Effects of canopy position on climate-growth relationships of Qinghai spruce in the central Qilian mountains, northwestern China

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	Effects of canopy position on climate-growth relationships of Qinghai spruce in the central Qilian mountains, northwestern China
	Wang, Bin; Yu, Pengtao; Yu, Yipeng; Wan, Yanfang; Wang, Yanhui; Zhang, Lei; Wang, Shunli; Wang, Xiao; Liu, Zebin; Xu, Lihong
刊名	DENDROCHRONOLOGIA
	2020-12
卷号	64 页码:1-7
关键词	Biomass growth Canopy position Climate change Qinghai spruce Growth-climate relationships
ISSN号	1125-7865
英文摘要	Northwestern China has experienced dramatic climate change characterized by rapid warming since the 1980s with the warming trend substantially slowing after 2000. Qinghai spruce (Picea crassifolia Kom.), a key tree species in northwest China, has been predicted to be strongly coupled with climate change. However, how the trends in biomass growth change at different canopy positions under climate change and whether climate-growth responses vary with canopy position remain unclear. A total of 222 trees were sampled by a stand-total sampling strategy in the central Qilian Mountains. Trees were assigned to four canopy positions according to height and distance from neighbors: dominant, codominant, intermediate, and suppressed. Our results indicate that trees in dominant and codominant canopy positions dominate the decreasing trend in stand-level biomass from 1980 to 2000 and the increasing trend from 2000-2013, contributing 81.3 % and 86 %, respectively, whereas trees in the intermediate and suppressed canopy positions contributed less. This result was attributed to a more sensitive response of biomass growth in trees in dominant and codominant canopy positions to climate change. From 1980 to 2000, the stronger decreasing trend in biomass growth at dominant and codominant canopy positions is mostly accounted for by increasing temperature. A more pronounced water deficit might have restricted biomass growth more than that at the intermediate and suppressed canopy positions. However, from 2000 to 2013, drought stress was relieved and summer standardized precipitation evapotranspiration index became a leading factor, which promoted the recovery in biomass at dominant and codominant canopy positions. In a word, compared with intermediate and suppressed canopy trees, those in dominant and codominant positions are less resistant to drought, but dominant and codominant canopy position's biomass can recover more when drought stress is relieved. A more robust understanding of canopy-level growth response and resilience to climate change is crucial to fully understand forest growth dynamics under fluctuating climate conditions.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44284]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Wang, Bin,Yu, Pengtao,Yu, Yipeng,et al. Effects of canopy position on climate-growth relationships of Qinghai spruce in the central Qilian mountains, northwestern China[J]. DENDROCHRONOLOGIA,2020,64:1-7.
APA	Wang, Bin.,Yu, Pengtao.,Yu, Yipeng.,Wan, Yanfang.,Wang, Yanhui.,...&Xu, Lihong.(2020).Effects of canopy position on climate-growth relationships of Qinghai spruce in the central Qilian mountains, northwestern China.DENDROCHRONOLOGIA,64,1-7.
MLA	Wang, Bin,et al."Effects of canopy position on climate-growth relationships of Qinghai spruce in the central Qilian mountains, northwestern China".DENDROCHRONOLOGIA 64(2020):1-7.