Spatiotemporal variations of drought and driving factors based on multiple remote sensing drought indices: A case study in karst areas of southwest China

Droughts are recurrent in southwest China due to the fragility and sensitivity of the karst environment. These events have serious impacts on local agricultural output, ecological diversity, and social stability. Understanding spatiotemporal variations and driving factors of drought in this area is...

Full description

Saved in:
Bibliographic Details
Published in:Journal of mountain science 2023-11, Vol.20 (11), p.3215-3232
Main Authors: Lu, Xian-jian, Li, Zhen-bao, Yan, Hong-bo, Liang, Yue-ji
Format: Article
Language:English
Subjects:
Agricultural production
Biodiversity
Coefficients
Correlation coefficient
Correlation coefficients
Desertification
Drought
Drought index
Earth and Environmental Science
Earth Sciences
Ecology
Environment
Fragility
Geography
Geologic depressions
Karst
Mathematical analysis
Mitigation
Original Article
Remote sensing
Vegetation
Water supply
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Droughts are recurrent in southwest China due to the fragility and sensitivity of the karst environment. These events have serious impacts on local agricultural output, ecological diversity, and social stability. Understanding spatiotemporal variations and driving factors of drought in this area is of extreme importance for effective mitigation measures. The karst areas situated in southwest China were spatially divided into seven sub-regions according to the topography and degree of karst development. Drought indices, including vegetation condition index (VCI), temperature condition index (TCI), vegetation health index (VHI), normalized vegetation water supply index (NVSWI), and temperature vegetation drought index (TVDI), were calculated from MODIS data during 2000 and 2018 for each sub-region, and drought patterns were examined. The results show that droughts were found to be concentrated in sub-regions such as karst basin, karst plateau, karst gorge, and karst depression areas. Furthermore, there were more drought conditions in karst areas than in non-karst areas. In addition, improvements to drought situation in the study period are significant ( p
ISSN:1672-6316
1993-0321
1008-2786
DOI:10.1007/s11629-023-7927-7