Vegetation dynamics and responses to climate change and anthropogenic activities in the Three-River Headwaters Region, China

The Three-River Headwaters Region (TRHR) is an area of crucial significance for the ecological security of China. Owing to dramatic climate change and human activities driven by a series of ecological restoration projects, the ecological environment and vegetation have changed drastically in recent...

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Autores principales:	Xucai Zhang, Xiaomei Jin
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Vegetation dynamics NDVI Climate change Anthropogenic factors Three-River Headwaters Region Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/0ede545b57594ec592b5ad38f870df54
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spelling	oai:doaj.org-article:0ede545b57594ec592b5ad38f870df542021-12-01T05:00:52ZVegetation dynamics and responses to climate change and anthropogenic activities in the Three-River Headwaters Region, China1470-160X10.1016/j.ecolind.2021.108223https://doaj.org/article/0ede545b57594ec592b5ad38f870df542021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21008888https://doaj.org/toc/1470-160XThe Three-River Headwaters Region (TRHR) is an area of crucial significance for the ecological security of China. Owing to dramatic climate change and human activities driven by a series of ecological restoration projects, the ecological environment and vegetation have changed drastically in recent years. However, our knowledge of the current state and driving force of the change in the entire region is limited. This study mapped the spatiotemporal changes in vegetation coverage and quantitatively identified the contributions of climate change and anthropogenic factors to such variations from 2000 to 2018 using 133 MODIS NDVI images at 250 m resolution. The results show that over the past 19 years, the average NDVI demonstrated a fluctuating but upward trend, with a rate of increase of 0.0013 yr−1. Areas with increased vegetation coverage accounted for 54.93% of the entire area, and among them, 18.52% showed a significant greening trend. Based on the Hurst exponent, areas with sustained increasing trends were primarily concentrated in the northeastern, western, and southwestern parts of the Yellow River region, and the western Yangtze River region. The average contributions of the precipitation, temperature, and sunshine duration to NDVI were 0.069, 0.098, and 0.059%·yr−1, respectively. Sunshine duration had the greatest influence on the inter-annual change of NDVI during the entire study period, while the temperature was the main climatic factor from 2000 to 2010. The average contributions of climate change and anthropogenic factors to inter-annual variations of NDVI were 0.226 and –0.096%·yr−1, respectively. The general climate conditions are beneficial to the vegetation recovery, whereas human activities negatively impact the vegetation growth. However, the ecological afforestation projects positively influenced the east Yellow River, Lancang River, and west Yangtze River regions.Xucai ZhangXiaomei JinElsevierarticleVegetation dynamicsNDVIClimate changeAnthropogenic factorsThree-River Headwaters RegionEcologyQH540-549.5ENEcological Indicators, Vol 131, Iss , Pp 108223- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Vegetation dynamics NDVI Climate change Anthropogenic factors Three-River Headwaters Region Ecology QH540-549.5
spellingShingle	Vegetation dynamics NDVI Climate change Anthropogenic factors Three-River Headwaters Region Ecology QH540-549.5 Xucai Zhang Xiaomei Jin Vegetation dynamics and responses to climate change and anthropogenic activities in the Three-River Headwaters Region, China
description	The Three-River Headwaters Region (TRHR) is an area of crucial significance for the ecological security of China. Owing to dramatic climate change and human activities driven by a series of ecological restoration projects, the ecological environment and vegetation have changed drastically in recent years. However, our knowledge of the current state and driving force of the change in the entire region is limited. This study mapped the spatiotemporal changes in vegetation coverage and quantitatively identified the contributions of climate change and anthropogenic factors to such variations from 2000 to 2018 using 133 MODIS NDVI images at 250 m resolution. The results show that over the past 19 years, the average NDVI demonstrated a fluctuating but upward trend, with a rate of increase of 0.0013 yr−1. Areas with increased vegetation coverage accounted for 54.93% of the entire area, and among them, 18.52% showed a significant greening trend. Based on the Hurst exponent, areas with sustained increasing trends were primarily concentrated in the northeastern, western, and southwestern parts of the Yellow River region, and the western Yangtze River region. The average contributions of the precipitation, temperature, and sunshine duration to NDVI were 0.069, 0.098, and 0.059%·yr−1, respectively. Sunshine duration had the greatest influence on the inter-annual change of NDVI during the entire study period, while the temperature was the main climatic factor from 2000 to 2010. The average contributions of climate change and anthropogenic factors to inter-annual variations of NDVI were 0.226 and –0.096%·yr−1, respectively. The general climate conditions are beneficial to the vegetation recovery, whereas human activities negatively impact the vegetation growth. However, the ecological afforestation projects positively influenced the east Yellow River, Lancang River, and west Yangtze River regions.
format	article
author	Xucai Zhang Xiaomei Jin
author_facet	Xucai Zhang Xiaomei Jin
author_sort	Xucai Zhang
title	Vegetation dynamics and responses to climate change and anthropogenic activities in the Three-River Headwaters Region, China
title_short	Vegetation dynamics and responses to climate change and anthropogenic activities in the Three-River Headwaters Region, China
title_full	Vegetation dynamics and responses to climate change and anthropogenic activities in the Three-River Headwaters Region, China
title_fullStr	Vegetation dynamics and responses to climate change and anthropogenic activities in the Three-River Headwaters Region, China
title_full_unstemmed	Vegetation dynamics and responses to climate change and anthropogenic activities in the Three-River Headwaters Region, China
title_sort	vegetation dynamics and responses to climate change and anthropogenic activities in the three-river headwaters region, china
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/0ede545b57594ec592b5ad38f870df54
work_keys_str_mv	AT xucaizhang vegetationdynamicsandresponsestoclimatechangeandanthropogenicactivitiesinthethreeriverheadwatersregionchina AT xiaomeijin vegetationdynamicsandresponsestoclimatechangeandanthropogenicactivitiesinthethreeriverheadwatersregionchina
_version_	1718405583485272064

Vegetation dynamics and responses to climate change and anthropogenic activities in the Three-River Headwaters Region, China

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