K. Hirai

发表

Long-term changes in the chemical properties of Japanese cedar (Cryptomeria japonica) forest soils under high precipitation in southwest Japan

C. Takenaka, Tsuyoshi Yamada, S. Yoshinaga, 2013, Journal of Forest Research.

Soil Carbon Stock in Cambodian Monsoon Forests

Eriko Ito, Jumpei Toriyama, Y. Kiyono, 2011 .

Topographic variation in heterotrophic and autotrophic soil respiration in a tropical seasonal forest in Thailand

Dokrak Marod, S. Panuthai, Masamichi Takahashi, 2011 .

Fate of organic carbon during decomposition of different litter types in Japan

K. Hirai, K. Ono, S. Hiradate, 2013, Biogeochemistry.

Soil Respiration in Different Ages of Teak Plantations in Thailand

Dokrak Marod, S. Panuthai, Masamichi Takahashi, 2009 .

Potassium fertilisation reduces radiocesium uptake by Japanese cypress seedlings grown in a stand contaminated by the Fukushima Daiichi nuclear accident

Junko Nagakura, K. Hirai, K. Noguchi, 2017, Scientific Reports.

Quantitative aspects of heterogeneity in soil organic matter dynamics in a cool‐temperate Japanese beech forest: a radiocarbon‐based approach

S. Miura, S. Ishizuka, Takeshi Saito, 2009 .

Effects of forest conversion to rubber plantation and of replanting rubber trees on soil organic carbon pools in a tropical moist climate zone

Jumpei Toriyama, Y. Kiyono, K. Hirai, 2022, Agriculture, Ecosystems & Environment.

Carbon Cycling in Teak Plantations in Comparison with Seasonally Dry Tropical Forests in Thailand

Dokrak Marod, S. Panuthai, Masamichi Takahashi, 2012 .

Characteristics of Nitrogen Mineralization in the Soil of Japanese Cedar (Cryptomeria japonica) and their Responses to Environmental Changes and Forest Management.

Masamichi Takahashi, T. Sakata, K. Hirai, 2006 .

Sulfate and Nitrate Loads on a Forest Ecosystem in Kochi in Southwest of Japan

Tsuyoshi Yamada, S. Yoshinaga, K. Hirai, 2001 .

Short-term impacts of logging residue at thinning on cation dynamics in Japanese cedar (Cryptomeria japonica)

C. Takenaka, T. Nishizono, Tsuyoshi Yamada, 2015 .

Short-term impacts of logging residue at thinning on cation dynamics in Japanese cedar (Cryptomeria japonica) forest soils in northern Japan

C. Takenaka, T. Nishizono, Tsuyoshi Yamada, 2015 .

Seasonal and snowmelt-driven changes in the water-extractable organic carbon dynamics in a cool-temperate Japanese forest soil, estimated using the bomb-(14)C tracer.

K. Hirai, M. Atarashi-Andoh, J. Koarashi, 2014, Journal of environmental radioactivity.

Carbon isotopes of water‐extractable organic carbon in a depth profile of forest soil imply a dynamic relationship with soil carbon

K. Hirai, M. Atarashi-Andoh, J. Koarashi, 2012 .

Ten-year trends in vertical distribution of radiocesium in Fukushima forest soils, Japan.

S. Miura, T. Sakata, K. Hirai, 2022, Journal of environmental radioactivity.

Effects of vegetation and cultivation on δ13C values of soil organic carbon and estimation of its turnover in Asian tropics: A case study in Thailand

T. Yoneyama, K. Hirai, S. Ando, 2006 .

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.

K. Hirai, K. Ono, S. Hiradate, 2009 .

Transport rates of surface materials on steep forested slopes induced by raindrop splash erosion

S. Miura, Tsuyoshi Yamada, K. Hirai, 2002, Journal of Forest Research.

Slope-induced factors shape bacterial communities in surface soils in a forested headwater catchment

N. Yamashita, Junko Nagakura, Tsuyoshi Yamada, 2022, CATENA.

Sustainable forest biomass: a review of current residue harvesting guidelines

N. Clarke, W. Vries, B. Titus, 2021, Energy, Sustainability and Society.

Atypical Pattern of Soil Carbon Stocks along the Slope Position in a Seasonally Dry Tropical Forest in Thailand

Dokrak Marod, S. Panuthai, Masamichi Takahashi, 2019, Forests.

Nitrogen-fixing activity in decomposing litter of three tree species at a watershed in eastern Japan

T. Yamanaka, Masamichi Takahashi, S. Yoshinaga, 2011, Journal of Forest Research.

Potassium fertilisation reduces radiocesium uptake by Japanese cypress seedlings grown in a stand contaminated by the Fukushima Daiichi nuclear accident

Junko Nagakura, K. Hirai, K. Noguchi, 2017, Scientific Reports.

Factors contributing to soil nitrogen mineralization and nitrification rates of forest soils in the Japanese archipelago

N. Saigusa, H. Shibata, T. Enoki, 2016 .

Humification processes of needle litters on forest floors in Japanese cedar (Cryptomeria japonica) and Hinoki cypress (Chamaecyparis obtusa) plantations in Japan

K. Hirai, K. Ono, S. Hiradate, 2010, Plant and Soil.

Effects of freeze–thaw cycles resulting from winter climate change on soil nitrogen cycling in ten temperate forest ecosystems throughout the Japanese archipelago

H. Shibata, T. Enoki, Y. Suwa, 2014 .

Relationship between the activity concentration of 137Cs in the growing shoots of Quercus serrata and soil 137Cs, exchangeable cations, and pH in Fukushima, Japan.

S. Miura, Junko Nagakura, K. Hirai, 2020, Journal of environmental radioactivity.

Effects of forest type and environmental factors on the soil organic carbon pool and its density fractions in a seasonally dry tropical forest

Jumpei Toriyama, Y. Kiyono, K. Hirai, 2015 .

Seasonal patterns and control factors of CO2 effluxes from surface litter, soil organic carbon, and root-derived carbon estimated using radiocarbon signatures

S. Ishizuka, K. Hirai, M. Atarashi-Andoh, 2012 .

International Workshop on Ecological Knowledge for Adaptation on Climate Change

T. Maeda, T. Nakashizuka, A. Kassim, 2013 .

STUDIES ON SOIL PROTOZOA

K. Hirai, I. Hino, 1926 .

Studies on Soil Protozoa. I. Influence of soil protozoa on nitrogen fixation of Azotobacter

K. Hirai, I. Hino, 1926 .

Biogeochemical nitrogen properties of forest soils in the Japanese archipelago

N. Saigusa, H. Shibata, A. Hayakawa, 2014, Ecological Research.

Dynamics of radiocaesium within forests in Fukushima-results and analysis of a model inter-comparison.

S. Hayashi, G. Shaw, H. Kurikami, 2021, Journal of environmental radioactivity.

National-scale 3D mapping of soil organic carbon in a Japanese forest considering microtopography and tephra deposition

S. Kaneko, J. Iwahashi, M. Inatomi, 2022, Geoderma.

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

K. Hirai, S. Kaneko, Mitsuyoshi Takahashi, 2007 .

Physicochemical Properties and Carbon Storage of Forest Soils on Cambodian Basalt: A Preliminary Study with a Density Fractionation Approach

Eriko Ito, Jumpei Toriyama, Y. Kiyono, 2012 .

Near-infrared reflectance spectroscopy for the determination of lignin-derived compounds in the decomposed and humified litters of coniferous and deciduous temperate forests in Northern Kanto District, Central Japan

K. Hirai, K. Ono, M. Amari, 2008 .