The ratio of transmitted near-infrared radiation to photosynthetically active radiation (PAR) increases in proportion to the adsorbed PAR in the canopy

Journal of Plant Research - Tập 124 - Trang 99-106 - 2010
Atsushi Kume1, Kenlo N. Nasahara2, Shin Nagai3, Hiroyuki Muraoka4
1Ashoro Research Forest, Department of Forest and Forest Products Sciences, Faculty of Agriculture, Kyushu University, Ashoro, Japan
2Graduate School of Life and Environmental Science, University of Tsukuba, Tsukuba, Japan
3Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
4Institute for Basin Ecosystem Studies, Gifu University, Gifu, Japan

Tóm tắt

The daily total photosynthetically active radiation (400–700 nm, PAR) and near-infrared radiation (700–1000 nm, NIR) were measured in the understory beneath the canopy (PARt and NIRt) and above the canopy (PARi and NIRi) of a Japanese cool-temperate deciduous broad-leaved forest during the snow-free period (May to November). The integration of spectral radiation for NIR and that for PAR, and the daily integrations of instantaneous NIR and PAR, reduced the noises from the optical difference in spectrum and from canopy structure heterogeneity, sky condition and solar elevation. PARi/PARt was linearly related to NIRt/PARt (R² = 0.96). The effect of cloudiness was negligible, because the fluctuation of NIRi/PARi was quite small regardless of season and weather conditions compared with the range of NIRt/PARt in the forest. The ratio of NIRt/PARt beneath the canopy was log-linearly related to the in situ leaf area index (LAI) with a wide range from 0 to 5.25 (R² = 0.97). We conclude that seasonal changes in fAPAR (= 1 − PARt/PARi) and LAI of a canopy can be estimated with high accuracy by transmitted NIRt and PARt beneath the canopy.

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