文献类型：期刊文献

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

作者：Yanfang Wan[1] Pengtao Yu[1] Yanhui Wang[1] Jiamei Li[1] Yushi Bai[1] Yipeng Yu[1] Bingbing Liu[1] Xiaocha Wei[1]

第一作者：Yanfang Wan

机构：[1]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

年份：2024

卷号：35

期号：2

起止页码：188-196

中文期刊名：Journal of Forestry Research

外文期刊名：林业研究（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2023_2024】；PubMed;

基金：the National Natural Science Foundation of China(Nos.42161144008;U21A2005;U20A2085);the National Key Research and Development Program of China(2022YFF0801804;2022YFF0801803;2022YFF1300404)。

语种：英文

中文关键词：Tree rings;Drought effects;Legacy effects;Growth-climate relationships;Larix principis-rupprechtii

分类号：S718.55

摘要：Extreme climate has increasingly led to negative impacts on forest ecosystems globally,especially in semiarid areas where forest ecosystems are more vulnerable.However,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 normal 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.