地理研究 ›› 2019, Vol. 38 ›› Issue (4): 822-830.doi: 10.11821/dlyj020180049

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20世纪以来美国树木生长响应气候变化敏感度的时空差异

白孟鑫1,2(), 郑景云1,2, 郝志新1,2, 张学珍1,2()   

  1. 1. 中国科学院地理科学与资源研究所,中国科学院陆地表层格局与模拟重点实验室,北京100101
    2. 中国科学院大学,北京100049
  • 收稿日期:2018-01-10 修回日期:2018-05-06 出版日期:2019-04-20 发布日期:2019-04-30
  • 作者简介:

    作者简介:白孟鑫(1993-),男,河南周口人,硕士,主要从事气候变化研究。E-mail: baimx.16s@igsnrr.ac.cn

  • 基金资助:
    国家重点研发计划项目(2017YFA0603301);国家自然科学基金项目(41471171);中国科学院地理科学与资源研究所杰出青年人才基金项目(2015RC101);中国科学院青年创新促进会(2015038)

Spatiotemporal variation of the response of tree radial growth and its sensitivities to climate changes in the United States since the 20th century

Mengxin BAI1,2(), Jingyun ZHENG1,2, Zhixin HAO1,2, Xuezhen ZHANG1,2()   

  1. 1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-01-10 Revised:2018-05-06 Online:2019-04-20 Published:2019-04-30

摘要:

树木生长响应气候变化的敏感度是全球变化研究的重要内容。利用20世纪以来美国本土1058个样本点的树轮宽度指数和温度、降水数据,通过相关分析,揭示了树木生长速率年际变化响应气候变化敏感度的时空差异。研究发现:① 美国树木径向生长速率与温度普遍负相关、与降水普遍正相关,绝大多数地区树木生长受水分条件限制。② 径向生长速率对温度和降水响应敏感度呈现一定的季节差异,最敏感的季节因地区而异,这主要与不同月份温度、降水条件差异导致的水分条件变化有关。同时,径向生长速率对温度、降水响应敏感度还随着气候条件变化而变化,随着年平均温度升高(降低),径向生长速率与温度的负相关逐渐增强(减弱),随着年降水增加(减少),与降水的正相关强度逐渐减弱(增强)。

关键词: 美国, 树木生长, 气候变化, 敏感度, 20世纪

Abstract:

The response of tree radial growth and its sensitivity to climate change is an important topic in the global environmental research community. Using tree-ring width index data from 1058 sample sites in the United States and instrumental temperature and precipitation data since the 20th century, correlation analysis was carried out to reveal the spatiotemporal variation of tree radial growth's response and its sensitivity to climate changes. Results show that in the United States radial growth rates of trees were mostly negative correlated with temperature and positive correlated with precipitation. Moisture may be dominant limiting factor of tree growth in most of regions of the United States. Response sensitivity of tree radial growth rate to temperature and precipitation changes exhibited seasonal variations. The most sensitive season varies with regions. The spatial variability of most sensitive seasons was mainly resulted from seasonal variations of moisture conditions due to local seasonal cycles of temperature and precipitation. Moreover, the response sensitivities of tree radial growth rate to temperature and precipitation changes along with climate changes. The negative correlation between tree radial growth rate with temperature would be strengthened (weakened) along with the climate warming (cooling). The positive correlation between tree radial growth rate with precipitation would be strengthened (weakened) along with precipitation decrease (increase).

Key words: the United States, tree growth, climate change, sensitivity, 20th century