永井 信

査読付き論文

• 28. Nagai S., Saitoh T.M., Noh N.J., Yoon T.K., Kobayashi H., Suzuki R., Nasahara K.N., Yowhan Son Y., Muraoka H. Utility of information in photographs taken upwards from the floor of closed-canopy deciduous broadleaved and closed-canopy evergreen coniferous forests for continuous observation of canopy phenology. Ecological Informatics. accepted.

• 27. Nakai T., Kim Y., Busey R.C., Suzuki R., Nagai S., Kobayashi H., Park H., Sugiura K., Ito A. Characteristics of evapotranspiration from a permafrost black spruce forest in interior Alaska. Polar Science accepted.

• 26. Sugiura K., Nagai S., Nakai T., Suzuki R. Applicability of time-lapse digital cameras for ground-truth measurements of satellite indices in the boreal forests of Alaska. Polar Science accepted.
• 25. Nagai S., Nakai T., Saitoh T.M., Busey R.C., Kobayashi H., Suzuki R., Muraoka H., Kim Y. 2012. Seasonal changes in camera-based indices from an open canopy black spruce forest in Alaska, and comparison with indices from a closed canopy evergreen coniferous forest in Japan.Polar Science http://dx.doi.org/10.1016/j.polar.2012.12.001.
• 24. Thanyapraneedkul J., Muramatsu K., Daigo M., Furumi S., Soyama N., Nasahara K.N., Muraoka H., Noda H.M., Nagai S., Maeda T., Mano M., Mizoguchi Y. 2012.
  A Vegetation Index to Estimate Terrestrial Gross Primary Production Capacity for the Global Change Observation Mission-Climate (GCOM-C)/Second-Generation Global Imager (SGLI) Satellite Sensor. Remote Sensing 4: 3689-3712

• 23. Muraoka H., Noda H.M., Nagai S., Motohka T., Saitoh T.M., Nasahara K.N., Saigusa N. 2012. Spectral vegetation indices as the indicator of canopy photosynthetic productivity in a deciduous broadleaf forest. Journal of Plant Ecology doi: 10.1093/jpe/rts037.

