Analysis on the Radial Growth Characteristics of Populus euphratica at Different Degradation Stages in the Lower Reaches of Tarim River
We analyzed the radial growth quantity variation of Populus euphratica at different degradation stages in the lower reaches of Tarim River through the method of tree rings of hydrology,employing the LINTABTM 6-type tree ring tester to read the width of tree rings.The results are as follows:(1) the average radial growth quantity was influenced evidently and reached a growth peak period after ecological irrigation;(2) ecological irragation emergently promoted the growth of Populus euphratica mutationally;if the amount of ecological irrigation had not been reached a certain quantity,radial growth of Populus euphratica will show as no longer growth or decline in a short period of time;if the Populus euphratica is kept grow well,delivery water should be continued;(3) radial growth quantity of Populus euphratica at different degradation stages was very significant (p＜0.01) in the lower reaches of Tarim River.The sequence of average radial growth quantity of Populus euphratica at different degradation stages over years was moderately degraded area＞extremely degraded area＞ seriously degraded area;Populus euphratica of different degradation stages responded to water irrigation differently and had the hysteresis;Average radial growth quantity of Populus euphratica at different degradation stages had a bigger difference in terms of the year of average radial growth of extremum after ecological irrigation;(4) the differences of average radial growth quantity of Populus euphratica in the different distances from the water channel at different degradation stages were very significant (p＜0.001) in lower reaches of Tarim River.On the whole,as the distance from the water channel increased,the radial growth quantity of Populus euphratica showed a downward trend.
lower reaches of Tarim Riverradial growth quantity of Populus euphraticaecological irrigation
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