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352 results on '"Kajimoto, T"'

4. Recovery of above-ground tree biomass after moderate selective logging in a central Amazonian forest

Author

Otani T, Lima AJN, Suwa R, Amaral MRM, Ohashi S, Pinto ACM, Dos Santos J, Kajimoto T, Higuchi N, and Ishizuka M

Subjects
Annual Increment, Dynamics, Logistic Growth, Recovery Period, Terra Firme Forest, Forestry, SD1-669.5
Abstract

We examined the recovery and dynamics of living tree above-ground biomass (AGB) after selective logging in an Amazonian terra firme forest managed by a private company. The forest consisted of 24 blocks (including one set aside for conservation) selectively logged in different years on a managed schedule. Trees ≥10 cm in diameter at breast height (dbh) were surveyed in 2006 in 192 0.25-ha plots, in 2010 in 119 plots, and in 2012-2013 in 54 plots. A logistic growth model factoring in logging dynamics and mean AGB of a block in these years was established. Referencing the mean AGB of the unlogged forest, the model indicated that the logged forest would take on average 14 years to regain its preharvest AGB after selective logging at 1.9 trees ha-1 (dbh > 50 cm). In 2010 and 2012-2013, the AGB increased significantly for small and large trees (10-20 cm and >60 cm dbh, respectively) in the logged forest. In contrast, it decreased significantly for medium-sized trees (30-50 cm dbh) in the unlogged forest. Comparisons with the previous studies mainly conducted in the other regions of Amazon suggested that the estimated AGB recovery period with moderate logging intensity was almost appropriate and likely acceptable to forest managers.

Published
2018
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12. Respiration of Larch trees

Author

Mori, S., Prokushkin, S. G., Masyagina, O. V., Ueda, T., Osawa, A., Kajimoto, T., Osawa, Akira, editor, Zyryanova, Olga A., editor, Matsuura, Yojiro, editor, Kajimoto, Takuya, editor, and Wein, Ross W., editor

Published
2010
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21. Respiration of Larch trees

Author

Mori, S., primary, Prokushkin, S. G., additional, Masyagina, O. V., additional, Ueda, T., additional, Osawa, A., additional, and Kajimoto, T., additional

Published
2009
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29. Distributions of neutron yield and dose around a water phantom bombarded by 290-MeV/nucleon and 430-MeV/nucleon carbon ions

Author

Satoh, D., Kajimoto, T., Shigyo, N., Itashiki, Y., Imabayashi, Y., Matsufuji, Naruhiro, Sanami, T., Nakao, N., and Uozumi, Y.

Subjects
Physics::Medical Physics, Nuclear Theory, Nuclear Experiment
Abstract

Double-differential neutron yields from a water phantom bombarded by 290-MeV/nucleon and 430-MeV/nucleon carbon ions were measured at production angles of 15°, 30°, 45°, 60°, 75°, and 90°, and angular distributions of neutron yield and dose around the phantom were obtained. The experimental data were compared with the results of the Monte-Carlo simulation code, PHITS. The PHITS results showed a good agreement with the measured data. In addition, we estimated the angular distributions of neutron yield and dose from 0° to 180° including thermal neutrons using PHITS.

Published
2016

31. Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra firme forest

Author

Ohashi, S, Durgante, FM, Kagawa, A, Kajimoto, T, Trumbore, SE, Xu, X, Ishizuka, M, and Higuchi, N

Abstract

© 2015 Springer-Verlag Berlin Heidelberg In Amazonian non-flooded forests with a moderate dry season, many trees do not form anatomically definite annual rings. Alternative indicators of annual rings, such as the oxygen (δ18Owc) and carbon stable isotope ratios of wood cellulose (δ13Cwc), have been proposed; however, their applicability in Amazonian forests remains unclear. We examined seasonal variations in the δ18Owc and δ13Cwc of three common species (Eschweileracoriacea, Iryantheracoriacea, and Protiumhebetatum) in Manaus, Brazil (Central Amazon). E. coriacea was also sampled in two other regions to determine the synchronicity of the isotopic signals among different regions. The annual cyclicity of δ18Owc variation was cross-checked by 14C dating. The δ18Owc showed distinct seasonal variations that matched the amplitude observed in the δ18O of precipitation, whereas seasonal δ13Cwc variations were less distinct in most cases. The δ18Owc variation patterns were similar within and between some individual trees in Manaus. However, the δ18Owc patterns of E. coriacea differed by region. The ages of some samples estimated from the δ18Owc cycles were offset from the ages estimated by 14C dating. In the case of E. coriacea, this phenomenon suggested that missing or wedging rings may occur frequently even in well-grown individuals. Successful cross-dating may be facilitated by establishing δ18Owc master chronologies at both seasonal and inter-annual scales for tree species with distinct annual rings in each region.

Published
2015

40. Measurement of Thick Target Neutron Energy Spectra at 15° and 90° Bombarded with 120-GeV Protons

Author

IWAMOTO, Y., primary, SANAMI, T., additional, KAJIMOTO, T., additional, SHIGYO, N., additional, HAGIWARA, M., additional, LEE, H.S., additional, SOHA, A., additional, RAMBERG, E., additional, COLEMAN, R., additional, JENSEN, D., additional, LEVELING, A., additional, MOKHOV, N.V., additional, BOREHEN, D., additional, VAZLI, K., additional, SAKAMOTO, Y., additional, and NAKASHIMA, H., additional

Published
2012
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