Below-ground determinants and ecological implications of shrub species' degree of isohydry in subtropical pine plantations

doi:10.1111/nph.16502

	Below-ground determinants and ecological implications of shrub species' degree of isohydry in subtropical pine plantations
	Jiang, Peipei 1,2; Meinzer, Frederick C.3; Wang, Huimin 1,2; Kou, Liang 1,2; Dai, Xiaoqin 1,2; Fu, Xiaoli 1,2
刊名	NEW PHYTOLOGIST
	2020-06-01
卷号	226 期号:6 页码:1656-1666
关键词	deep soil water uptake hydraulic conductance resource-use efficiency shallow absorptive root water storage
ISSN号	0028-646X
DOI	10.1111/nph.16502
通讯作者	Fu, Xiaoli(fuxl@igsnrr.ac.cn)
英文摘要	The degree of plant iso/anisohydry is a popular framework for characterising species-specific drought responses. However, we know little about associations between below-ground and above-ground hydraulic traits as well as the broader ecological implications of this framework. For 24 understory shrub species in seasonally dry subtropical coniferous plantations, we investigated contributions of the degree of isohydry to species' resource economy strategies, abundance, and importance value, and quantified the hydraulic conductance (K-h) of above-ground and below-ground organs, magnitude of deep water acquisition (WA(deep)), shallow absorptive root traits (diameter, specific root length, tissue density), and resource-use efficiencies (A(max), maximum photosynthesis rate; PNUE, photosynthetic nitrogen-use efficiency). The extreme isohydric understory species had lower wood density (a proxy for higher growth rates) because their higher WA(deep) and whole-plant K-h allowed higher A(max) and PNUE, and thus did not necessarily show lower abundance and importance values. Although species' K-h was coordinated with their water foraging capacity in shallow soil, the more acquisitive deep roots were more crucial than shallow roots in shaping species' extreme isohydric behaviour. Our results provide new insights into the mechanisms through which below-ground hydraulic traits, especially those of deep roots, determine species' degree of isohydry and economic strategies.
资助项目	National Natural Science Foundations of China[31730014] ; National Natural Science Foundations of China[41671224] ; National Natural Science Foundations of China[41830646]
WOS关键词	ROOT XYLEM EMBOLISM ; HYDRAULIC TRAITS ; WATER-UPTAKE ; DOUGLAS-FIR ; SPATIAL-DISTRIBUTION ; TROPICAL FORESTS ; GLOBAL CHANGE ; LIFE-HISTORY ; DROUGHT ; MORTALITY
WOS研究方向	Plant Sciences
语种	英语
出版者	WILEY
WOS记录号	WOS:000531690900001
资助机构	National Natural Science Foundations of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/159778]
专题	中国科学院地理科学与资源研究所
通讯作者	Fu, Xiaoli
作者单位	1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Qianyanzhou Ecol Res Stn, Beijing 100101, Peoples R China 3.US Forest Serv, USDA, Pacific Northwest Res Stn, Corvallis, OR 97331 USA
推荐引用方式 GB/T 7714	Jiang, Peipei,Meinzer, Frederick C.,Wang, Huimin,et al. Below-ground determinants and ecological implications of shrub species' degree of isohydry in subtropical pine plantations[J]. NEW PHYTOLOGIST,2020,226(6):1656-1666.
APA	Jiang, Peipei,Meinzer, Frederick C.,Wang, Huimin,Kou, Liang,Dai, Xiaoqin,&Fu, Xiaoli.(2020).Below-ground determinants and ecological implications of shrub species' degree of isohydry in subtropical pine plantations.NEW PHYTOLOGIST,226(6),1656-1666.
MLA	Jiang, Peipei,et al."Below-ground determinants and ecological implications of shrub species' degree of isohydry in subtropical pine plantations".NEW PHYTOLOGIST 226.6(2020):1656-1666.