水热因子对塔里木河下游胡杨年轮指数和植被指数的影响

汪亮亮; 叶茂; 高生峰; 苟晓霞; 徐俏; 张同刚

doi:10.3969/j.issn.1000-2006.201609005

汪亮亮，叶茂，高生峰，苟晓霞，徐俏，张同刚

南京林业大学学报（自然科学版） ›› 2017, Vol. 41 ›› Issue (05) : 85-91.

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南京林业大学学报（自然科学版） ›› 2017, Vol. 41 ›› Issue (05) : 85-91. DOI: 10.3969/j.issn.1000-2006.201609005

研究论文

水热因子对塔里木河下游胡杨年轮指数和植被指数的影响

汪亮亮，叶茂，高生峰，苟晓霞，徐俏，张同刚

作者信息 +

Effects of hydrothermal factors on vegetation index and tree-ring index of Populus euphratica in the lower reaches of the Tarim River

WANG Liangliang, YE Mao^*, GAO Shengfeng, GOU Xiaoxia, XU Qiao, ZHANG Tonggang

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摘要

【目的】探索塔里木河流域树木年轮与植被遥感间的关系。【方法】借助树木年轮学的方法和技术手段,利用塔里木河下游10个采样点的胡杨样芯数据和长时间序列中国植被指数(GIMMS NDVI)数据及水热因子数据,在分析该区胡杨年轮指数和植被指数变化特征基础上,重点探讨水热因子、胡杨年轮指数及归一化植被指数(NDVI)三者间的相关性。【结果】胡杨年轮指数和年际NDVI变化在1980—2001年间均呈下降趋势,区内植被在该时间段内退化较为严重。年内NDVI变化呈单峰状,5—8月为植被生长季,1—4月和9—12月为植被非生长季。【结论】该区胡杨年轮生长受5月(P<0.01, 显著负相关)地下水埋深和6月(P<0.01,显著负相关)温度影响显著,而NDVI主要与5—7月(P<0.01, 显著负相关)和10月(P<0.01, 显著负相关)的地下水埋深及7月(P<0.01, 显著负相关)温度有关,且影响NDVI和胡杨年轮指数的主要因子是水热因子中的地下水埋深因子。胡杨年轮指数与NDVI间的相关性差,未能通过0.05水平检验。

Abstract

【Objective】This study evaluated the relationships between tree growth and vegetation remote sensing data. 【Method】Based on the methods and theories of dendrochronology, we used tree-ring index of Populus euphratica, vegetation index(GIMMS NDVI), groundwater depth and meteorological data to analyze characteristics of tree-ring growth of P. euphratica and GIMMS NDVI in the lower reaches of the Tarim River. The correlations between hydrothermal factors, tree-ring index of P. euphratica, and GIMMS NDVI were also analyzed.【Results】 The tree-ring index of P. euphratica and GIMMS NDVI had declined due to vegetative degradation during 1980 and 2001 in the study region. The interannual change of GIMMS NDVI appeared a peak value. During vegetation growing season in the lower reaches of Tarim River, the vegetation growth was the most abundant between May and August while it was declined between January and April, and between September and December.【Conclution】 The tree-ring index of P. euphratica was significantly negatively correlated with groundwater depth in May and temperature in June(P<0.01). However, GIMMS NDVI was significantly negatively correlated with groundwater depth between May and July, and in October. There was a significant negative correlation between GIMMS NDVI and temperature in July. The correlation between the tree-ring index of P. euphratica and GIMMS NDVI was not significant(P<0.05). Thus, groundwater depth was a key factor for P. euphratica growth and GIMMS NDVI change in the lower reaches of the Tarim River.

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汪亮亮，叶茂，高生峰，苟晓霞，徐俏，张同刚. 水热因子对塔里木河下游胡杨年轮指数和植被指数的影响[J]. 南京林业大学学报（自然科学版）. 2017, 41(05): 85-91 https://doi.org/10.3969/j.issn.1000-2006.201609005

WANG Liangliang, YE Mao, GAO Shengfeng, GOU Xiaoxia, XU Qiao, ZHANG Tonggang. Effects of hydrothermal factors on vegetation index and tree-ring index of Populus euphratica in the lower reaches of the Tarim River[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2017, 41(05): 85-91 https://doi.org/10.3969/j.issn.1000-2006.201609005

中图分类号： S718

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