干旱区生态环境知识资源中心(Arid): Grow wider canopies or thicker stems: Variable response of woody plants to increasing dryness

Arid

DOI	10.1111/geb.13212
	Grow wider canopies or thicker stems: Variable response of woody plants to increasing dryness
	Ding, Jingyi; Travers, Samantha K.; Eldridge, David J.
通讯作者	Eldridge, DJ
来源期刊	GLOBAL ECOLOGY AND BIOGEOGRAPHY
ISSN	1466-822X
EISSN	1466-8238
出版年	2021
卷号	30 期号:1 页码:183-195
英文摘要	Aim Woody plants vary greatly from tall trees to branching shrubs with increasing dryness. Variation in plant allometry is driven by both biotic and abiotic factors, reflecting different plant adaptation strategies in different environments. Here, we explore how aboveground allometry of different woody plants responds to increasing dryness along an extensive aridity gradient. Location Eastern Australia. Time period 2018-2019. Major taxa studied Woody plants. Methods We surveyed the aboveground allometry of woody plants (e.g., canopy, height, stem diameter, branches) at 150 sites along a 1,500-km aridity gradient from humid to arid areas. We used regression analyses and structural equation modelling to explore the variation in woody allometry with increasing aridity, and the abiotic (resource availability) and biotic (aboveground competition) mechanisms driving such changes. Results Plant height declined, but branching, canopy width and canopy depth increased with increasing aridity. Woody responses to dryness varied among genera, with increasing aridity associated with wider canopies in Eucalyptus and Callitris spp., thicker stems in Acacia spp., but no clear differences in Allocasuarina spp. Biotic and abiotic factors exerted different effects on the allometry of different genera, with Eucalyptus and Callitris spp. constrained by resource availability, while Acacia and Allocasuarina spp. were regulated mainly by aboveground competition. Main conclusions As aridity increased, we found genus-specific responses in allometric changes and driving mechanisms (resource availability cf. aboveground competition). Rather than merely shrinking in size, our results suggest that woody plants allocate resources to either canopies or stems to cope with increasing dryness. Increasing stem or canopy size, and altering branching might be a useful strategy for woody plants to compensate for biomass reduction and maintain functions while growing shorter under hotter and drier climates.
英文关键词	aboveground allometry aboveground competition allometric variation aridity gradient climate change adaptation resource availability stress trade‐ off hypothesis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000588708100001
WOS关键词	RAINFALL GRADIENT ; ISOTOPE RATIOS ; TREE ALLOMETRY ; EUCALYPTUS ; BIOMASS ; FOREST ; CARBON ; LEAF ; PATTERNS ; SAVANNA
WOS类目	Ecology ; Geography, Physical
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327985
作者单位	[Ding, Jingyi; Travers, Samantha K.; Eldridge, David J.] Univ New South Wales, Sch Biol Earth & Environm Sci, Ctr Ecosyst Sci, Sydney, NSW 2052, Australia
推荐引用方式 GB/T 7714	Ding, Jingyi,Travers, Samantha K.,Eldridge, David J.. Grow wider canopies or thicker stems: Variable response of woody plants to increasing dryness[J],2021,30(1):183-195.
APA	Ding, Jingyi,Travers, Samantha K.,&Eldridge, David J..(2021).Grow wider canopies or thicker stems: Variable response of woody plants to increasing dryness.GLOBAL ECOLOGY AND BIOGEOGRAPHY,30(1),183-195.
MLA	Ding, Jingyi,et al."Grow wider canopies or thicker stems: Variable response of woody plants to increasing dryness".GLOBAL ECOLOGY AND BIOGEOGRAPHY 30.1(2021):183-195.