中文摘要：

借助树木水文学的方法,文章以对塔里木河下游主要建群植物胡杨年轮的生长量变化进行深入分析。结果显示：塔里木河下游生态输水后,胡杨样枝年轮生长量变化明显,说明输水对胡杨生长量的影响是显著的和积极的;输水后胡杨年轮生长量表现出明显的时空动态变化规律。随着输水时间的延续,在离河不同距离处胡杨年轮生长量变化没有一直出现单调递增趋势,而在一段时间内开始下降;从空间变化看,离河不同距离的胡杨生长量对输水的响应存在的差异。在离河一定范围内,胡杨生长量随着距离的增加而出现减少趋势,但达到一定距离,胡杨生长量开始突然出现增加现象。这表明胡杨样枝年轮生长量的时空差异具有复杂性和突变性。

英文摘要：

The ecological watering to the lower reaches of Tarim River has been carried out for seven years since 2000.The groundwater level has change greatly and the natural vegetation also has obvious response to the ecological watering.Adopted the methods of Dendrohydrology,his paper analyze the temporal and spatial change in branch-ring growth of the Populous Euphrates,the main plant species in the lower reaches of Tarim River.The results show： the branch-ring of the Populous Euphrates change dramatically after the ecological water conveyance in the lower reaches of Tarim River,which indicate that the benefit of the ecological watering on the growth of Populous Euphrates is significant.The branch-ring growth of Populous Euphrates shows temporal and spatial characteristics after watering.With the increase in watering to the lower reaches,the branch-ring width and areas do not always keeping an increasing trend but begin to decrease when they increase to certain level in certain period.Seen from the spatial change,the response of branch-ring growth to the times of the ecological watering has difference.The branch-ring width and areas decrease with increasing the distances in certain range of the distance from water channel,but they begin to increase when the distance is up to certain range,which indicate the temporal-spatial variation in response of branch-ring growth of Populous Euphrates has characteristics of complexity and abnormality.