The Difference of analyses Populus euphratica’s tree ring growth before water transport and after water transport in the lower reaches of Tarim River

The down river 365 km river have completely stopped since Daxihaizi reservoir had been built in the lower reaches of Tarim River in 1972. In order to restore green corridor and improve the environment at the lower reaches of Tarim River, the project of transporting water to the lower reaches of Tarim River was carried out from May, 2000. Up to now, it has been completed seven times. In this paper, the response of Populus euphratica to implementing the project of transfusing stream water for regenerating the ecology in the lower reaches of the Tarim River is analyzed. The analysis was based on the sampling of Populus euphratica’s tree ring in the section Yingbazha in the middle of Tarim River and the sampling of Populus euphratica’s tree ring in the section of Yinsu,Karidayi and Alagan in the lower reaches of Tarim River. The difference of the growth of the Populus euphratica’s tree ring of before and after water input at the different distance to Tarim River in the same year was compared by the analyses of statistics. The result shows: 1) Compared with the growth of Populus euphratica’s tree ring before water input, from 0 to 300 m in the section of Yingsu and Kaerdayi, the water input can increase the growth of Populus euphratica’s tree ring. From 300 m to 700 m in the section of Yingsu and Kaerdayi, the water input can increase the growth of Populus euphratica’s tree ring. From 700 m to 1 000 m in the section of Yingsu and Kaerdayi, the water input cannot increase the growth of Populus euphratica’s tree ring. By analyzing the growth mean remainder of Populus euphratica’s tree ring before and after water input, the growth of Populus euphratica’s tree ring decreased with the increase of the different distance to Tarim River in the same section. 2)The sequence of growth of 3 sections from 0 to 300 m in the distance to the lower reaches of Tarim River is Karidayi Yinsu Alagan. From 300 m to 700 m,it is Karidayi Alagan Yinsu. 3)In order to compare to the growth of Populus euphratica’s tree ring in the lower reaches of Tarim River, the growth of Populus euphratica’s tree ring in the middle of reaches of Tarim River is consulted .The results show that before water input, the growth of Populus euphratica’s tree ring is smaller than it after water input in different distance in the middle of Tarim River. From 0 to 300 m in the distance to Tarim River, the growth of Populus euphratica’s tree ring is bigger than it in the middle reaches of Tarim River. From 300 m to 700 m in the distance to Tarim River, the growth of Populus euphratica’s tree ring is nearly the growth of Populus euphratica’s tree ring in the middle reaches of Tarim River. From 700 m to 1 000 m in the distance to Tarim River, the growth of Populus euphratica’s tree ring is smaller than it in the middle reaches of Tarim River. So the water input accelerated obviously the growth of Populus euphratica’s tree ring.