干旱区生态环境知识资源中心(Arid): Leafing intensity decreases with increasing water table depth and plant height in Populus euphratica, a desert riparian species

Arid

DOI	10.1016/j.actao.2020.103672
	Leafing intensity decreases with increasing water table depth and plant height in Populus euphratica, a desert riparian species
	Han, Lu; He, Dong
通讯作者	He, D
来源期刊	ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY
ISSN	1146-609X
EISSN	1873-6238
出版年	2020
卷号	109
英文摘要	Leafing intensity, which refers to the number of leaves per unit shoot size, is a key architectural trait that is closely linked to plant hydraulics. However, it remains unclear how leafing intensity is regulated by deeper water tables and greater plant heights (i.e., with both necessitating longer hydraulic paths to foliage). As there are diminishing photosynthetic returns from incrementally increased hydraulic support costs with longer hydraulic paths, we predict that leafing intensity would decrease accordingly. To test the prediction, we examined the hydraulic constraints on leafing intensity in a desert riparian species, Populus euphratica. We sampled 1863 shoots from 96 trees with varying heights at contrasting water table depths along the Tarim River corridor in Northwest China. Results showed that midday shoot water potentials decreased with water table depth and plant height. P. euphratica trees had fewer leaves for a given shoot length with deeper water tables, while the increase in leaf number per unit increment of shoot length was constant across water table levels. Although the increase in leaf number per unit increment of shoot length was slightly higher in tall P. euphratica trees, they had fewer leaves at the onset of shoot elongation, and at the grand mean of shoot length across height classes. Overall, the lower leafing intensity with increasing water table depth and plant height highlights the role of hydraulic path length in regulating leaf-shoot allometry. These results also suggest the functional significance of leafing intensity in equilibrating photosynthetic gains with water supplies under varying hydraulic constraints, especially for plants inhabiting drylands.
英文关键词	Hydraulic constraint Hydraulic path length Leaf-shoot allometry Phreatophyte Tarim River Tugay vegetation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000592556800017
WOS关键词	GROUNDWATER DEPTH ; TARIM RIVER ; TREE HEIGHT ; TRADE-OFF ; HYDRAULIC COSTS ; LOWER REACHES ; VEGETATION ; PATTERNS ; FORM ; SIZE
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327655
作者单位	[Han, Lu] Xinjiang Prod & Construct Corps Key Lab Protect &, Alar 843300, Peoples R China; [Han, Lu] Tarim Univ, Coll Plant Sci, Alar 843300, Peoples R China; [He, Dong] East China Normal Univ, Sch Ecol & Environm Sci, Shanghai 200241, Peoples R China
推荐引用方式 GB/T 7714	Han, Lu,He, Dong. Leafing intensity decreases with increasing water table depth and plant height in Populus euphratica, a desert riparian species[J],2020,109.
APA	Han, Lu,&He, Dong.(2020).Leafing intensity decreases with increasing water table depth and plant height in Populus euphratica, a desert riparian species.ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY,109.
MLA	Han, Lu,et al."Leafing intensity decreases with increasing water table depth and plant height in Populus euphratica, a desert riparian species".ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY 109(2020).