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Papers by Atsunobu Kadono

Research paper thumbnail of Factors Controlling in situ Decomposition Rate of Soil Organic Matter under Various Bioclimatic Conditions of Eurasia( International Symposium: Challenges to Soil Degradation Towards Sustaining Life and Environment, Tokyo Metropolitan University Symposium Series No.2, 2009)

Research paper thumbnail of Factors controlling in situ decomposition rate of soil organic matter under various bioclimatic conditions of Eurasia

Research paper thumbnail of Comparison of Measurable and Conceptual Soil Organic Carbon Pools Using the RothC Model in Eurasia Steppe Soils Under Different Land Use (Special Issue : International Symposia : Land Degradation and Pedology : Land Degradation and Management : Tokyo Metropolitan University Symposium Series No. 2...

Research paper thumbnail of Factors Controlling Potentially Mineralizable and Recalcitrant Soil Organic Carbon in Humid Asia( International Symposium: Challenges to Soil Degradation Towards Sustaining Life and Environment, Tokyo Metropolitan University Symposium Series No.2, 2009)

Research paper thumbnail of Factors controlling potentially mineralizable and recalcitrant soil organic carbon in humid Asia

Pedologist, 2010

To understand the dynamics of soil organic matter in humid regions in Asia, several soil and mete... more To understand the dynamics of soil organic matter in humid regions in Asia, several soil and meteorological properties were tested to estimate the amounts of potentially mineralizable organic carbon (PMC) and nitrogen (PMN) as well as recalcitrant organic carbon (ROC) and nitrogen (RON). Eighty-nine surface soil samples were collected in Thailand, Indonesia and Japan from cropland and forest ecosystems. The fresh soils were incubated for 133 days under constant temperature and moisture conditions, and CO 2 emissions and mineral N from the soils were monitored. The PMC and PMN were determined by fitting models to the cumulative curves of the CO 2 and mineral N. The ROC and RON were determined by subtracting PMC and PMN from total C and total N, respectively. The soil properties tested included soil pH, sand, silt and clay contents, amounts of the acid oxalate soluble Si, Al and Fe, carbon and nitrogen contents of the light fraction ([LF] < 1.6 g cm-3) and heavy fraction (HF), and the C/N ratio of the LF and HF. The meteorological properties considered were mean annual temperature and precipitation. Using multiple regression analysis and a stepwise method, PMC and PMN was well estimated by the carbon and nitrogen content of LF (LFC and LFN) and the clay content. This suggests the partially labile nature of clay-associating organic matter as well as LFC and LFN. The PMC and PMN were well estimated by LFC and LFN in forest soils and clay contents in cropland soils. Major factors controlling ROC and RON were light fractionorganic matter, amorphous materials and clay content, suggesting the importance of parent materials in estimating the amount of recalcitrant organic matter in humid Asia.

Research paper thumbnail of 第2回 国際土壌判定コンテスト参加報告

Japanese Journal of Soil Science and Plant Nutrition, 2017

Research paper thumbnail of Temperature and moisture dependence of organic matter decomposition in soils from different environments, with special reference to the contribution of light- and heavy-fraction C

Research paper thumbnail of Effect of different land use types of pastoralism on the vegetation and soil in Inner Mongolia, China

Research paper thumbnail of 世界自然遺産としての小笠原諸島

Research paper thumbnail of Distribution pattern of soils in the foothills of the Tienshan and Altai Mountains in Central Eurasia

Research paper thumbnail of Comparison of Measurable and Conceptual Soil Organic Carbon Pools Using the RothC Model in Eurasia Steppe Soils Under Different Land Use

Research paper thumbnail of Radiocarbon as a tool for understanding soil organic matter dynamics

Research paper thumbnail of Effects of Tourism Activities on Grassland Degradation in Hulunbuir Grassland, Inner Mongolia, China

Research paper thumbnail of Modelling of soil organic matter decomposition processes under different ecosystems

Research paper thumbnail of Modelling of carbon flux in grassland ecosystems in Ukraine

For the better understanding of the dynamics of soil organic matter (SOM) in the natural grasslan... more For the better understanding of the dynamics of soil organic matter (SOM) in the natural grassland ecosystem, a simple process-based model is proposed and validated using the values of whole soil respiration (WR) and the microbial soil respiration (MR) measured in Chernozem and Kastanozem soils in Ukraine. Measured input values for the validation were light fraction C (LFC), clay content and plant biomass including shoot and root biomass, daily soil temperature and volumetric water content at 15 cm depth and daily air temperature and precipitation. As an influx of C to the soils, NPP was calculated by Chikugo model using annual temperature and precipitation. For the measured whole soil respiration rate, estimated WR value without root respiration showed close fitting under the drier conditions, probably because of the restricted root respiration. Under the wetter conditions, c.a. 50% of the WR would be attributed to root respiration. For the measured microbial respiration rate, the ...

Research paper thumbnail of Studies on modelling of soil organic matter decomposition processes under different ecosystems

Research paper thumbnail of Long-term tillage and drainage influences on greenhouse gas fluxes from a poorly drained soil of central Ohio

Journal of Soil and Water Conservation, 2014

Atsunobu Kadono is an associate professor at Tottori University of Environmental Studies in Totto... more Atsunobu Kadono is an associate professor at Tottori University of Environmental Studies in Tottori, Japan. Rattan Lal is a distinguisted professor and director of the Carbon Management & Sequestration Center in the School of Environment & Natural Resources at The Ohio State University in Columbus, Ohio. Norman Fausey is a supervisory research soil scientist and research leader with the USDA Agricultural Research Service in Columbus, Ohio.

