干旱区生态环境知识资源中心(Arid): Inter-annual drought monitoring in northern mixed grasslands by a revised vegetation health index from historical Landsat imagery

Arid

DOI	10.1016/j.jaridenv.2023.104964
	Inter-annual drought monitoring in northern mixed grasslands by a revised vegetation health index from historical Landsat imagery
	Yu, Xiaolei; Guo, Xulin
通讯作者	Yu, XL
来源期刊	JOURNAL OF ARID ENVIRONMENTS
ISSN	0140-1963
EISSN	1095-922X
出版年	2023
卷号	213
英文摘要	Drought is defined as a natural phenomenon with comprehensive influences on ecosystems, economies, and the livelihood and health of people resident in the affected regions. Severe drought has affected the grassland ecosystem in the Canadian prairie region with increased frequency. Thus, it is essential to monitor the drought effects. With various temporal, spectral, and spatial resolutions, remote sensing data can detect vegetation's dynamic responses to drought. The objective of this study was to monitor inter-annual drought in the northern mixed grassland, over the last thirty-six years by using remote sensing approach through a revised vegetation health index (VHIr), which combined the vegetation condition index (VCI), the temperature condition index (TCI), and the dead fuel condition index (DCI) together. Historical Landsat imagery was explored to establish the VHIr and this index was tested in the Grasslands National Parks (GNP), a typical conserved northern mixed grasslands region. The results suggested that the VHIr can distinguish dry and wet years effectively and a VHIr map was able to depict the spatial distribution pattern of the drought severity. Compared with the original vegetation health index (VHI), VHIr was more correlated with the dead-to-green biomass ratio. Meanwhile, the spatial pattern indicated that the valley grasslands had relatively low drought sensitivity; the upland grasslands experienced severe to extreme drought severity during dry years, due to a large amount of dead vegetation existed; and the drought effect on sloped grasslands was due to relatively sparse vegetation cover. In addition, VHIr was significantly correlated with greenness and wetness components derived from the tasseled cap (K-T) transformation but the correlation coefficients (r) varied between dry and wet years and among different grassland landscapes. This study expanded our understanding of the spatial and temporal distribution of drought severity in the northern mixed grasslands, which can facilitate natural resource management in the arid and semi-arid regions.
英文关键词	Drought severity Landsat Grasslands National Park Vegetation health index Dead fuel index Land surface temperature Northern mixed grasslands
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000956436900001
WOS关键词	EVAPOTRANSPIRATION ; TRANSFORMATION ; IMPACTS ; WATER ; PRECIPITATION ; DERIVATION
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/2XILL650/397146
推荐引用方式 GB/T 7714	Yu, Xiaolei,Guo, Xulin. Inter-annual drought monitoring in northern mixed grasslands by a revised vegetation health index from historical Landsat imagery[J],2023,213.
APA	Yu, Xiaolei,&Guo, Xulin.(2023).Inter-annual drought monitoring in northern mixed grasslands by a revised vegetation health index from historical Landsat imagery.JOURNAL OF ARID ENVIRONMENTS,213.
MLA	Yu, Xiaolei,et al."Inter-annual drought monitoring in northern mixed grasslands by a revised vegetation health index from historical Landsat imagery".JOURNAL OF ARID ENVIRONMENTS 213(2023).