Water Shortage Drives Interactions Between Cushion and Beneficiary Species Along Elevation Gradients in Dry Himalayas

doi:10.1002/2017JG004365

	Water Shortage Drives Interactions Between Cushion and Beneficiary Species Along Elevation Gradients in Dry Himalayas
	Ale, Rita 1; Zhang, Lin ; Li, Xiang 1; Raskoti, Bhakta Bahadur 2; Pugnaire, Francisco I.; Luo, Tianxiang
	2018
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
卷号	123 期号:1 页码:226-238
摘要	It is challenging to understand the drivers of plant-plant interaction patterns in dry mountains. However, such knowledge is important to assess alpine ecosystem resilience to climate change. In water-limited ecosystems, leaf C-13 and satellite-derived vegetation index (NDVI) may serve as reliable indicators of environmental severity to address plant responses to water availability. We hypothesized that in dry mountains, interaction intensity between cushion and beneficiary species increases with increasing C-13 and decreasing NDVI regardless of elevation, indicating the importance of water availability in driving plant interactions. We used relative interaction indices (RII) of species and individual numbers within and outside the canopy of three cushion plant species along three elevational transects in dry Himalayas, Nepal. Site-specific NDVI was calculated from 30m Landsat images. Thornthwaite moisture index was calculated for each elevation site. We observed nonlinear patterns in RII, C-13, and NDVI with elevation. Intraspecific variation of C-13 was negatively correlated with moisture index and NDVI, while NDVI across sites was positively correlated with precipitation but not with temperature. RII within a cushion species was positively correlated with C-13 and negatively with NDVI when the effect of elevation was removed. In pooled data across cushion species and sites, RII was negatively correlated with precipitation and NDVI when the effect of temperature was removed. RII was uncorrelated with cushion size under the same environment. Leaf nitrogen showed no correlation with RII or C-13. Our data show that water shortage is the main driver of plant interactions in the alpine belt of dry Himalayas.
关键词	alpine plants carbon isotope interaction intensity satellite vegetation index stress gradient hypothesis water availability
学科领域	Environmental Sciences ; Geosciences, Multidisciplinary
DOI	10.1002/2017JG004365
收录类别	SCI
语种	英语
WOS关键词	CARBON-ISOTOPE DISCRIMINATION ; PLANT-PLANT INTERACTIONS ; POSITIVE ASSOCIATIONS ; ALTITUDINAL GRADIENTS ; ABIOTIC STRESS ; PRECIPITATION ; DELTA-C-13 ; COMMUNITY ; NDVI ; FACILITATION
WOS记录号	WOS:000425517800017
出版者	AMER GEOPHYSICAL UNION
文献子类	Article
出版地	WASHINGTON
EISSN	2169-8961
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41571046, 31170451] ; Strategic Priority Research Program (B) of the Chinese Academy of SciencesChinese Academy of Sciences [XDB03030402] ; CAS-TWAS fellowship
作者邮箱	luotx@itpcas.ac.cn
引用统计	被引频次：7[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/2S10CLM1/20618
专题	系统与进化植物学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing, Peoples R China 4.Pugnaire, Francisco I.] CSIC, Estn Expt Zonas Aridas, Almeria, Spain
推荐引用方式 GB/T 7714	Ale, Rita,Zhang, Lin,Li, Xiang,et al. Water Shortage Drives Interactions Between Cushion and Beneficiary Species Along Elevation Gradients in Dry Himalayas[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2018,123(1):226-238.
APA	Ale, Rita,Zhang, Lin,Li, Xiang,Raskoti, Bhakta Bahadur,Pugnaire, Francisco I.,&Luo, Tianxiang.(2018).Water Shortage Drives Interactions Between Cushion and Beneficiary Species Along Elevation Gradients in Dry Himalayas.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,123(1),226-238.
MLA	Ale, Rita,et al."Water Shortage Drives Interactions Between Cushion and Beneficiary Species Along Elevation Gradients in Dry Himalayas".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 123.1(2018):226-238.

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