More tree growth reduction due to consecutive drought and its legacy effect for a semiarid larch plantation in Northwest China

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外文摘要：Extreme climate has increasingly led to negative impacts on forest ecosystems globally,especially in semiarid areas where forest ecosystems are more vulnerable.How-ever,it is poorly understood how tree growth is affected by different drought events.In 2006-2009,the larch plantations in the semiarid areas of Northwest China were negatively affected by four consecutive dry years,which was a very rare phenomenon that may occur frequently under future climate warming.In this study,we analyzed the effect of these consecutive dry years on tree growth based on the data of the tree rings in the dominant layer of the forest canopy on a larch plantation.We found that the tree-ring width index(RWI)in dry years was lower than that in nor-mal years,and it experienced a rapidly decreasing trend from 2006 to 2009(slope=-0.139 year-1,r=-0.94)due to water supply deficits in those dry years.Drought induced legacy effects of tree growth reduction,and consecutive dry years corresponded with greater growth reductions and legacy effects.Growth reductions and legacy effects were significantly stronger in the third and fourth consecutive dry years than that of single dry year(p＜0.05),which might have been due to the cumulative stress caused by consecutive dry years.Our results showed that larch trees experienced greater tree growth reduction due to consecutive dry years and their legacy effect,and the trees had lower recovery rates after consecutive dry years.Our results highlight that consecutive dry years pose a new threat to plantations under climate warming,and thus,the effect of climate extremes on tree growth should be considered in growth models in semiarid areas.

外文关键词：

Tree ringsDrought effectsLegacy effectsGrowth-climate relationshipsLarix principis-rupprechtii

作者：

Yanfang Wan、Pengtao Yu、Yanhui Wang、Jiamei Li、Yushi Bai、Yipeng Yu、Bingbing Liu、Xiaocha Wei、Yu Lei

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作者单位：

Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Ecology and Nature Conservation Institute,Chinese Academy of Forestry,Beijing 100091,People's Republic of China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of China

项目编号：

42161144008U21A2005U20A20852022YFF08018042022YFF08018032022YFF1300404

出版年：

2024

DOI：

10.1007/s11676-023-01691-6

林业研究(英文版)

东北林业大学,中国生态学学会

林业研究(英文版)

CSTPCDEI

影响因子：0.365

ISSN：1007-662X

年,卷(期)：2024.35(2)

参考文献量54