天然林(熱帯雨林、熱帯半常緑雨林、熱帯乾燥常緑林、マングローブ林、温帯林)および人工林を対象とした、
1.樹木の生態生理過程
  (光合成、呼吸、転流、蒸散、樹液流、水ポテンシャル、無機栄養、  成長の季節性)の解明

2.森林群落の種組成、林分構造、林分動態、林内微気象、物質生産 、物質循環の解明
3.森林生態系の保全・修復・再生技術の開発

長い間やっているので,森の木と話すことができるようになりました。

山が好き,森が好き,木が好きな少年が,そのまま大人になり,気がついたらこのなりわいでくらしていました。

世界の森林で得た知識を活かし,裏山を守り育ていこうと思っています。

研究の内容
研究の魅力
研究を始めたきっかけ
今後の展望
最近の業績(2003〜)
Detecting tree populations at risk: Using single-year VS long-term inventory data. Masao Kohira, Ikuo Ninomiya, Forest Ecology and Management, 174 423-435, 2003.

Photosynthetic activity in seed wings of Dipterocarpaceae in a masting year: Does wing photosynthesis contribute to reproduction?
T.KENZO, T. ICHIE, I. NINOMIYA and T. KOIKE, PHOTOSYNTHETICA 41(4): 551-557, 2003

The effect of stand-age and inundation on the carbon accumulation in soil of mangrove plantation in Namdinh, northern Vietnam. Ha T.N., Yoneda R., Ninomiya I., Tan V.D., Tuan M.S. and Hong N.P.:  TROPICS 14(1):21-37, 2004

Inter-specific variation of photosynthesis and leaf characteristics in five canopy trees of Dipterocarpaceae in a tropical rain forest. T.Kenzo,T. Ichie, R.Yoneda,Y.Kitahashi, Y. Watanabe, I. Niomiya, Koike, T. Tree Phsiology, Tree Physiology, 2004, 24: 1187-1192

Short-term drought causes synchronous leaf shedding and flushing in alowland mixed dipterocarp forest, Sarawak, Malaysia. Tomoaki Ichie, Toru Hiromi Reiji Yoneda Koichi Kamiya, Masao Kohira,Ikuo Ninomiya and Kazuhiko Ogino.Journal of Tropical Ecology 20:697―700. 2004

Effects of controlled-release fertilizer on growth and ectomycorrizal colonization of pot-grown seedlings of the Dipterocarp Dryobalanops lanceolata in a tropical nursery. Kazuo Okamura Irino , Yumie Lba, Satoshi Ishizuka, Tanaka Kenzo, Semilan Ripot, Jasepgh Jawa Kendawang, Noya Miyashita, Kazuhide Nara, Taiozo Hogetsu, Ikuo Ninomiya, Kozo Iwasaki and Katsutoshi Sakurai Soil Science and Plat Nutritios, 50(5):747-753. 2004

Effects of shifting cultivation on soil ecosystems in Sarawak, Malaysia. I. Slash and burning at Balai Ringin and Sabal experimental sites and effect on soil organic matter. Kendawang JJ, Tanaka S, Ishihara J, Shibata K, Sabang J, Ninomiya I,Ishizuka S, Sakurai K Soil Sci. Plant Nutr., 50(5), 677-687, 2004

Effects of shifting cultivation on soil ecosystems in Sarawak, Malaysia. II. Changes in soil chemical properties and runoff water at Balai Ringin and Sabal experimental sites. Tanaka S, Kendawang JJ, Ishihara J, Shibata K, Kou A, Jee A, Ninomiya I and Sakurai K Soil Sci. Plant Nutr., 50 (5),689-699, 2004

Soil characteristics under three vegetation types associated with shifting cultivation in a mixed Dipterocarp forest in Sarawak, Malaysia. Hattori, D., Sabang, J., Tanaka, S., Kendawang, J. J., Ninomiya, I. and Sakurai, K.Soil Sci. Plant Nutr., 51(2):231-241, 2005

ヒノキの成長促進によってニホンキバチの産卵は抑制されるか?稲田哲治・前藤 薫・二宮生夫日林誌 87(2):145−148,2005

中国内蒙古自治区に生育する臭柏(Sabina vulgaris Ant.)稚樹の異形葉性と生育段階にともなう資源配分特性 田中憲蔵・小田あゆみ・二宮生夫・王 林和・張 国盛・坂本圭児・吉川 賢
 日本緑化工学会誌 30(4):657−661,2005

松枯れ後に成立した二次林を構成する低木・亜高木種の萌芽特性 菅原未知登・林田光祐・田中憲蔵・二宮生夫   森林立地 47(1):39−46,2005

Performance of pot-grown seedlings of Dipterocarp Dryobalanops lanceolata  with controlled-release fertilizer after tasnplantation to the shifting cultivation land in Sarawak, Malaysia
 Kazuo Okamura Irino, Yumei Kang, Kenzo Tanaka, Daisuke Hattori, Satoshi Ishizuka, Ikuo Ninomiya, Kozo Iwasaki, Joseph Jawa Kendawang, Katsutoshi Sakurai
. Soil Sci. Plant Nutr., 51(3):369-377, 2005

Effects of shifting cultivation on soil ecosystems in Sarawak, Malaysia. III. Results of burning practice and changes in soil organic matter at Niah and Bakam experimental sites. Kendawang JJ, Tanaka S, Shibata K, Yoshida, N.,  Sabang J, Ninomiya, I., Sakurai K. Soil Sci. Plant Nutr., 514, 515-523, 2005

Effects of shifting cultivation on soil ecosystems in
 Sarawak, Malaysia. IV. Chemical properties of the soil and runoff water at Niah and Bakam experimental sites. Tanaka S, Kendawang J.J., Yoshida, N., Shibata K, Jee, A., Tanaka, K., Ninomiya I and Sakurai K. Soil Sci. Plant Nutr., 51 (4),525-533, 2005


Changes in photosynthesis and leaf characteristics with tree height in five dipterocarp species in a tropical rain forest. TANAKA KENZO, TOMOAKI ICHIE, YOKO WATANABE, REIJI YONEDA, IKUO NINOMIYA TAKAYOSHI KOIKE. Tree Physiology 26, 65-873,2006

Effects of burning strength in shifting cultivation on the early stage of secondary succession in Sarawak, Malaysia. Kendawang, J. J., Ninomiya, I, Kenzo, T., Ozawa, T., Hattori, D., Tanaka, S., Sakurai, K.TROPICS 16:300-321, 2007

Leaf physiological and morphological responses of seven dipterocarp seedlings to degraded forest environments in Sarawak, MalaysiaA case study of forest rehabilitation practice Tanaka Kenzo, Tomoaki Ichie, Tomoko Ozawa, Seiichi Kashimura, Daisuke Hattori, Kazuo O. Irino, Joseph Jawa Kendawang, Katsutoshi Sakurai, Ikuo Ninomiya. TROPICS 17(1): 1-16, 2007

上層木伐採が択伐残存林下に植栽したフタバガキ科樹木6種の成長と光合成特性に与える影響.田中憲蔵・服部大輔・櫻井克年・J.J.Kendawang・二宮生夫:  関東森林研究58: 105-108. (2007 )

Belowground carbon accumulation in young Kandelia candel (L.) Blanco plantation in Thai Binh River Mouth, Northern Vitenum. Nguyen Thi Kim Cuc, Ikuo Ninomiya, Nguyen Tuan Long, Nguyen Hoang Tri, Mai Sy Tuan, Phan Nguyen Hong. International Journal of Ecology and Development. In press.