Abstract
The increasing frequency of recent droughts has an adverse effect on the ecosystem of the Mongolian Plateau. The growth condition of NPP is considered an indicator of the ecological function. Therefore, identifying the relationship between NPP and drought can assist in the prevention of drought-associated disasters and the conservation of the ecological environment of the Mongolian Plateau. This study used the Carnegie-Ames-Stanford Approach (CASA) model to simulate the NPP capacity of the Mongolian Plateau between 1982 and 2015, as well as drought indicators (drought probability, vulnerability, and risk) to explore the drought risk of NPP. The findings pointed to an overall increase in NPP with regional variances; however, the NPP rate in Inner Mongolia was considerably higher than that in Mongolia. The standardized precipitation evapotranspiration index (SPEI) showed an overall downward trend, with Inner Mongolia experiencing a substantially lower rate of decline than Mongolia. The areas most likely to experience drought were primarily in the center and north while the areas with the highest drought vulnerability were primarily in the northeast, center, and southeast. Mongolia showed a higher probability of drought compared to Inner Mongolia. Drought-prone regions of the Mongolian Plateau increased during the 21st century while drought-vulnerable areas increased and shifted from north to south. Alpine grasslands and coniferous forests were least vulnerable to drought, while other vegetation types experienced temporal variation. In the 21st century, the primary determinants of drought risk shifted from precipitation and the normalized difference vegetation index (NDVI) to temperature and relative humidity.
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Foundation: Natural Science Foundation of Inner Mongolia, No.2023MS04001; National Natural Science Foundation of China, No.42061070, No.42261144746; Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region, No.NJYT23018; Innovative Project of Young “Grasslands Talents”; Fundamental Research Funds for the Inner Mongolia Normal University, No.2022JBBJ013; No.2022JBTD011
Author: Ren Jinyuan (1995–), PhD Candidate
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Ren, J., Guo, X., Tong, S. et al. Risk posed to vegetation net primary productivity by drought on the Mongolian Plateau. J. Geogr. Sci. 33, 2175–2192 (2023). https://doi.org/10.1007/s11442-023-2171-1
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DOI: https://doi.org/10.1007/s11442-023-2171-1