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@ARTICLE{2026JHyd..66935086X,
       author = {{Xing}, Yuanxiao and {Wang}, Shunsheng and {Wang}, Aili and {Wang}, Donglin},
        title = "{Spatiotemporal dynamics of meteorological and groundwater droughts in Southwest China and their cumulative and lagged impacts on vegetation}",
      journal = {Journal of Hydrology},
     keywords = {Drought, GRACE, NDVI, Cumulative effect, Lag effect, Karst region},
         year = 2026,
        month = apr,
       volume = {669},
          eid = {135086},
        pages = {135086},
     abstract = "{Drought is one of the most severe natural challenges in Southwest China,
        where complex karst hydrogeological conditions exacerbate its
        impacts on vegetation ecosystems. However, the mechanisms by
        which different drought types affect vegetation in this region
        remain unclear. This study integrated multiple datasets (GRACE,
        GLDAS, SPEI, and MODIS NDVI) to investigate the spatiotemporal
        evolution of meteorological drought, groundwater drought, and
        vegetation conditions across Southwest China from 2004 to 2023.
        Pearson correlation analysis was applied to quantify the
        cumulative and lag effects of the two drought types on
        vegetation in karst and non-karst areas. The results revealed
        that: (1) GRACE- and GLDAS-derived terrestrial water storage
        anomalies exhibited consistent patterns in Southwest China (r =
        0.86, P < 0.001); (2) both drought types showed a slight overall
        alleviation, yet drought intensification remained pronounced in
        the western high-altitude areas; (3) compared with cumulative
        effects, the lag effects of drought appeared to be relatively
        more pronounced; and (4) vegetation in karst regions responded
        more rapidly to groundwater drought, while shallow-rooted
        grasslands were more sensitive to the cumulative effects of
        meteorological drought, with a typical response time of
        approximately one month. These findings provide valuable
        insights for drought monitoring and ecological conservation in
        ecologically fragile regions and offer new scientific evidence
        for understanding drought─vegetation interactions in both karst
        and non-karst landscapes.}",
          doi = {10.1016/j.jhydrol.2026.135086},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2026JHyd..66935086X},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}