The estimation of post-fire vegetation recovery is essential for forest management and wildfire policy-making. In the last few decades, vegetation indices have been widely used to monitor post-fire vegetation recovery by comparison with the pre-fire state. In this study, vegetation recovery is estimated using Solar-Induced chlorophyll Fluorescence (SIF), which is a by-product of photosynthesis and can reflect the physiological characteristics of a plant. We found that 20 years is insufficient for vegetation recovery, as the SIF within burned areas exhibited a significant increasing trend, which was most notable within the first 6 to 10 years after a wildfire. When comparing the SIF within and outside burned areas, we found that, during the first 3 to 6 years, SIF values outside burned areas were larger than that within burned areas; however, after ~6 years, the SIF within the burned areas exceeded that outside burned areas owing to the different carbon sequestration intensities of different vegetation recovery stages. Field photos of recovering vegetation were then compared with the Enhanced Vegetation Index (EVI) trend within the burned area, and it was found that, although the EVI reached pre-fire levels or stabilised, vegetation recovery was continuing.

火灾后植被恢复的估算对于森林管理和野火决策至关重要。在过去的几十年中，与火灾前的状态相比，植被指数已广泛用于监测火灾后的植被恢复。在这项研究中，使用太阳诱导的叶绿素荧光（SIF）估算植被恢复，SIF是光合作用的副产物，可以反映植物的生理特征。我们发现20年不足以恢复植被，因为烧毁地区的SIF呈显着增加趋势，这在野火发生后的最初6至10年内最为明显。在比较燃烧区域内外的SIF时，我们发现，在最初的3至6年中，燃烧区域外的SIF值大于燃烧区域内的SIF值。然而，约6年后，由于不同植被恢复阶段的固碳强度不同，燃烧区内的SIF值超过燃烧区内的SIF。然后将恢复植被的野外照片与燃烧区域内的增强植被指数（EVI）趋势进行了比较，结果发现，尽管EVI达到了火灾前的水平或稳定了，但植被恢复仍在继续。