气候变化领域集成服务门户(CCPortal): Precipitation and relative humidity favours tree growth while air temperature and relative humidity respectively drive winter stem shrinkage and expansion

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DOI	10.3389/ffgc.2024.1368590
	Precipitation and relative humidity favours tree growth while air temperature and relative humidity respectively drive winter stem shrinkage and expansion
	Oogathoo, Shalini; Duchesne, Louis; Houle, Daniel; Kneeshaw, Daniel; Belanger, Nicolas
发表日期	2024
EISSN	2624-893X
起始页码	7
卷号	7
英文摘要	Forest ecosystems have a major role in sequestering atmospheric CO2 and as such, their resilience is of upmost importance. In the boreal forest, trees grow only during a short period when air temperature is favourable. During winter, trees have specific mechanisms to survive in the cold air temperature. In order to understand the response of trees to a changing climate, this study assessed the influence of environmental variables on three phases of tree radial variation (i.e., growth, shrinkage and expansion) during three periods of the year (i.e., growing season, freeze-thaw period, and winter). The three phases were extracted from stem radial variation measured for as much as 11 years on 12 balsam fir [Abies balsamea (L.) Mill.] trees located in a cold and humid boreal forest of eastern Canada. The random forest algorithm was used to model each phase during each period. Our results show that tree growth increased with high precipitation and high relative humidity. Stem shrinkage was affected mostly by solar radiation, precipitation and vapour pressure deficit during the growing season and was likely caused by tree transpiration. During both the freeze-thaw and winter season periods, stem shrinkage increased with decreasing air temperature. During the growing season, stem expansion was related to 1-day-lag solar radiation and 1-day-lag vapour pressure deficit, which are the same variables associated with shrinkage the preceding day. Stem expansion increased with increasing air temperature and relative humidity during the freeze-thaw and winter season periods, respectively. This study shows that sink-driven tree growth is promoted mostly under humid conditions while antecedent dry and warm conditions are required during the growing season for trees to assimilate carbon through photosynthesis.
英文关键词	point dendrometer; tree growth; stem shrinkage; stem expansion; boreal forest; environmental variables
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Forestry
WOS类目	Ecology ; Forestry
WOS记录号	WOS:001206670600001
来源期刊	FRONTIERS IN FORESTS AND GLOBAL CHANGE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302311
作者单位	University of Quebec; University of Quebec Montreal; University of Quebec; Universite TELUQ; Environment & Climate Change Canada
推荐引用方式 GB/T 7714	Oogathoo, Shalini,Duchesne, Louis,Houle, Daniel,et al. Precipitation and relative humidity favours tree growth while air temperature and relative humidity respectively drive winter stem shrinkage and expansion[J],2024,7.
APA	Oogathoo, Shalini,Duchesne, Louis,Houle, Daniel,Kneeshaw, Daniel,&Belanger, Nicolas.(2024).Precipitation and relative humidity favours tree growth while air temperature and relative humidity respectively drive winter stem shrinkage and expansion.FRONTIERS IN FORESTS AND GLOBAL CHANGE,7.
MLA	Oogathoo, Shalini,et al."Precipitation and relative humidity favours tree growth while air temperature and relative humidity respectively drive winter stem shrinkage and expansion".FRONTIERS IN FORESTS AND GLOBAL CHANGE 7(2024).