Fig. 4: Drivers and time lags of vegetation drought response per biome and hydroclimatic regime.
From: Fast response of satellite fluorescence-derived plant physiology to drought stress
We summarize correlations and response times in four background hydrological environments, including (Hyper) Arid (a, e, i, m), Semi-Arid (b, f, j, n), Dry-sub humid (c, g, k, o) and Humid (d, h, l, p). a–h, Correlations. i–p Response times. Results correspond to soil moisture (SM) (a–d, i–l) and vapor pressure deficit (VPD) (e–h, m–p). Values indicate the mode of the kernel density distribution curve for each group. TRO-BF: tropical broadleaf forests, TEM-BF: temperate broadleaf forests, NF: needleleaf forests, MF: mixed forests, SAV: savannas, GRA: grasslands, CRO: croplands. Evergreen broadleaf forests and deciduous broadleaf forests in the MCD12C1 are merged into one category. Then, the broadleaf forests are classified into TRO-BF and TEM-BF according to Köppen-Geiger climate classification78. Evergreen needleleaf forests and deciduous needleleaf forests in the MCD12C1 are also merged, the same as for savannas (i.e., open shrublands, closed shrublands, savannas and woody savannas). Hydroclimatic conditions are based on aridity index, defined as AI = Precipitation/Potential evaporation79: (Hyper) Arid: AI < 0.2; Semi-Arid: AI = 0.2–0.5; Dry sub-humid: AI = 0.5–0.65; Humid: AI > 0.65. The vertex labels of the unlabeled triangles and heptagons are the same as those of the first triangle and the first heptagon, respectively. The source data can be found in Supplementary Data 1.
