Keisuke Toyama

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Name
Keisuke Toyama
Nickname
K_Toyama
E-mail
toyamauf.a.u-tokyo.ac.jp

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當山 啓介, 金井 敬宏, 三次 充和, 江口 誠一
東京大学農学部演習林報告 = Bulletin of The University of Tokyo Forests   (139) 1-15   Oct 2018
We investigated the spatial distribution, shape, and composition of charcoal kilns that remain within the forest of The University of Tokyo Chiba Forest on the southern Boso Peninsula, eastern Japan. Although the 66 charcoal kilns investigated in ...
Shirasawa Hiroaki, Aruga Kazuhiro, Yamamoto Takahisa, Toyama Keisuke, Hiroshima Takuya
The Japanese Forest Society Congress   129(0)    2018
<p>[in Japanese]</p>
Nishizono Tomohiro, Zushi Kotaro, HIroshima Takuya, Toyama Keisuke, Kitahara Fumiaki, Terada Fumiko, Takagi Masakihiro, Saito Satoshi
The Japanese Forest Society Congress   129(0)    2018
<p>[in Japanese]</p>
Toyama Keisuke
The Japanese Forest Society Congress   129(0)    2018
<p>[in Japanese]</p>
Owari Toshiaki, Sakaue Daisuke, Toyama Keisuke, Nakamura Kazuhiko, Jayathunga Sadeepa, Koike Yukihiro, Tokuni Masaki, Inoue Takashi, Kimura Kota
The Japanese Forest Society Congress   129(0)    2018
<p>[in Japanese]</p>
Ishibashi Seiji, Toyama Keisuke, Saito Haruo
The Japanese Forest Society Congress   128(0)    2017
<p>[in Japanese]</p>
Saito Haruo, Ishibashi Seiji, Toyama Keisuke
The Japanese Forest Society Congress   128(0)    2017
<p>[in Japanese]</p>
Toyama Keisuke, Aruga Kazuhiro
The Japanese Forest Society Congress   128(0)    2017
<p>[in Japanese]</p>
Yamamoto Takahisa, Aruga Kazuhiro, Furusawa Takeshi, Toyama Keisuke, Suzuki Yasushi, Shirasawa Hiroaki
J. Jpn. For. Soc.   99(6) 266-271   2017
<p>This study estimated the supply potential and availability of unused materials for woody biomass power generation in the Japanese cedar and cypress forests of Tochigi Prefecture. Then, the long-term possibility of supplying fuel woods to the ex...
Toyama Keisuke, Aruga Kazuhiro, Suzuki Yasushi
J. Jpn. For. Soc.   99(6) 251-258   2017
<p> We used a simulator, which can estimate profits of woodland owners from the management of individual forest stands based on numerous sets of forestry-related parameters such as log prices, to identify the most profitable clearcutting rotation ...
Suzuki Yasushi, Aruga Kazuhiro, Yoshioka Takuyuki, Toyama Keisuke, Saito Masashi, Sirasawa Hiroaki, Yamasaki Shin
J. Jpn. For. Soc.   99(6) 272-277   2017
<p>There are two woody biomass electric power generation plants in Kochi Prefecture, one (T) in the central area and the other (G) in the western area. Both started operation in 2015 with output levels of 6 MW, each requiring 70,000 to 90,000 m<su...
TOYAMA Keisuke
JOURNAL OF JAPAN SOCIETY OF HYDROLOGY & WATER RESOURCES   30(6) 407-407   2017
&emsp;森林計画分野には「計画し実行すること」そのものの技術の改良が求められていると思われ,そのような知見は水利科学分野との協働にも役立つものだと考える.
TOYAMA Keisuke
FOREST ECONOMY   70(8) 1-9   2017
保続の担保や収穫規整といった伐採管理とそれに対する森林計画制度の対応について整理した。伐採を推奨または制約すべき量の理論およびその実効性は森林計画制度において乏しいとともに、森林計画制度における伐採管理の意義が十分なコンセンサスを得ていないとも考えられ、理論と技術の両面を向上させていく必要がある。
當山 啓介, 広嶋 卓也, 白石 則彦
森林計画学会誌   49(2) 75-81   Mar 2016
Toyama Keisuke, Hiroshima Takuya, Shiraishi Norihiko
JFP   49(2) 75-81   2016
<p>In the new Collective Forest Management Plan System in Japan, introduced in 2012, a formula similar to the Austrian formula is used to define the maximum clearcutting volume,andthe standard cutting cycle is considered anadjustment period. Howev...
TOYAMA Keisuke
Proc. Conf. Biomass Sci.   11(0) 163-164   2016
In a case of broadleaved forest harvesting in Sakai City, Fukui Prefecture, I estimated volume of standing trees using data of measured diameter and height, and also measured diameter and height of stumps. Dominant species were Oak species, Magnol...
Suzuki Yasushi, Aruga Kazuhiro, Yoshioka Takuyuki, Toyama Keisuke
The Japanese Forest Society Congress   127(0)    2016
[in Japanese]
Ishibashi Seiji, Toyama Keisuke, Saito Haruo
The Japanese Forest Society Congress   127(0)    2016
[in Japanese]
Toyama Keisuke, Aruga Kazuhiro
The Japanese Forest Society Congress   127(0)    2016
HASHIMOTO Tomoyuki, TOMITA Takashi, MORI Shigeru, SAWABE Kyoko, KAZUMA Tohru, MUTO Atsuhiko, MINAGAWA Keiko, NAGAHIRO Kana, TOYAMA Keisuke, ADACHI Masaya, IKEDA Fumiaki, KOMAGATA Osamu
Med. Entomol. Zool.   66(1) 7-12   2015
A field evaluation of the acaricidal effect on ticks was conducted in Chiba Prefecture in 2014. Eleven formulations of organophosphates and pyrethroids, including emulsifiable concentrate (EC), flowable (FL), dust and CO2 gas formulatio...
