DOI: 10.1029/2018JG004485
Scopus记录号: 2-s2.0-85049842644
论文题名: The Impact of Drought on Native Southern California Vegetation: Remote Sensing Analysis Using MODIS-Derived Time Series
作者: Okin G.S. ; Dong C. ; Willis K.S. ; Gillespie T.W. ; MacDonald G.M.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 6 起始页码: 1927
结束页码: 1939
语种: 英语
英文关键词: bootstrapping
; California
; chaparral
; coastal sage scrub
; drought
; NDVI
Scopus关键词: bootstrapping
; chaparral
; climate change
; correlation
; drought
; Mediterranean environment
; MODIS
; native species
; NDVI
; plant community
; remote sensing
; scrub
; time series analysis
; vegetation type
; California
; United States
英文摘要: Ecosystems in Mediterranean climates are adapted to seasonal drought. Multiannual drought, however, may significantly affect Mediterranean ecosystems and, further, may affect their constituent communities in different ways with differences in responses emerging during severe drought and over the course of long-term climate change. This study investigates the response to recent prolonged drought of two important Mediterranean-climate vegetation types: chaparral and coastal sage scrub. Their greenness was monitored from 2000 to 2017 using the Normalized Difference Vegetation Index (NDVI) derived from the Moderate Resolution Imaging Spectroradiometer. A bootstrapped multiple regression of NDVI anomalies against Palmer Drought Severity Index was used to assess the response of vegetation to drought. The results suggest that drought had a greater effect on chaparral-dominated ecosystems than coastal sage over the entire region. Shallow-rooted coastal sage scrub displayed higher interannual variability in NDVI than chaparral but had a lower correlation with Palmer Drought Severity Index. This suggests that this vegetation community is generally less responsive to drought on longer timescales than chaparral, which may be more sensitive to soil water depletion in a prolonged drought. Soil texture plays a critical role in affecting the community sensitivity to drought. For chaparral communities, elevation is negatively correlated with drought sensitivity, suggesting the role of temperature-related water stress on their long-term response to drought. Future predicted climate change in the form of increased temperature and drought hazards in Southern California will influence the native ecosystems in nonuniform ways. Long-term trends in soil moisture depletion and temperature may be particularly important in chaparral-dominated areas. ©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/113810
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geography, University of California, Los Angeles, Los Angeles, CA, United States
Recommended Citation:
Okin G.S.,Dong C.,Willis K.S.,et al. The Impact of Drought on Native Southern California Vegetation: Remote Sensing Analysis Using MODIS-Derived Time Series[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(6)