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首页> 外文会议>International Congress on Image and Signal Processing, BioMedical Engineering and Informatics >Deciduous broadleaf forests green FPAR and its relationship with spectral vegetation indices
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Deciduous broadleaf forests green FPAR and its relationship with spectral vegetation indices

机译：落叶阔叶林绿色FPAR及其与光谱植被指数的关系

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The fraction of absorbed photosynthetically active radiation (FPAR) is directly related to the primary productivity of photosynthesis, and is widely used to estimate ecosystem primary production. The forest canopy can be divided into photosynthetically active vegetation and non-photosynthetic vegetation according to their photosynthetical function. In this study, the scattering by arbitrary inclined leaves (SAIL) model was used to partition the PAR absorbed by canopy components into two parts: PAR absorbed by PAV and PAR by NPV. The characteristics of green FPAR (the fraction of PAR absorbed by PAV) and the relationships between green FPAR and spectral vegetation indices (NDVI, EVI, EVI2, SAVI) were analyzed. The results showed that the green FPAR varied with the canopy structure. In broadleaf deciduous forests with high coverage, the green FPAR was close to the total FPAR, and the contribution of NPV to the total FPAR was very low. Plant area index had more important impacts on the green FPAR than the proportion of PAV in the canopy and optical properties of PAV. The green FPAR had significant relationships with four spectral vegetation indices, but the correlation coefficient between green FPAR and EVI was the largest. Therefore, compared with other three vegetation indices, EVI may be more suitable to estimate forest green FPAR.
机译：吸收的光合作用活性辐射（FPAR）的比例与光合作用的初级生产力直接相关，被广泛用于估算生态系统的初级生产力。根据林冠的光合功能，可以将其分为光合活性植被和非光合植被。在这项研究中，使用任意倾斜叶散射（SAIL）模型将冠层成分吸收的PAR分为两部分：PAV吸收的PAR和NPV吸收的PAR。分析了绿色FPAR的特性（PAV吸收的PAR的比例）以及绿色FPAR与光谱植被指数（NDVI，EVI，EVI2，SAVI）之间的关系。结果表明，绿色FPAR随冠层结构的变化而变化。在高覆盖率的阔叶落叶林中，绿色FPAR接近总FPAR，NPV对总FPAR的贡献非常低。种植面积指数对绿色FPAR的影响比PAV在冠层中的比例和PAV的光学特性更重要。绿色FPAR与四个光谱植被指数有显着关系，但绿色FPAR与EVI之间的相关系数最大。因此，与其他三个植被指数相比，EVI可能更适合估算森林绿色FPAR。

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