• 22. Potithep S., Nagai S., Nasahara K.N., Muraoka H., Suzuki R. 2013. Two separate periods of the LAI-VIs relationships using in situ measurements in a deciduous broadleaf forest. Agricultural and Forest Meteorology. 169:148-155
• 21. Saitoh T.M., Nagai S, Saigusa N, Kobayashi H., Suzuki R., Nasahara K.N., Muraoka H. 2012. Assessing the use of camera-based indices for characterizing canopy phenology in relation to gross primary production in a deciduous broad-leaved and an evergreen coniferous forest in Japan. Ecological Informatics 11:45-54
• 20. Saitoh T.M., Nagai S., Noda H.M., Muraoka H. and Nasahara K.N. 2012. Examination of the extinction coefficient in the Beer-Lambert law for an accurate estimation of the forest canopy leaf area index. Forest Science and Technology8(2):67-76
• 19. Saitoh, T.M., Nagai, S., Yoshino, J., Muraoka, H., Saigusa, N., Tamagawa, I. Functional consequences of differences in canopy phenology for the carbon budgets of two cool-temperate forest types: simulations using the NCAR/LSM model and validation using tower flux and biometric data. Eurasian Journal of Forest Research 15-1:19-30
• 18. Inoue, T., Nagai, S., Inoue, S., Ozaki, M., Sakai, S., Muraoka, H., Koizumi, H. 2012. Seasonal variability of soil respiration in multiple ecosystems under the same physical-geographical environmental conditions in central Japan. Forest Science and Technology 8(2):52-60
• 17. Nagai, S., Saitoh, T.M., Kobayashi, H., Ishihara, M., Motohka, T., Suzuki, R., Nasahara, K.N., Muraoka, H. 2012. In situ examination for the relationship between various vegetation indices and tree phenology in an evergreen coniferous forest, Japan. International Journal of Remote Sensing 33(19):6202-6214
• 16. Nagai, S., Saitoh, T.M., Suzuki, R., Nasahara, K.N., Lee, W.-K., Son, T., Muraoka, H. 2011. The necessity and availability of noise-free daily satellite-observed NDVI during rapid phenological changes in terrestrial ecosystems in East Asia. Forest Science and Technology 7(4):174-183
• 15. Motohka, T., Nasahara, K.N., Murakami, K., Nagai, S. 2011. Evaluation of cloud noises on MODIS daily spectral indices based on in situ measurements. Remote Sensing 2:2369-2387
• 14. Nagai, S., Maeda, T., Gamo, M., Muraoka, H., Suzuki, R., Nasahara, K.N. 2011. Using digital camera images to detect canopy condition of deciduous broad-leaved trees. Plant Ecology and Diversity 4:78-88
• 13. Sugiura, K. et al. (8th author) 2011. Supersite as a common platform for multi-observations in Alaska for a collaborative framework between JAMSTEC and IARC. Jamstec Report of Research and Development 12:61-69
• 12. Kume, A., Nasahara, K.N., Nagai, S., Muraoka, H. 2011. 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 124(1):99-106
• 11. 村上和隆・奈佐原顕郎・秋津朋子・本岡毅・永井信 2011. 衛星センサの分光仕様が草原の植生指数観測に与える影響. 筑波大学陸域環境研究センター報告. 12:13-19
• 10. 秋津朋子・奈佐原顕郎・野田響・本岡毅・村上和隆・土田聡・永井信 2011. 草原の季節変動と年々変動に関するデジタルカメラを用いた長期連続自動観測. 筑波大学陸域環境研究センター報告. 12:5-12
• 9. Muraoka, H., Saigusa, N., Nasahara, K.N., Noda, H., Yoshino, J., Saitoh, T.M., Nagai, S., Murayama, S., Koizumi, H. 2010. Effects of seasonal and interannual variations in leaf photosynthesis and canopy leaf area index on gross primary production of a cool-temperate deciduous broadleaf forest in Takayama, Japan, Journal of Plant Research 123(4):563-576
• 8. Nagai, S., Nasahara, K.N., Muraoka, H., Akiyama, T., Tsuchida, S. 2010. Field experiments to test the use of the normalized difference vegetation index for phenology detection. Agricultural and Forest Meteorology 150:152-160
• 7. Nagai, S., Saigusa, N., Muraoka, H., Nasahara, K.N. 2010. What makes the satellite-based EVI-GPP relationship unclear in a deciduous broad-leaved forest? Ecological Research 25:359-365
• 6. Nasahara, K.N., Muraoka, H., Nagai, S., Mikami, H. 2008. Vertical integration of leaf area index in a Japanese deciduous broad-leaved forest. Agricultural and Forest Meteorology 148:1136-1146
• 5. 永井信・奈佐原（西田）顕郎・石原光則・村岡裕由 2008. 衛星観測で得られた植生指数に対する生理生態学的な考察. システム農学 24(3):183-190
• 4. 玉川一郎・吉野純・加野利生・安田孝志・村岡裕由・児島利治・石原光則・永井信・斎藤琢・李美善・牧雅康・秋山侃・小泉博 2008. 生態プロセスとリモートセンシングを結ぶモデルの開発. システム農学 24(2):129-136
• 3. 吉野純・村岡裕由・永井信・石原光則・斎藤琢・児島利治・玉川一郎・安田孝志 2008. 流域圏を支える森林環境保全のための森林健康診断手法. 環境システム講演論文集 36:277-286
• 2. Nagai, S., Ichii, K., Morimoto, H. 2007. Interannual variations in vegetation activities and climate variability caused by ENSO in tropical rainforests. International Journal of Remote Sensing 28(6):1285–1297
• 1. Nagai, S., Ichii, K., Morimoto, H. 2005. Relationship between interannual variations in satellite-based vegetation index and ENSO phase over tropical forests. Journal of Agricultural Meteorology 60(6):1211-1214

著書

• 5. 岩​波​生​物​学​辞​典​第​5​版​（​分​担​執​筆​）. 2013.
• 4. 村岡裕由,野田響,斎藤琢,永井信,奈佐原顕郎. 2012. 森林生態系の光合成:生理生態学と衛星観測の融合による長期・広域評価. 植物科学の最前線（BSJ-Review）3:30-45 (http://bsj.or.jp/saizensen/).
• 3. Nagai, S. 2012. Phenological observations by using daily satellite-observed vegetation index, in Pastoralism and ecosystem network in Mongolia (eds. Batjargal, Z., Fujita, N., Yamamura, N.), Admon Mongolia, 576p (in Mongolia).
• 2. Muraoka, H., Ishii, R., Nagai, S. et al. 2012. Linking remote sensing and in situ ecosystem / biodiversity observations by "Satellite Ecology", in Biodiversity Observation Network in Asia-Pacific Region (Ecological Research Monographs) (eds. Nakano, S., Nakashizuka, T., and Yahara, T.), Springer Verlag Japan, 277-308
• 1. Maeda, T., Gamo, M., Kondo, H., Panuthai, S., Ishida, A., Nagai, S., Okamoto, S. 2008. Leaf phenology detected by fixed view camera images in a tropical seasonal forest at Mae Klong, Thailand, Tropical forestry change in a changing world volume 3: GIS/GPS/RS: Applications in natural resources and environmental management. FORTROP II international conference, Kasetsart University, Bangkok, Thailand, 167-181