干旱区生态环境知识资源中心(Arid): Spatial and Temporal Change Characteristics and Climatic Drivers of Vegetation Productivity and Greenness during the 2001-2020 Growing Seasons on the Qinghai-Tibet Plateau

Arid

DOI	10.3390/land13081230
	Spatial and Temporal Change Characteristics and Climatic Drivers of Vegetation Productivity and Greenness during the 2001-2020 Growing Seasons on the Qinghai-Tibet Plateau
	Liang, Jinghan; Marino, Armando; Ji, Yongjie
通讯作者	Ji, YJ
来源期刊	LAND
EISSN	2073-445X
出版年	2024
卷号	13 期号:8
英文摘要	Exploring NDVI variation and what drives it on the Qinghai-Tibet Plateau can strategically inform environmental protection efforts in light of global climate change. For this analysis, we obtained MODIS NDVI data collected during the vegetative growing season, vegetation types for the region, and meteorological data for the same period from 2001 to 2020. We performed Theil-Sen trend analysis, Mann-Kendall significance testing, spatial autocorrelation analysis, and Hurst index calculation to review the spatiotemporal changes in NDVI characteristics on the plateau for various vegetation types. We used the correlation coefficients from these analyses to investigate how the NDVI responds to temperature and precipitation. We found the following: (1) Overall, the Qinghai-Tibet Plateau NDVI increased throughout the multi-year growing season, with a much larger area of improvement (65.68%) than of degradation (8.83%). (2) The four main vegetation types were all characterized by improvement, with meadows (72.13%) comprising the largest portion of the improved area and shrubs (18.17%) comprising the largest portion of the degraded area. (3) The spatial distribution of the NDVI had a strong positive correlation and clustering effect and was stable overall. The local clustering patterns were primarily low-low and high-high clustering. (4) The Hurst index had an average value of 0.46, indicating that the sustainability of vegetation is poor; that is, the trend of vegetation change in the growing season in a large part of the Qinghai-Tibet Plateau in the future is opposite to that in the past. (5) The plateau NDVI correlated positively with air temperature and precipitation. However, the correlations varied geographically: air temperature had a wide influence, whereas precipitation mainly influenced meadows and grassland in the northern arid zone. The overall temperature-driven effect was stronger than that of precipitation. This finding is consistent with the current research conclusion that global warming and humidification promote vegetation growth in high-altitude areas and further emphasizes the uniqueness of the Qinghai-Tibet Plateau as a climate-change-sensitive area. This study also offers a technical foundation for understanding how climate change impacts high-altitude ecosystems, as well as for formulating ecological protection strategies for the plateau.
英文关键词	Qinghai-Tibet Plateau NDVI different vegetation types meteorological factors correlation
类型	Article
语种	英语
开放获取类型	gold
收录类别	SSCI
WOS记录号	WOS:001305209100001
WOS关键词	TREND ; CHINA
WOS类目	Environmental Studies
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/2XILL650/404829
推荐引用方式 GB/T 7714	Liang, Jinghan,Marino, Armando,Ji, Yongjie. Spatial and Temporal Change Characteristics and Climatic Drivers of Vegetation Productivity and Greenness during the 2001-2020 Growing Seasons on the Qinghai-Tibet Plateau[J],2024,13(8).
APA	Liang, Jinghan,Marino, Armando,&Ji, Yongjie.(2024).Spatial and Temporal Change Characteristics and Climatic Drivers of Vegetation Productivity and Greenness during the 2001-2020 Growing Seasons on the Qinghai-Tibet Plateau.LAND,13(8).
MLA	Liang, Jinghan,et al."Spatial and Temporal Change Characteristics and Climatic Drivers of Vegetation Productivity and Greenness during the 2001-2020 Growing Seasons on the Qinghai-Tibet Plateau".LAND 13.8(2024).