Staff (FFPRI side)

hirai

Keizo HIRAI


Position: Head of Nutrient Dynamics Laboratory, Department of Forest Site Environment, FFPRI


Mail Address: hirai atmark ffpri.affrc.go.jp


Research Subjects: Nitrogen mineralization; Nutrient cycling; Forest soil


Selected Publications:

  1. Takahashi M., Marod D., Panuthai S., Hirai K. (2012) Carbon Cycling in Teak Plantations in Comparison with Seasonally Dry Tropical Forests in Thailand. In: Blanco JA and Lo YH (eds.) Forest Ecosystems - More than Just Trees. InTech, pp209-230 logo_pdf

  2. Takahashi M., Hirai K., Limtong P., Leaungvutivirog C., Panuthai S., Suksawang S., Anusontpornperm S, Marod D. (2011) Topographic variation in heterotrophic and autotrophic soil respiration in a tropical seasonal forest in Thailand．Soil Science and Plant Nutrition 57(3):452-465. 10.1080/00380768.2011.589363

  3. Yamanaka, T., Hirai, K., Aizawa, S., Yoshinaga, S., Takahashi. M. (2011) Nitrogen-fixing activity in. decomposing litter of three tree species at a watershed in eastern Japan. Journal of Forest Research 17: 1-7. DOI: 10.1007/s10310-010-0201-1

  4. Takahashi, M., Hirai. K., Limtong, P., Leaungvutivirog, C., Suksawang, S., Panunthai, S., Anusontpornperm, S., Marod, D. (2009) Soil respiration in different ages of teak plantations in Thailand. Japan Agricultural Research Quarterly 43:337-343. logo_pdf

  5. Ono, K., Hirai, K., Morita, S., Ohse, K., Hiradate, S. (2009) Organic carbon accumulation processes on a forest floor during an early humification stage in a temperate deciduous forest in Japan: Evaluations of chemical compositional changes by 13C NMR and their decomposition rates from litterbag experiment. Geoderma151:351-356. DOI: 10.1016/j.geoderma.2009.05.001

  6. Hirai, K., Kaneko, S., Takahashi, M. (2007) Nitrogen mineralization of forest soil along the climate in Japan: estimation of rate of nitrogen mineralization in the field by soil properties, temperature and soil type. Japanese Journal of Forest Environment 49:123-131 (in Japanese).

  7. Yoneyama, T., Okada, H., Chongpraditnum, P., Ando, S., Prasertsak, P., HIRAI, K.(2006) Effects of vegetation and cultivation on 13C values of soil organic carbon and estimation of its turnover in Asian tropics: A case study in Thailand . Soil Science and Plant Nutrition. 51: 95-102. DOI: 10.1111/j.1747-0765.2006.00001.x

  8. Hirai, K., Ferraz, J., Ferreira, S., Kobayashi, M. (2005) Change in physical properties of Ferralsols with tree planting in the central Amazon, Brazil. Soil Science and Plant Nutrition. 51: 761-765. DOI: 10.1111/j.1747-0765.2005.tb00108.x


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