气候变化领域集成服务门户(CCPortal): Origin of Intra-annual Density Fluctuations in a Semi-arid Area of Northwestern China

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DOI	10.3389/fpls.2021.777753
	Origin of Intra-annual Density Fluctuations in a Semi-arid Area of Northwestern China
	Gao, Jiani; Rossi, Sergio; Yang, Bao
通讯作者	Yang, B (通讯作者)，Chinese Acad Sci, Northwest Inst Eco Environment & Resources, Key Lab Desert & Desertificat, Lanzhou, Peoples R China. ; Yang, B (通讯作者)，Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China. ; Yang, B (通讯作者)，Qinghai Normal Univ, Qinghai Res Ctr Qilian Mt Natl Pk, Xining, Peoples R China. ; Yang, B (通讯作者)，Acad Plateau Sci & Sustainabil, Qinghai Res Ctr Qilian Mt Natl Pk, Xining, Peoples R China.
发表日期	2021
ISSN	1664-462X
卷号	12
英文摘要	Intra-annual density fluctuation (IADF) is a structural modification of the tree ring in response to fluctuations in the weather. The expected changes in monsoon flow would lead to heterogeneous moisture conditions during the growing season and increase the occurrence of IADF in trees of the arid ecosystems of continental Asia. To reveal the timings and physiological mechanisms behind IADF formation, we monitored cambial activity and wood formation in Chinese pine (Pinus tabuliformis) during 2017-2019 at three sites in semi-arid China. We compared the dynamics of xylem formation under a drought event, testing the hypothesis that drought affects the process of cell enlargement and thus induces the production of IADF. Wood microcores collected weekly from April to October were used for anatomical analyses to estimate the timings of cambial activity, and the phases of enlargement, wall thickening, and lignification of the xylem. The first cells started enlargement from late April to early May. The last latewood cells completed differentiation in mid-September. Trees produced IADF in 2018. During that year, a drought in June limited cell production in the cambium, only 36% of the xylem cells being formed in IADF trees, compared to 68% in normal tree rings. IADF cells enlarged under drought in early July and started wall thickening during the rainfall events of late July. The drought restricted cell enlargement and affected wall thickening, resulting in narrow cells with wide walls. Cambium and cell enlargement recovered from the abundant rainfall, producing a new layer with large earlywood tracheids. IADF is a specific adaptation of trees to cope with water deficit events occurring during xylem formation. Our findings confirmed the hypothesis that the June-July drought induces latewood-like IADFs by limiting the process of cell enlargement in the xylem. Our finding suggests a higher occurrence of IADF in trees of arid and semi-arid climates of continental Asia if the changes to monsoon flows result in more frequent drought events during the earlywood formation in June.
关键词	TREE-RING WIDTH FALSE RINGS GROWING-SEASON WOOD FORMATION PINUS-PINEA GROWTH DROUGHT XYLOGENESIS WATER RECONSTRUCTION
英文关键词	water availability; IADF; xylogenesis; cambial activity; Chinese pine; cell enlargement
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000742960700001
来源期刊	FRONTIERS IN PLANT SCIENCE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254993
作者单位	[Gao, Jiani; Yang, Bao] Chinese Acad Sci, Northwest Inst Eco Environment & Resources, Key Lab Desert & Desertificat, Lanzhou, Peoples R China; [Gao, Jiani] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China; [Gao, Jiani; Rossi, Sergio] Univ Quebec Chicoutimi, Dept Sci Fondament, Chicoutimi, PQ, Canada; [Rossi, Sergio] Chinese Acad Sci, South China Bot Garden, Guangdong Prov Key Lab Appl Bot, Key Lab Vegetat Restorat & Management Degraded Ec, Guangzhou, Peoples R China; [Yang, Bao] Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China; [Yang, Bao] Qinghai Normal Univ, Qinghai Res Ctr Qilian Mt Natl Pk, Xining, Peoples R China; [Yang, Bao] Acad Plateau Sci & Sustainabil, Qinghai Res Ctr Qilian Mt Natl Pk, Xining, Peoples R China
推荐引用方式 GB/T 7714	Gao, Jiani,Rossi, Sergio,Yang, Bao. Origin of Intra-annual Density Fluctuations in a Semi-arid Area of Northwestern China[J]. 中国科学院西北生态环境资源研究院,2021,12.
APA	Gao, Jiani,Rossi, Sergio,&Yang, Bao.(2021).Origin of Intra-annual Density Fluctuations in a Semi-arid Area of Northwestern China.FRONTIERS IN PLANT SCIENCE,12.
MLA	Gao, Jiani,et al."Origin of Intra-annual Density Fluctuations in a Semi-arid Area of Northwestern China".FRONTIERS IN PLANT SCIENCE 12(2021).