Abstract
This study employed the Surface Energy Balance System (SEBS) algorithm to determine the actual evapotranspiration (ET) trends of the piedmont plain region of the Golmud River Basin between 2001 and 2016 and the effects of climate change and human activities on ET. The results indicate that the regional ET increased in the study area from 2001 to 2016. However, ET trends exhibited no change in most parts (68.58%) of the study area over the 16 years, but increased significantly in saline ponds and areas with vegetation cover, whereas no significant trends were observed in saline marshes or the piedmont Gobi gravel plain. The ET trend was closely related to the land-cover changes caused by human activities in the Golmud River Basin. During the study period, saline pond areas expanded from 50.57 to 257.85 km2 due to potash fertilizer production, and the area of farmland increased from 28.71 to 62.91 km2 and these changes contributed greatly to ET changes. Also, groundwater exploitation for potash fertilizer production and irrigation were correlated with ET.
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