摘要
以塔里木河下游胡杨为研究对象,借助树木年轮水文学的方法,运用LINTABTM6型树木年轮测定仪读取钻心的年轮宽度,研究了塔里木河下游不同退化阶段离河道不同距离胡杨径向生长量的年际变化特征及其差异分析。结果表明:(1)2000年生态输水后,胡杨平均径向生长量有显著的变化,胡杨生长进入了生长高峰期;(2)应急生态输水促使胡杨突变性地增长,如果生态输水没有达到一定的量或持续时间,胡杨径向生长量在短时间内就会表现为不再增长或下降,若要保持胡杨长势良好,要继续加强输水;(3)塔里木河下游不同退化阶段胡杨径向生长量差异极显著(p<0.001),不同退化阶段胡杨多年平均径向生长量大小排序依次是中度退化区>极度退化区>重度退化区;不同退化阶段胡杨对输水的响应均具有滞后性且响应程度不同,输水后处于不同退化阶段胡杨平均径向生长量出现极值的年份存在较大差异;(4)塔里木河下游不同退化阶段离河道不同距离胡杨平均径向生长量差异极显著(p<0.001),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。
We analyzed the radial growth quantity variation of Populuseuphraticaat different degradation stages in the lower reaches of Tarim River through the method of tree rings of hydrology,employing the LINTABTM6-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 euphraticais 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 euphraticain 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 euphraticashowed a downward trend.
出处
《水土保持研究》
CSCD
北大核心
2016年第4期313-317,324,共6页
Research of Soil and Water Conservation
基金
新疆维吾尔自治区高校科研计划科学研究重点项目(XJEDU20121036)
优秀青年科技人才培养项目(2013721032)
关键词
塔里木河下游
胡杨径向生长量
生态输水
lower reaches of Tarim River
radial growth quantity of Populus euphratica
ecological irrigation
