Precipitation mediates sap flux sensitivity to evaporate demand in the neotropics, Oecologia: Dataset

Using measurements in 34 tree species at seven sites across a precipitation gradient in the neotropics, we determined how the maximum sap flux velocity (vmax) and the VPD threshold at which vmax is reached (VPDmax) vary with precipitation regime (long-term annual precipitation, MAP; seasonal drought intensity, PDRY) and two functional traits related to foliar and wood economics spectra (leaf mass per area, LMA; wood specific gravity, WSG). This study demonstrates that long-term precipitation plays an important role in the sapflux response of humid tropical forests to VPD.

我们利用新热带地区降水梯度上7个站点34个树种的测量数据，分析了最大树液通量速率（vmax）、达到vmax时的水汽压亏缺（VPD）阈值（VPDmax）如何随降水格局（长期年降水量MAP、季节性干旱强度PDRY）以及与叶和木材经济谱（foliar and wood economics spectra）相关的两个功能性状（比叶质量LMA、木材比重WSG）变化。本研究表明，长期降水在湿润热带森林对VPD的树液通量响应中发挥着重要作用。