@article{oai:nipr.repo.nii.ac.jp:00010130,
 author = {Iwata, Hiroki and Ueyama, Masahito and Iwama, Chie and Harazono, Yoshinobu and Iwata, Hiroki and Ueyama, Masahito and Iwama, Chie and Harazono, Yoshinobu},
 issue = {2},
 journal = {Polar science, Polar science},
 month = {Jun},
 note = {Absorption of photosynthetically active radiation (PAR) by vegetation was observed in two burned black spruce forests, one and seven years after wildfire, in interior Alaska along with several vegetation properties. This study considered PAR absorption by mosses by examining the relationship between PAR transmittance and fractional coverage of green vegetation. Our results suggest that mosses absorbed a considerable fraction of incoming PAR in the burned forests, which cannot be neglected in evaluating the fraction of absorbed PAR (FPAR). The relationships between FPAR and vegetation indices revealed that enhanced vegetation index (EVI) may be suitable for expressing the spatial and temporal variation of FPAR, regardless of stand age after wildfire. The comparison between the observed in situ FPAR and FPAR derived from Moderate Resolution Imaging Spectroradiometer (MODIS FPAR) clearly showed that MODIS FPAR was highly overestimated. The most likely reason for the overestimation was identified as misclassification of land cover type. The current regional estimation of photosynthesis in boreal region based on the light-use efficiency approach and MODIS FPAR is probably overestimated, and an accurate distribution of FPAR is desired for clarifying the regional carbon exchange in boreal forests., アラスカ内陸部のクロトウヒ林火災跡（火災後1年と7年）において，植生による光合成有効放射量（PAR）の吸収の測定を行った．PARの吸収割合（FPAR）を調べる上でモスによる吸収の寄与を含むことが重要であることがわかった．FPARと植生指数の関係から，EVIと呼ばれる植生指数がFPARの時空間変化を表すのに適している可能性が示された．測定したFPARと中分解能撮像分光放射計（MODIS）データから得られたFPARを比較した結果，MODISのFPARは大きく過大評価になっていることがわかった．この過大評価の原因は地表面被覆のエラーであると考えられる．北方林地域の炭素交換を明らかにするためには正確なFPARの分布を知ることが重要である．},
 pages = {113--124},
 title = {Variations in fraction of absorbed photosynthetically active radiation and comparisons with MODIS data in burned black spruce forests of interior Alaska},
 volume = {7},
 year = {2013}
}