Elevation and Climate Effects on Vegetation Greenness in an Arid Mountain-Basin System of Central Asia

Mountain-basin systems (MBS) in Central Asia are unique and complex ecosystems, wherein their elevation gradients lead to high spatial heterogeneity in vegetation and its response to climate change. Exploring elevation-dependent vegetation greenness variation and the effects of climate factors on ve...

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Vydáno v:Remote sensing (Basel, Switzerland) Ročník 12; číslo 10; s. 1665
Hlavní autoři: Tai, Xiaoli, Epstein, Howard E., Li, Bo
Médium: Journal Article
Jazyk:angličtina
Vydáno: Basel MDPI AG 01.05.2020
Témata:
altitude
Aridity
Bins
Carbon
Central Asia
China
Climate change
Climate effects
climatic factors
data collection
Deserts
Drying
Ecosystems
Elevation
Grasslands
Greening
Heterogeneity
moderate resolution imaging spectroradiometer
MODIS NDVI
mountain-basin system
Mountains
normalized difference vegetation index
Normalized difference vegetative index
oases
Precipitation
Remote observing
Remote sensing
Spatial heterogeneity
spatial variation
Studies
summer
temperature
Vegetation
Vegetation effects
vegetation greenness
Vegetation index
Wetting
Central Asia
China
Xinjiang China
ISSN:2072-4292, 2072-4292
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Shrnutí:Mountain-basin systems (MBS) in Central Asia are unique and complex ecosystems, wherein their elevation gradients lead to high spatial heterogeneity in vegetation and its response to climate change. Exploring elevation-dependent vegetation greenness variation and the effects of climate factors on vegetation has important theoretical and practical significance for regulating the ecological processes of this system. Based on the MODIS NDVI (remotely sensed normalized difference vegetation index), and observed precipitation and temperature data sets, we analyzed vegetation greenness and climate patterns and dynamics with respect to elevation (300–3600 m) in a typical MBS, in Altay Prefecture, China, during 2000–2017. Results showed that vegetation exhibited a greening (NDVI) trend for the whole region, as well as the mountain, oasis and desert zones, but only the desert zone reached significant level. Vegetation in all elevation bins showed greening, with significant trends at 400–700 m and 2600–3500 m. In summer, lower elevation bins (below 1500 m) had a nonsignificant wetting and warming trend and higher elevation bins had a nonsignificant drying and warming trend. Temperature trend increased with increasing elevation, indicating that warming was stronger at higher elevations. In addition, precipitation had a significantly positive coefficient and temperature a nonsignificant coefficient with NDVI at both regional scale and subregional scale. Our analysis suggests that the regional average could mask or obscure the relationship between climate and vegetation at elevational scale. Vegetation greenness had a positive response to precipitation change in all elevation bins, and had a negative response to temperature change at lower elevations (below 2600 m), and a positive response to temperature change at higher elevations. We observed that vegetation greenness was more sensitive to precipitation than to temperature at lower elevations (below 2700 m), and was more sensitive to temperature at higher elevations.
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ISSN:2072-4292
2072-4292
DOI:10.3390/rs12101665