Asymmetric competition for light varies across functional groups

doi:10.1038/s41477-017-0060-2

	Asymmetric competition for light varies across functional groups
	Guo, Qiang ; Chi, Xiulian 1; Xie, Zongqiang2 ; Tang, Zhiyao
	2017
发表期刊	JOURNAL OF PLANT ECOLOGY
ISSN	1752-9921
卷号	10 期号:1 页码:74-80
摘要	Aims Asymmetric competition for light may depress the growth rates (GRs) to different extents for different-sized tree individuals. Various responses of different functional groups to light availability result that tree individuals of different functional groups may experience different competition intensities, e.g. canopy and deciduous species grow faster and demand more light than understory and evergreen species. In this study, we estimated the effects of asymmetric competition for light using individual GRs and explored the effects of asymmetric competition on growth among different functional groups (e.g. canopy vs. understory species and deciduous vs. evergreen species). Methods We measured growth in circumference to determine the radial increments of a total of 2233 stems with diameter at breast height >= 5.0 cm in a permanent plot (140 x 80 m(2)) located in a typical evergreen and deciduous broadleaved mixed forest on Mt Shennongjia, China. All of the measurements were carried out at similar to 6-month intervals every April and October from 2012 to 2014, and biomass of each individual was calculated based on its diameter and species-specific allometry. We then calculated GRs of annual biomass growth (growth between October and the next October). Considering the hypothesis that asymmetric competition for light among trees of different sizes may result in a steeper allometric growth curve with increasing tree size, we further divided the sampled trees into different subsets according to their height, at intervals of 1 m, and then fitted the scaling relationship between the logarithm of the biomass GR (logGR) and the logarithm of diameter (logD) for each height class using standardized major axis regression. Finally, we used simple linear regression to test whether the scaling exponent was related to tree height. The above analyses were conducted for the annual growth of all tree species, canopy species, understory vs. treelets species and deciduous vs. evergreen species. Important findings We observed a concave curve for the relationship between logGR and logD with an increase in the scaling exponent between logGR and logD with increasing tree height. This pattern held for the annual growth of canopy species and deciduous species but not for the annual growth of understory species, treelets or evergreen species. These results suggest that asymmetric competition for light is more important in regulating the GRs of the fast-growing species, such as canopy species and deciduous species, than those of shade-tolerant species, such as understory species, treelets and evergreen species.
关键词	asymmetric competition tree height metabolic scaling theory tree growth functional group
学科领域	Plant Sciences
DOI	10.1038/s41477-017-0060-2
收录类别	SCI
语种	英语
WOS关键词	TREE GROWTH ; SHADE TOLERANCE ; RAIN-FOREST ; LEAF ATTRIBUTES ; WOODY-PLANTS ; SIZE ; EVERGREEN ; HEIGHT ; TRAITS ; MODEL
WOS记录号	WOS:000419067900018
出版者	OXFORD UNIV PRESS
文献子类	Article
出版地	OXFORD
EISSN	1752-993X
资助机构	National Program on Key Basic Research ProjectNational Basic Research Program of China [2014CB954004] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31321061, 31470486]
作者邮箱	zytang@urban.pku.edu.cn
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/22229
专题	植被与环境变化国家重点实验室
作者单位	1.Peking Univ, Dept Ecol, Coll Urban & Environm Sci & Key Lab Earth Surface, Minist Educ, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 2.China Acad Chinese Med Sci, Natl Resource Ctr Chinese Mat Medica, Beijing 100700, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 20 Nanxincun, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Guo, Qiang,Chi, Xiulian,Xie, Zongqiang,et al. Asymmetric competition for light varies across functional groups[J]. JOURNAL OF PLANT ECOLOGY,2017,10(1):74-80.
APA	Guo, Qiang,Chi, Xiulian,Xie, Zongqiang,&Tang, Zhiyao.(2017).Asymmetric competition for light varies across functional groups.JOURNAL OF PLANT ECOLOGY,10(1),74-80.
MLA	Guo, Qiang,et al."Asymmetric competition for light varies across functional groups".JOURNAL OF PLANT ECOLOGY 10.1(2017):74-80.

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