Forest canopy photosynthesis and vegetation indices
- 著者
- Muraoka H., Noda H. M., Nagai S., Motohka T., Saitoh T. M., Nasahara K. N., Saigusa N.
- 雑誌名
- J. Plant Ecol., 6 (5), 393-407
- DOI
- 10.1093/jpe/rts037
- 概要
-
Our in situ observation of leaf and canopy characteristics, which were analyzed by an ecosystem carbon cycling model, revealed that their phenological changes are responsible for seasonal and interannual variations in canopy photosynthesis. Significant correlations were found between the five VIs and canopy photosynthetic capacity over the seasons and years; four of the VIs showed hysteresis-type relationships and only CCI showed rather linear relationship. Among the VIs examined, we applied EVI–GPPmax relationship to EVI data obtained by Moderate Resolution Imaging Spectroradiometer to estimate the temporal and spatial variation in GPPmax over central Japan. Our findings would improve the accuracy of satellite-based estimate of forest photosynthetic productivity in fine spatial and temporal resolutions, which are necessary for detecting any response of terrestrial ecosystem to meteorological fluctuations.
日本の中部に位置する冷温帯落葉広葉樹林において、5年間の詳細な連続観測データをもとに、群落スケールでの光合成生産量の変動と5種類の分光植生指数の関係を求めた。光合成量と植生指数の関係の季節性を調べたところ、いくつかの指数については春と秋で異なる関係が認められ、光合成の季節変化を適切に推定する上で問題が生じることがわかった。