DOI: 10.1002/2017JG004365
Scopus记录号: 2-s2.0-85042233916
论文题名: Water Shortage Drives Interactions Between Cushion and Beneficiary Species Along Elevation Gradients in Dry Himalayas
作者: Ale R. ; Zhang L. ; Li X. ; Raskoti B.B. ; Pugnaire F.I. ; Luo T.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 1 起始页码: 226
结束页码: 238
语种: 英语
英文关键词: alpine plants
; carbon isotope
; interaction intensity
; satellite vegetation index
; stress gradient hypothesis
; water availability
Scopus关键词: adaptation
; alpine environment
; bioclimatology
; canopy
; carbon isotope
; climate change
; correlation
; ecological theory
; ecosystem resilience
; elevation
; environmental gradient
; environmental stress
; Landsat
; moisture
; mountain region
; NDVI
; plant
; plant water relations
; satellite imagery
; water availability
; Himalayas
; Nepal
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 δ13C 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 δ13C 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 30 m Landsat images. Thornthwaite moisture index was calculated for each elevation site. We observed nonlinear patterns in RII, δ13C, and NDVI with elevation. Intraspecific variation of δ13C 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 δ13C 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 δ13C. Our data show that water shortage is the main driver of plant interactions in the alpine belt of dry Himalayas. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114795
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China; Estación Experimental de Zonas Áridas, Consejo Superior de Investigaciones Científicas, Almería, Spain
Recommended Citation:
Ale R.,Zhang L.,Li X.,et al. Water Shortage Drives Interactions Between Cushion and Beneficiary Species Along Elevation Gradients in Dry Himalayas[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(1)