Arid
DOI10.1016/j.jaridenv.2017.02.005
Rainfall validates MODIS-derived NDVI as an index of spatio-temporal variation in green biomass across non-montane semi-arid and arid Central Asia
Formica, Adam E.; Burnside, Robert J.; Dolman, Paul M.
通讯作者Formica, Adam E.
来源期刊JOURNAL OF ARID ENVIRONMENTS
ISSN0140-1963
EISSN1095-922X
出版年2017
卷号142页码:11-21
英文摘要

As satellite-derived normalized difference vegetation index (NDVI) is related to vegetation biomass, it may provide a proxy for habitat quality across extensive species ranges where ground-truth data are scarce. However, NDVI may have limited accuracy in sparsely-vegetated arid and semi-arid environments due to signal contamination by substrate reflectance. To validate NDVI as a vegetation proxy in the low altitude deserts of Central Asia, we examine its response to precipitation across the migratory corridor of Asian Houbara Chlamydotis macqueenii, a threatened gamebird occupying deserts from the Middle East to China. Restricting NDVI data by altitude (masking higher elevations unoccupied by n = 61 satellite tracked houbara) and 2009 Globcover land cover (excluding cropland and built-up area), we relate moderate-resolution imaging spectroradiometer (MODIS) NDVI data to Global Precipitation Climatology Project precipitation data across five World Wildlife Fund semi-arid ecoregions (totaling 4.06 million km(2)). We examine this both spatially (per 1 cell, mean annual NDVI and mean precipitation over 16 years, 2000-2015); and temporally (annual NDVI and annual precipitation) using separate temporal General Linear Models per cell and an overall Generalized Linear Mixed Model (GLMM) (including cell ID as a random effect). We sought to explain spatial variation in the NDVI-precipitation relation among temporal per degree-cell models, in terms of the slope (strength) and adjusted (adj.) R-2 (explanatory power), using inter-annual mean NDVI (2000-2015) and Gridded Livestock of the World livestock density. NDVI increases with precipitation, both spatially (adj. R-2 = 0.58, p < 0.001) and temporally (mean adj. R-2 across n = 244,1 cells = 0.44; GLMM across cells p < 0.001). More vegetated regions show a stronger temporal response of vegetation biomass for a given precipitation increment (slope of NDVI to precipitation in per cell temporal models increases with inter-annual mean NDVI; adj. R-2 = 0.38, p < 0.001), reinforcing the conclusion that NDVI provides a proxy for vegetation abundance. The slope of this relation did not differ among ecoregions. Although livestock density is generally assumed to degrade vegetation and weaken the NDVI-precipitation relationship, explanatory power (adj. R-2 of per cell NDVI-precipitation models) is weakly, but positively, related to livestock density (adj. R-2 = 0.02, p = 0.011). This may be because we assess livestock at a coarse grain, at scales where overall stocking density is positively associated with vegetation abundance, but may also indicate that livestock are not degrading vegetation at regional landscape-scales despite potential localized effects. The strong signature of rainfall shows MODIS NDVI offers a potentially powerful proxy for spatial and temporal variation in arid and semi-arid vegetation at a resolution of 1 and 1 year over the houbara’s breeding and wintering range, and probably also at finer spatial resolutions. NDVI can therefore be used in analyses relating (a) staging and wintering site selection to variation in habitat among potential wintering locations, and (b) variation within and between localities to demographic carry-over effects. (C) 2017 Elsevier Ltd. All rights reserved.


英文关键词NDVI Validation Precipitation Asian Houbara Extensive grazing Pastoralism
类型Article
语种英语
国家England
收录类别SCI-E
WOS记录号WOS:000401675200002
WOS关键词ECOLOGICAL CONDITIONS ; VEGETATION INDEX ; MIGRATORY BIRD ; PRECIPITATION ; DESERTIFICATION ; VARIABILITY ; PERFORMANCE ; RESPONSES ; SURVIVAL ; CANOPY
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/200106
作者单位Univ East Anglia, Sch Environm Sci, Norwich Res Pk, Norwich NR4 7TJ, Norfolk, England
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Formica, Adam E.,Burnside, Robert J.,Dolman, Paul M.. Rainfall validates MODIS-derived NDVI as an index of spatio-temporal variation in green biomass across non-montane semi-arid and arid Central Asia[J],2017,142:11-21.
APA Formica, Adam E.,Burnside, Robert J.,&Dolman, Paul M..(2017).Rainfall validates MODIS-derived NDVI as an index of spatio-temporal variation in green biomass across non-montane semi-arid and arid Central Asia.JOURNAL OF ARID ENVIRONMENTS,142,11-21.
MLA Formica, Adam E.,et al."Rainfall validates MODIS-derived NDVI as an index of spatio-temporal variation in green biomass across non-montane semi-arid and arid Central Asia".JOURNAL OF ARID ENVIRONMENTS 142(2017):11-21.
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