Estimation of the ecological water demand of natural plants is a key issue for the restoration and reconstruction of a fragile ecological region in arid areas. Tree rings of Populus euphratica in the Yingsu section of the lower reaches of the Tarim River and their responses to climate change and hydrological conditions were analyzed using the nonparametric MannKendall trend test,Mann-Kendall-Sneyers test,moving t-test,one-way ANOVA,and Pearson correlation. The ecological water demand of a desert riparian fo...