干旱区生态环境知识资源中心(Arid): An expanded allometric model for crowns of four co-existing desert shrubs

Arid

DOI	10.1007/s00468-019-01869-8
	An expanded allometric model for crowns of four co-existing desert shrubs
	Zheng, Xin-Jun 1,2; Wang, Yu-Gang 1; Wu, Xue 1,2; Ren, Wen 1,2; Wu, Yu 1,3; Li, Yan1 ; Cao, Xun 1,2; Ma, Jie 1; Zhou, Hai 1
通讯作者	Li, Yan
来源期刊	TREES-STRUCTURE AND FUNCTION
ISSN	0931-1890
EISSN	1432-2285
出版年	2019
卷号	33 期号:5 页码:1423-1433
英文摘要	Key messageA new expanded allometric model with two asymptotic biometrics is built, revealing desert shrub crown scaling exponent varies with respect to soil water availability.AbstractMany biological metrics behave asymptotically when facing biophysical and resources constraints. However, simple allometric model (SAM) of power equation does not include any asymptotic variables. Thus, we built a new expanded allometric model (EAM) with two asymptotic independent variables. Then to test EAM statistically valid, we investigated and measured the crown radius and height of four co-existing shrubs species, including Nitraria sibirica, Reaumuria songarica, N. tangutorum and Tamarix ramosissima, at a saline desert site outside an oasis in southeast Junggar Basin, central Eurasia. Additionally, we also measured leaf biomass and leaf water potential, and surveyed soil profiles of water content and fine root to identify how factors influenced shrub crown ontogeny processes in desert ecosystems. The results showed that both SAM and EAM were statistically valid. The invariable scale exponent of crown radius vs. height from SAM reflected the average state of that from EAM, which had the common initial and ultimate values and the respective maximum for the four co-existing species. The crown horizontal extension was prior to vertical growth because the latter was uneconomic and shrub took an avoiding-self-shading strategy. Across the four species, the crown radius at the timing of the crown scaling exponent maximum was positively related to pre-dawn leaf water potential, which increased with plant rooting depth. It demonstrated that soil water availability limited the expansion of the shrub crown area. To sum up, shrubs grow asymptotically in a horizontal crown expansion manner avoiding self-shading and constrained by soil water availability in water-limited ecosystems.
英文关键词	Allometry Asymptotic growth Desert shrub Scaling exponent Soil water availability
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000491468100013
WOS关键词	HYDRAULIC LIMITATION HYPOTHESIS ; TREE HEIGHT ; UNDERSTOREY TREES ; POWER-LAWS ; FOREST ; ARCHITECTURE ; PATTERNS ; GROWTH ; SIZE ; PERSPECTIVE
WOS类目	Forestry
WOS研究方向	Forestry
EI主题词	2019-10-01
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310074
作者单位	1.Chinese Acad Sci, State Key Lab Desert & Oasis Ecol, Fukang Stn Desert Ecol, Xinjiang Inst Ecol & Geog, 818 South Beijing Rd, Urumqi 830011, Xinjiang, Peoples R China; 2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China; 3.Xinjiang Acad Sci & Technol Dev, 395 First Kexue St, Urumqi 830011, Xinjiang, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Xin-Jun,Wang, Yu-Gang,Wu, Xue,et al. An expanded allometric model for crowns of four co-existing desert shrubs[J]. 中国科学院新疆生态与地理研究所,2019,33(5):1423-1433.
APA	Zheng, Xin-Jun.,Wang, Yu-Gang.,Wu, Xue.,Ren, Wen.,Wu, Yu.,...&Zhou, Hai.(2019).An expanded allometric model for crowns of four co-existing desert shrubs.TREES-STRUCTURE AND FUNCTION,33(5),1423-1433.
MLA	Zheng, Xin-Jun,et al."An expanded allometric model for crowns of four co-existing desert shrubs".TREES-STRUCTURE AND FUNCTION 33.5(2019):1423-1433.