reaches of the Shiyang River Basin Ecological footprint of water resources in the Shiyang River Basin from 2001-2011 Response of runoff to the climate and land use pattern changes in Shiyang River Basin Spatial evolution process, pattern and mechanism of land cover change in Shiyang River Basin Comparison on changes and theri driving forces of farmland in oases of middle and lower reaches: The case of Liangzhou and Minqin oases in the Shiyang river basin The impact of human activities on net primary productivity based on the coefficient of variation: A case study of the Shiyang River Basin