塔里木河上游河岸胡杨径向生长对温度的敏感性

doi:10.13866/j.azr.2018.04.18

摘要/Abstract

摘要： 基于塔里木河上游近64 a的气象数据和上游河岸胡杨年轮资料,分析塔里木河上游河岸胡杨径向生长特征及其与气候因子的关系,并采用敏感度分析方法研究胡杨径向生长的敏感温度。结果表明:① 近170 a来,胡杨年轮生长出现了两个峰值和一个低值,两个峰值出现在1857年和1879年。在1879年以后年轮生长呈现明显下降趋势,1955年达到最低值。此后年轮生长又开始出现增加趋势,1989年以后年轮生长略微降低。② 树轮年轮指数与6—9月的平均温度呈现显著负相关,说明温度是限制塔里木河上游河岸胡杨径向生长的主要因子。随着温度的上升,胡杨径向生长呈现逐渐减小的趋势。③ 河岸胡杨径向生长对温度变化响应敏感度不同。随着温度上升,胡杨径向生长灵敏度降低幅度呈现先增强后减弱的趋势,灵敏度最大值所对应的温度为18.6 ℃。因此,该采样区域的胡杨径向生长的最佳温度是18.6 ℃。

关键词: 河岸, 胡杨, 年轮, 径向生长, 气候变化, 塔里木河

Abstract: Based on the meteorological data and the tree-ring data of Populus euphratica from the upper reaches of the Tarim River,the radial growth of P.euphratica and its correlations with climatic factors were analyzed.The sensitivity of radial growth of P.euphratica to temperature was investigated.The results showed that: ① In the past 170 years,the curve of tree-ring growth of P.euphratica was bimodal with a low value,and the two peaks occurred in 1857 and 1879 respectively.After 1879,the tree-ring growth was in a significant downward trend,and the lowest value occurred in 1955.After that,the tree-ring growth began to increase but decrease slightly after 1989; ② The tree-ring index was negatively correlated with the average temperature from June to September,which indicated that temperature was the main factor affecting the radial growth of P.euphratica in upper reaches of the Tarim River.The radial growth of P.euphratica was in a decrease trend with the increase of temperature; ③ The sensitivity of radial growth of P.euphratica to temperature change was different.The sensitivity of radial growth of P.euphratica to temperature was high at first and then low,and the most sensitive temperature of radial growth of P.euphratica was 18.6 ℃.So it was considered that 18.6 ℃ was the most optimal temperature for the growth of P.euphratica.

Key words: riverbank, Populus euphratica, tree-ring, radial growth, climate change, the Tarim River

苟晓霞, 叶茂, 汪亮亮, 苟晓红. 塔里木河上游河岸胡杨径向生长对温度的敏感性[J]. 干旱区研究, 2018, 35(4): 899-904.

GOU Xiao-xia, YE Mao, WANG Liang-liang, GOU Xiao-hong. Sensitivity of Radial Growth of Populus euphratica to Temperature in the Upper Reaches of the Tarim River[J]. Arid Zone Research, 2018, 35(4): 899-904.

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