Post-fire stand water balance is a critical factor influencing tree regeneration and survival, which are often modulated by fire severity. We examined influences of the post-fire vegetation matrix and fire severity on diurnal, seasonal, and multi-year variation in evapotranspiration (ET) by analyzing the relationship between post-fire vegetation and ECOsystem Spaceborne Thermal Radiometer Experiment on the International Space Station (ECOSTRESS) ET data using multivariate and linear mixed effects modeling. Unlike many high-severity fire sites where ET drops after burning, post-fire ET was high at shrubland sites that burned at high fire severity in southern Arizona, USA. In this study, post-fire ET was driven by plant species composition and tree canopy cover. ET was significantly higher in the morning and midday in densely vegetated post-fire shrublands than pine-dominated forests that remained 5–7 years after wildfire. Our results demonstrate that plant functional traits such as resprouting and desiccation tolerance drive post-fire ET patterns, and they are likely to continue to play critical roles in shaping post-fire plant communities and forest water cycling under future environmental change.

中文翻译：

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野火严重程度和植被恢复驱动美国亚利桑那州西南部松橡树林的火灾后蒸散

火灾后的水平衡是影响树木再生和生存的关键因素，通常受火灾严重程度的影响。我们通过分析火灾后植被与国际空间站生态系统星载热辐射计实验 (ECOSTRESS) 之间的关系，研究了火灾后植被矩阵和火灾严重程度对蒸散量 (ET) 的日变化、季节变化和多年变化的影响。 ) ET 数据使用多元和线性混合效应建模。与许多燃烧后 ET 下降的高强度火灾地点不同，在美国亚利桑那州南部以高火灾严重程度燃烧的灌木丛地点，火灾后 ET 很高。在这项研究中，火灾后 ET 是由植物物种组成和树冠覆盖率驱动的。火灾后植被茂密的灌木丛中，早上和中午的 ET 显着高于野火后 5-7 年仍以松树为主的森林。我们的研究结果表明，植物功能性状，如再发芽和耐干燥性驱动火灾后 ET 模式，并且在未来环境变化下，它们可能继续在塑造火灾后植物群落和森林水循环方面发挥关键作用。