气候变化领域集成服务门户(CCPortal): Water Shortage Drives Interactions Between Cushion and Beneficiary Species Along Elevation Gradients in Dry Himalayas

CCPortal

DOI	10.1002/2017JG004365
	Water Shortage Drives Interactions Between Cushion and Beneficiary Species Along Elevation Gradients in Dry Himalayas
	Ale, Rita; Zhang, Lin; Li, Xiang; Raskoti, Bhakta Bahadur; Pugnaire, Francisco I.; Luo, Tianxiang
通讯作者	Luo, TX (通讯作者)
发表日期	2018
ISSN	2169-8953
EISSN	2169-8961
起始页码	226
结束页码	238
卷号	123 期号:1
英文摘要	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	CARBON-ISOTOPE DISCRIMINATION PLANT-PLANT INTERACTIONS POSITIVE ASSOCIATIONS ALTITUDINAL GRADIENTS ABIOTIC STRESS PRECIPITATION DELTA-C-13 COMMUNITY NDVI FACILITATION
英文关键词	alpine plants; carbon isotope; interaction intensity; satellite vegetation index; stress gradient hypothesis; water availability
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:000425517800017
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259259
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]. 中国科学院青藏高原研究所,2018,123(1).
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).
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).