Toyama Keisuke
The Japanese Forest Society Congress   126(0)    2015
[in Japanese]
陳 敬忠, 中島 徹, 當山 啓介, 白石 則彦
東京大学農学部演習林報告 = Bulletin of the University of Tokyo Forests   (131) 1-27   Jun 2014
Although there is a large amount of growth data in various forms from plantation forests, it is difficult to use them in multi-purpose practice due to different management conditions and differing data formats. It is conceivable that applying info...
TOYAMA Keisuke, HISAMOTO Yoko, HIROSHIMA Takuya, YAMADA Toshihiro, YAMANAKA Ikuo, SUTO Tomohiro, MAEDA Kiyoto, EGAMI Hiroshi, MURAKAMI Hideki
Med. Entomol. Zool.   65(4) 189-194   2014
Japanese land leeches (Haemadipsa zeylanica japonica Whitman) are bloodsucking parasites inhabiting in woodland areas. In order to examine killing effect of malic acid on the leeches, we conducted outdoor spraying tests using malic acid as ...
Yamada Toshihiro, Toyama Keisuke, Hisamoto Yoko, Hiroshima Takuya, Suto Tomohiro, Maeda Kiyoto, Egami Hiroshi
The Japanese Forest Society Congress   125(0)    2014
[in Japanese]
Toyama Keisuke
The Japanese Forest Society Congress   125(0)    2014
[in Japanese]
YAMANAKA Ikuo, TOYAMA Keisuke, HISAMOTO Yoko, HIROSHIMA Takuya, YAMADA Toshihiro
J.Jpn.Soc.Reveget.Tech.   39(4) 496-502   2013
In the Kiyosumi area of the University of Tokyo Chiba Forest, located in the southeast of the Boso Peninsula, we analyzed the relationship among Sika deer (Cervus nippon) population density, damage caused by Sika deer to planted Sugi (<I...
Toyama Keisuke
The Japanese Forest Society Congress   124(0)    2013
森林施業計画に代わって森林経営計画の運用が始まり,該当林班面積1/2以上制約,haあたり搬出材積下限制約、間伐面積下限制約など計画作成上達成すべきハードルがある。計画作成に当たり、個々の森林は基本的に「自らが置かれた条件の下で努力するしかない」が、連たん複数林班の合同、除外小班を設けるかなど裁量の余地も有りうる。一方で、公益的機能発揮への取組は計画の重要な視点であるが、地形等の理由で環境制約を設けることの影響は明らかではない。本研究は、現状の森林経営計画制度を基に、作成のスケールの違いや河...
Tatsuhara Satoshi, Toyama Keisuke, Suzuki Makoto
The Japanese Forest Society Congress   124(0)    2013
高齢人工林を強度間伐後に樹下植栽した人工二段林に対して下木植栽後20年間の生育状況について調査した。上木はスギで90年生時に本数割合50%、材積割合30%で強度間伐を行った。間伐の翌年、スギとヒノキを樹下植栽した。斜面方向と平行にA区からE区までの約0.1haの5つの区画を林内に設置した。上木の立木本数はA区で6%、B区で4%ほど枯損によって減少した。枯損の原因は幹折れであった。上木の林分材積は間伐後20年で間伐直前の水準に回復した。下木の植栽本数は2,150本/haであったが、スギの18...
Toyama Keisuke, Tatsuhara Satoshi, Shiraishi Norihiko
J. Jpn. For. Soc.   94(6) 269-279   2012
We established a simulator which can estimate profits from management of individual stands for landowners under numerous sets of parameters considering; diversity of logging, growth and social conditions, and analyzed most profitable timing for th...
TOYAMA Keisuke, TATSUHARA Satoshi
JFP   45(1) 1-7   2011
We simulated to what extent cable logging cost will be reduced and what kind of effects will be made on the spatial distribution of harvested stands by integrating adjoining private stands. Study site is 2,229ha private sugi(Cryptomeria japonica) ...
Kurokochi Hiroyuki, Toyama Keisuke, Hogetsu Taizo
The Japanese Forest Society Congress   122(0) 154-154   2011
TOYAMA KEISUKE, TATSUHARA SATOSHI, SHIRAISHI NORIHIKO
The Japanese Forest Society Congress   122(0) 231-231   2011
Chen Jingzhong, Hiroshima Takuya, Toyama Keisuke, Shiraishi Norihiko
The Japanese Forest Society Congress   123(0) Pb102-Pb102   2011
TOYAMA KEISUKE
The Japanese Forest Society Congress   123(0) Pb133-Pb133   2011
Toyama Keisuke, Shiraishi Norihiko
The Japanese Forest Society Congress   121(0) 63-63   2010
Kurokochi Hiroyuki, Toyama Keisuke, Hogetsu Taizo
The Japanese Forest Society Congress   120(0) 15-15   2009
Toyama Keisuke, Shiraishi Norihiko
The Japanese Forest Society Congress   120(0) 495-495   2009
TOYAMA KEISUKE, TATSUHARA SATOSHI, SHIRAISHI NORIHIKO
The Japanese Forest Society Congress   119(0) 71-71   2008
TOYAMA Keisuke, TATSUHARA Satoshi
JFP   41(2) 169-178   2007
We calculated the logging cost in clearcutting using the Endless Tyler system and tower yarder system under various stand and setting conditions using existing logging costs functions, and showed the quantitative effects of variables, including th...
Toyama Keisuke, Tatsuhara Satoshi, Shiraishi Norihiko
The Japanese Forest Society Congress   118(0) 155-155   2007