Seasonal Variation in Fraction of Absorbed PhotosyntheticallyActic Radiation and Vegetation Properties in Burned Forests in Interior Alaska

Fraction of absorbed photosynthetically acrive radiation (FAPAR) is an important ecophysiological parameter for carbon and water exchange modeling. However, validation studies of FAPAR are scarce, especially for disturbance area. One study (Steinberg et al., 2006) revealed that the MODIS FAPAR product is overestimated for burned boreal forests. Wildfire is a major disturbance in boreal forest ecosystems, and it significantly influences carbon and water exchange processes. It is important to explicitly incorporate burned areas in estimating regional exchanges.

吸收性光合有效辐射分量（Fraction of Absorbed Photosynthetically Active Radiation，FAPAR）是支撑碳循环与水汽交换模拟的关键生态生理参数。然而，针对FAPAR的验证研究相对匮乏，针对受干扰区域的相关研究尤为稀缺。Steinberg等人于2006年开展的一项研究显示，MODIS FAPAR产品对过火寒带森林的反演结果存在高估现象。野火是寒带森林生态系统中的主要干扰因子，会显著影响碳循环与水汽交换过程。在估算区域碳、水交换量时，明确纳入过火区域信息具有重要意义。