Quantifying the drought sensitivity of vegetation types in northern China from 1982 to 2022,Agricultural and Forest Meteorology

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Quantifying the drought sensitivity of vegetation types in northern China from 1982 to 2022
Agricultural and Forest Meteorology ( IF 5.6 ) Pub Date : 2024-11-01 , DOI: 10.1016/j.agrformet.2024.110293
Bo Yuan, Shanchuan Guo, Xingang Zhang, Haowei Mu, Shengpeng Cao, Zilong Xia, Xiaoquan Pan, Peijun Du

Quantifying vegetation responses to drought and assessing their vulnerability are crucial for mitigating the adverse impacts of extreme drought events. In northern China, vegetation responses to the accumulative and lagged effects of drought remain unclear, and the drought sensitivity of different vegetation types has not been well understood. Here, the accumulative effect refers to the cumulative impact of antecedent climatic factors over time on current vegetation status, while the lagged effect represents the delayed impact of specific past climatic conditions on current vegetation. In this study, vegetation responses to meteorological drought were investigated during 1982–2022 using the Spearman rank correlation analysis, based on the Normalized Difference Vegetation Index (NDVI) and the Standardized Precipitation Evapotranspiration Index (SPEI). The accumulative and lagged effects of drought on different vegetation types (i.e., grass, forest, cropland, and desert), as well as their drought sensitivity, were analyzed across four bioclimatic zones. The results reveal that vegetation types are more influenced by the accumulative effect rather than the lagged effect in northern China. Specifically, 62.1 % and 17.5 % of the vegetated land is positively influenced by the accumulative and lagged effects (p < 0.05), respectively. The average accumulated time shows an increasing trend in arid, semi-arid, sub-humid, and humid regions (i.e., 12.7, 13.6, 17.5, and 19.0 months, respectively), as well as the average lagged time (i.e., 13.1, 14.2, 11.8, and 14.2 months, respectively). In addition, the results suggest that vegetation responses to drought are highly sensitive not only in dry regions but also in certain wet areas of northern China, particularly in forest within wet environments. These findings will support assessments of ecologically fragile areas and the development of region-specific adaptation measures for drought on vegetation ecosystems in northern China.

更新日期：2024-11-01

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