塔里木河中游胡杨径向生长对气候变化的响应研究

摘要

以塔里木河中游荒漠河岸林胡杨为研究对象,选择中游河道新沙吉利克、坎白吾斯坦两个断面,分析塔里木河中游胡杨径向生长量的特点,基于离断面较近的气象站长时间序列的气温数据,采用相关性分析和Mann-Kendall突变检验方法研究塔里木河中游胡杨径向生长量对温度动态变化的响应.结果显示:(1)塔里木河中游的河流沿岸,胡杨径向生长变化与温度变化均呈增加趋势;新沙吉利克、坎白吾斯坦断面胡杨径向生长量突变分别发生在1993年和1998年以后,且该地区的胡杨径向生长量对温度具有滞后性.(2)从时段分析发现,当年6～9月的温度对胡杨径向生长量的促进作用最大,6～9月的温度可能是该地区胡杨径向生长的限制性因子.(3)当年平均温度在13～33℃时,胡杨径向生长量达到最大值;当温度超过33℃,胡杨径向生长量呈现减弱趋势.研究表明,当年平均温度过高或过低都会抑制胡杨的径向生长.%Taking the Populus euphratica forest as the research object,we analyzed the two sections of Xinshajilike and Kanbaiwusitan,and the characteristics of the radial growth of P.euphratica in the middle reaches of the Tarim River.In the middle of the Tarim River,based on the temperature data of the long-time series of the weather station near the cross section,the correlation analysis and the Mann-Kendall mutation test were used to study the response of the temperature change of the radial growth of P.euphratica.Research showed that:(1)the radial growth and temperature changes of P.euphratica showed an increasing trend along the riverside of the middle reaches of the Tarim River.The Mann-Kendall mutation analysis was used to analyze the change of radial growth of P.euphratica along 2 profiles.The result showed that the mutation of radial growth of P.euphratica along the profiles of Xinshajilike and Kanbaiwusitan occurred in 1993 and after 1998,respectively.And the radial growth of P.euphratica in this region had a lag to temperature.(2) From the time analysis,it was found that the temperature of June to September had the greatest effect on the radial growth of P.euphratica.The temperature of June to September might be a limiting factor for the radial growth of P.euphratica in this area.(3) P.euphratica growth temperature in 13-33 ℃,would greatly promote their growth.Although more than 33 ℃,the temperature of P.euphratica growth promoting role,but had a tendency to decrease.Temperature too high or too low would inhibit the growth of P.euphratica.