中文摘要：

借鉴树木年轮学的方法,运用LINTABTM6型树木年轮测定仪读取钻芯的年轮宽度,研究塔里木河下游的胡杨在生态输水前后主干径向生长量变化规律。结果表明：（1）输水前后胡杨主干径向生长量变化较明显。输水前（1990-1999年）径向生长量为1.078mm,而输水后（2000-2008年）是1.764mm,比输水前增加了0.686mm。（2）胡杨径向生长量对输水的响应具有滞后性,输水后3-4年胡杨生长量达到最高值。（3）距河道不同距离的胡杨主干径向生长量存在显著差异性,整体上随着离河道距离的增加,胡杨径向生长量呈现下降趋势。

英文摘要：

In this paper,we used LINTABTM6 tree-ring measure instrument to read the width of tree-ring,and research the trunk-ring width varied regulation of Populus euphratica before and after ecological irrigation in the lower reaches of the Tarim River.The results indicated：（1）The trunk-ring width variation of Populus euphratica before and after ecological irrigation is obvious.Before irrigation（1990-1999）,the ring width is 1.078mm,and after irrigation（2000-2008）,the ring width is 1.764mm,which increases 0.686mm than before irrigation.（2）The response of Populus euphratica＇s growth to irrigation is sluggish,Populus euphratica＇s growth reaches to peak 3-4 years later since ecological irrigation.（3） There are notable differences in trunk-ring width variation of Populus euphratica when the distances from river-ways are different.As a whole,Populus euphratica＇s growth have appeard to decrease tendency with the increase of distances from river-ways.