Climate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest China

Understanding the spatiotemporal patterns of vegetative cover in relation to climate and land uses is essential for effective management of ecology and the environment. In this study, spatial and temporal changes of the normalized difference vegetation index (NDVI) and potential influencing factors...

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Autores principales:	Shanshan Jiang, Xi Chen, Keith Smettem, Tiejun Wang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	NDVI Climate change Land use Mountain vegetation Southwest China Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/337ae0e9bb1a4a8788b396ba8adb8d2b
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spelling	oai:doaj.org-article:337ae0e9bb1a4a8788b396ba8adb8d2b2021-12-01T04:38:17ZClimate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest China1470-160X10.1016/j.ecolind.2020.107193https://doaj.org/article/337ae0e9bb1a4a8788b396ba8adb8d2b2021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20311328https://doaj.org/toc/1470-160XUnderstanding the spatiotemporal patterns of vegetative cover in relation to climate and land uses is essential for effective management of ecology and the environment. In this study, spatial and temporal changes of the normalized difference vegetation index (NDVI) and potential influencing factors were analyzed in different elevations and land uses across southwest China. Results showed: (1) there was a critical elevation of 3400 m, with different NDVI responses to climate and human interventions above and below 3400 m. Below 3400 m, mean NDVI in each land use area and the whole region did not change with elevation due to compensative effects of decreasing cultivated land and increasing woodland and grassland towards high elevations. Above 3400 m, cultivation effectively ceases. NDVI decreased with elevation as alpine plant species shifted from woody trees to alpine grass, primarily related to declining temperature towards high altitudes. (2) NDVI responses to climate change and human activities are also different above and below 3400 m. NDVI below 3400 m increased significantly after 1980s, primarily as a result of reforestation on hillslopes and improved agricultural productivity. Above 3400 m, under climate warming since the 1980s, NDVI did not increase significantly in 1990s and even decreased in 2000s as the consecutive rise of temperature is higher towards higher altitudes in the 2000s. (3) The area-weighted NDVIs illustrated that from 1980s to 2000s, the increased mean NDVI in the whole region arose from contributions of 20.93, 60.66 and 18.41% changes in NDVIs in cultivated land, woodland and grassland, respectively. In 2000s, the proportion of the woody trees contribution to NDVI increased due to reforestation in the low elevation area (<3400 m), but decreased due to shift of the woody trees to alpine grass under the consecutive climate warming in the high elevation area (>3400 m). The decease of NDVI in the high elevations did not alter increasing trend of NDVI across the whole region during 1982–2015. However, in future, the greening could diminish or even cease as climate warming continues and effects of artificially managed ecological restoration reduce.Shanshan JiangXi ChenKeith SmettemTiejun WangElsevierarticleNDVIClimate changeLand useMountain vegetationSouthwest ChinaEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107193- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	NDVI Climate change Land use Mountain vegetation Southwest China Ecology QH540-549.5
spellingShingle	NDVI Climate change Land use Mountain vegetation Southwest China Ecology QH540-549.5 Shanshan Jiang Xi Chen Keith Smettem Tiejun Wang Climate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest China
description	Understanding the spatiotemporal patterns of vegetative cover in relation to climate and land uses is essential for effective management of ecology and the environment. In this study, spatial and temporal changes of the normalized difference vegetation index (NDVI) and potential influencing factors were analyzed in different elevations and land uses across southwest China. Results showed: (1) there was a critical elevation of 3400 m, with different NDVI responses to climate and human interventions above and below 3400 m. Below 3400 m, mean NDVI in each land use area and the whole region did not change with elevation due to compensative effects of decreasing cultivated land and increasing woodland and grassland towards high elevations. Above 3400 m, cultivation effectively ceases. NDVI decreased with elevation as alpine plant species shifted from woody trees to alpine grass, primarily related to declining temperature towards high altitudes. (2) NDVI responses to climate change and human activities are also different above and below 3400 m. NDVI below 3400 m increased significantly after 1980s, primarily as a result of reforestation on hillslopes and improved agricultural productivity. Above 3400 m, under climate warming since the 1980s, NDVI did not increase significantly in 1990s and even decreased in 2000s as the consecutive rise of temperature is higher towards higher altitudes in the 2000s. (3) The area-weighted NDVIs illustrated that from 1980s to 2000s, the increased mean NDVI in the whole region arose from contributions of 20.93, 60.66 and 18.41% changes in NDVIs in cultivated land, woodland and grassland, respectively. In 2000s, the proportion of the woody trees contribution to NDVI increased due to reforestation in the low elevation area (<3400 m), but decreased due to shift of the woody trees to alpine grass under the consecutive climate warming in the high elevation area (>3400 m). The decease of NDVI in the high elevations did not alter increasing trend of NDVI across the whole region during 1982–2015. However, in future, the greening could diminish or even cease as climate warming continues and effects of artificially managed ecological restoration reduce.
format	article
author	Shanshan Jiang Xi Chen Keith Smettem Tiejun Wang
author_facet	Shanshan Jiang Xi Chen Keith Smettem Tiejun Wang
author_sort	Shanshan Jiang
title	Climate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest China
title_short	Climate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest China
title_full	Climate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest China
title_fullStr	Climate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest China
title_full_unstemmed	Climate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest China
title_sort	climate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest china
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/337ae0e9bb1a4a8788b396ba8adb8d2b
work_keys_str_mv	AT shanshanjiang climateandlanduseinfluencesonchangingspatiotemporalpatternsofmountainvegetationcoverinsouthwestchina AT xichen climateandlanduseinfluencesonchangingspatiotemporalpatternsofmountainvegetationcoverinsouthwestchina AT keithsmettem climateandlanduseinfluencesonchangingspatiotemporalpatternsofmountainvegetationcoverinsouthwestchina AT tiejunwang climateandlanduseinfluencesonchangingspatiotemporalpatternsofmountainvegetationcoverinsouthwestchina
_version_	1718405834608738304

Climate and land use influences on changing spatiotemporal patterns of mountain vegetation cover in southwest China

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