The Relationship Between The Radial Growth Of Populus Euphratica And River Runoff In The Upper And Middle Reaches Of Tarim River

In this paper, we research different variations of the vegetation during thechanges in the runoff process of the upstream and midstream of the TarimRiver,use the Populus tree rings as the object of study,analyze the temporal andspatial variation of tree ring radial growthcharacteristics from differentcross-section,while analyze the spatial and temporal variations of the runoff of theupstream and midstream of the Tarim River.Based of this,we use the lag model to getthe relationship of the Populus euphratica tree ring radial growth and the riverrunoff.explore the trend of the main stream of water supply and the Populus treeecological evolution.The main conclusions are as follows:(1).By researching the spatial and temporal variations of Populus tree ring indexfrom different sections,we found that there are varying degrees of change among thefour sections from the upstream and midstream of the Tarim River, but the overalltrend is m mm..From1986to2010,the average annual growth value of the section ofShazi river is3.624mm. From1980to2010,the annual average growth value of thesection of Xiaojiake river is3,704mm. Form1970-2010, the annual average growthvalue of the section of Xinqiman river is1.985mm.From the ring index curve,we gotthe fitting formula of the four sec ore consistent.,from1970-2010, the average annualgrowth value of the section of Aqi river is2.407tions,it says that there is significantchange among the Populus tree trunk radial growth,it has shown a downwardvariation in the fluctuations.(2).Analyzeing the spatial and temporal variations of the river flow of theupstream and mid stream of the Tarim River furtherly,by Analyzeing the river runoffdata of the four hydrological stations of Alaer,Yingbazha and Wusiman,we can getthe Annual and seasonal variation of years of runoff,and the ratio of the maximumannual runoff and the minimum annual runoff.The curve and the trends of the runoffof the upstream and the midstream of the atarim River in the last5o years show thatthe runoff of the upstream and the mid stream of the Tarim River shows a decre asing trend.As time goes by,in a period of future,it will still show a continuingdownward trend,which tells us the characteristics of instability and imbalance ofyears of runoff of the upstream and the midstream of the Tarim River.The runoffmutation analysis shows that the years when the runoff of the hydrometric station ofAlaer,Xinqiman,Yingbazha and Wusiman mutated are1972、1972、1972和1971。 (3).By analyzeing the relevant data of Populus tree trunk radial growth and river runoff,onecompared with another:Alaer station-Xiaojiake section，Xinqiman station-Xinqiman section；Ybazha station-Aqihekou section；Wusiman station-Shazihekou section,we establish the lagmodel,to get the corresponding relationship between the river runoff and the vegetation growthwithin a certain time frame,then try to establish a simple linear model to quantitatively evaluatethe characteristics of years of lagged effects of populus vegetation of upstream and midstream ofthe Tarim River and runoff.