Correlation between leaf size and hydraulic architecture in five compound-leaved tree species of a temperate forest in NE China

doi:10.1016/j.foreco.2017.08.005

IMR OpenIR

	Correlation between leaf size and hydraulic architecture in five compound-leaved tree species of a temperate forest in NE China
	Song, Jia 1,2; Yang, Da 1,2; Niu, Cun-Yang 1,2; Zhang, Wei-Wei 1; Wang, Miao 1; Hao, Guang-You 1
通讯作者	Hao, Guang-You(haogy@iae.ac.cn)
	2018-06-01
发表期刊	FOREST ECOLOGY AND MANAGEMENT
ISSN	0378-1127
卷号	418 页码:63-72
摘要	The divergence between simple and compound leaf form is a fundamental division in leaf architecture that has great impact on environmental adaptations of plants. Two hypotheses regarding the adaptive significance of compound leaf form have long been hypothesized: (1) it enables trees to have higher growth rates under favorable environmental conditions; (2) it contributes to better adaptation to seasonal and unpredictable drought stresses since dropping the whole leaf units could function as a protective mechanism of hydraulic segmentation and hence avoiding diebacks of the more carbon costly stems. These hypotheses, however, have not been firmly supported by mechanistic studies on the underlying physiology and more importantly the inter-specific variations within this functional group in relation to these two proposed hypotheses have largely been overlooked. In the present study, using a common garden setup we investigated the impact of leaf size, an important characteristic of leaf architecture, on xylem hydraulics and carbon economy of five commonly found sympatric compound-leaved tree species from a typical temperate forest of NE China. We specifically tested the hypotheses that larger compound leaf size would be associated with higher hydraulic conductance, increased efficiency of carbon assimilation and greater degree of hydraulic segmentation. Our results showed that the majority of the hydraulic resistance in shoots was allocated to leaf lamina (53-77% among the five species) and the compound leaf petiole only accounts for a small portion of the shoot hydraulic resistance (9-24%). Both stem hydraulic conductivity and whole-shoot hydraulic conductance showed strong positive correlations with compound leaf size contributing to significantly higher carbon assimilation efficiency in species with larger leaf sizes. The magnitude of water potential drop across transpiring leaves showed a strong positive correlation with leaf size resulting in less negative stem xylem water potential in species with larger leaf sizes, which supports our hypothesis that larger compound leaf enhances hydraulic segmentation. Our results also showed that the advantages associated with larger leaf size can be traded off by a greater susceptibility to freeze-thaw induced hydraulic dysfunction. Besides a deeper understanding of the environmental adaptation of compound-leaved tree species, these findings may contribute to a better utilization of this important type of trees in forestry.
关键词	Compound-leaved tree species Fast growth hypothesis Hydraulic segmentation hypothesis Hydraulic-photosynthetic coordination Temperate forest
资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Hundred-Talents Program ; Chinese Academy of Sciences
DOI	10.1016/j.foreco.2017.08.005
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2016YFA0600803] ; National Natural Science Foundation of China[31722013] ; National Natural Science Foundation of China[31500222] ; Hundred-Talents Program ; Chinese Academy of Sciences[QYZDJ-SSW-DQC027]
WOS研究方向	Forestry
WOS类目	Forestry
WOS记录号	WOS:000432498500009
出版者	ELSEVIER SCIENCE BV
引用统计	被引频次：19[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/128488
专题	中国科学院金属研究所
通讯作者	Hao, Guang-You
作者单位	1.Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, 72 Wenhua Rd, Shenyang, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Song, Jia,Yang, Da,Niu, Cun-Yang,et al. Correlation between leaf size and hydraulic architecture in five compound-leaved tree species of a temperate forest in NE China[J]. FOREST ECOLOGY AND MANAGEMENT,2018,418:63-72.
APA	Song, Jia,Yang, Da,Niu, Cun-Yang,Zhang, Wei-Wei,Wang, Miao,&Hao, Guang-You.(2018).Correlation between leaf size and hydraulic architecture in five compound-leaved tree species of a temperate forest in NE China.FOREST ECOLOGY AND MANAGEMENT,418,63-72.
MLA	Song, Jia,et al."Correlation between leaf size and hydraulic architecture in five compound-leaved tree species of a temperate forest in NE China".FOREST ECOLOGY AND MANAGEMENT 418(2018):63-72.