Research paper thumbnail of Grassland degradation caused by tourism activities in Hulunbuir, Inner Mongolia, China

IOP Conference Series: Earth and Environmental Science, 2014

The recent increase in the number of tourists has raised serious concerns about grassland degrada... more The recent increase in the number of tourists has raised serious concerns about grassland degradation by tourism activities in Inner Mongolia. Thus, we evaluated the effects of tourism activities on the vegetation and soil in Hulunbuir grassland. We identified all the plant species, measured the number and height of plant and plant coverage rate, and calculated species diversity, estimated above-ground biomass in use plot and non-use plot. We also measured soil hardness, and collected soil samples for physical and chemical analysis in both plots. The obtained results were as follows: a) the height of the dominant plants, plant coverage rate, species diversity, and above-ground biomass were significantly lower in use plot than in non-use plot, b) Carex duriuscula C.A.Mey., indicator plant for soil degradation, was dominant in use plot, c) soil hardness was significantly higher in use plot than in non-use plot, and spatial dependence of soil hardness was only found in the use plot, d) CEC, TC, TN and pH in the topsoil were significantly lower in use plot than non-use plot. On the basis of the results, we concluded that the tourism activities can be another major cause of the grassland degradation in Inner Mongolia.

Research paper thumbnail of In situ short-term dynamics of CO2 flux and microbial biomass after simulated rainfall in dry croplands in four tropical and continental ecosystems

Soil Science and Plant Nutrition, 2015

The wet-dry cycles of soil primarily drive carbon (C) dynamics in dry croplands that mainly exper... more The wet-dry cycles of soil primarily drive carbon (C) dynamics in dry croplands that mainly experience sporadic rainfall events. We evaluated the in situ short-term (hourly) dynamics of soil carbon dioxide (CO 2) efflux and microbial biomass, to compare the significance of a single rainfall event with/without C substrate to reveal the effects of a single rainfall on the soil C dynamics in clayey dry croplands in four different climates and ecosystems. The experiments were conducted on four clayey dry croplands as follows: Thailand (TH) and Tanzania (TZ) in tropical climates, and Kazakhstan (KZ) and Hungary (HG) in continental climates. Hourly measurements of soil CO 2 efflux, in situ microbial biomass (MB) and in situ microbial activity (qCO 2) were conducted after the application of simulated rainfall (W plots) and rainfall/glucose (WG plots) treatments. We also evaluated the easily mineralizable carbon (EMC) by incubation. The rainfall treatment caused an increase in the qCO 2 but not in MB, causing a clear but short C flush in all W plots (10-37 h), while the WG treatment caused an increase both of qCO 2 and MB, resulting in substantially longer and larger C flush in the WG plots (ca. 100 h). The ratio of the cumulative soil CO 2 flux caused by rainfall treatment to EMC was larger in TH-W and TZ-W plots (8.2 and 4.9%, respectively) than in the KZ-W and HG-W plots (2.9 and 1.1%, respectively). In addition, applied glucose was more heavily mineralized in the TH-WG and TZ-WG plots (15.0 and 9.7%, respectively) than in the KZ-WG and HG-WG plots (6.4 and 3.4%, respectively), because of the different MB increment patterns for the first 24 h, i.e., immediate and large MB increments in TH and TZ, but not in KZ and HG. These results reveal a possible mechanism that causes the rapid decomposition of soil organic carbon and applied organic matter in the dry tropical cropland.

Research paper thumbnail of Could Soil Acidity Enhance Sequestration of Organic Carbon in Soils?

Soil Carbon, 2014

ABSTRACT On the basis of field and laboratory measurements of the dynamics of soil organic matter... more ABSTRACT On the basis of field and laboratory measurements of the dynamics of soil organic matter (SOM) in Japan, Thailand, Indonesia, Kazakhstan, and Ukraine having different soil pH levels, we postulate that soil acidity plays an important role in the accumulation of SOM through two processes. Firstly, the amount of potentially mineralizable C (C 0) in the acid soils of Kalimantan or light-fraction C in the Japanese acid soils often increased drastically. Hence, it seems that high soil acidity can enhance the accumulation of organic materials in surface soils by decreasing the soil microbial activities for SOM decomposition. Secondly, field measurements of C flux in various soils under forest showed that the internal leaching of dissolved organic carbon (DOC) from litter layers or surface soils increased under low pH conditions, typically for Humods in Japan and Udults in Kalimantan. This indicates a downward movement of DOC in acid soils that increases the tendency of the subsoils to accumulate SOM as organo-mineral complexes. It is concluded that high soil acidity can enhance the storage level of soil organic materials in the form of readily mineralizable organic materials in the surface soils and by organo-mineral complexes formed in subsoils as a result of accelerated leaching of DOC from the O horizon.

Research paper thumbnail of Factors Controlling in situ Decomposition Rate of Soil Organic Matter under Various Bioclimatic Conditions of Eurasia( International Symposium: Challenges to Soil Degradation Towards Sustaining Life and Environment, Tokyo Metropolitan University Symposium Series No.2, 2009)

Research paper thumbnail of Factors controlling in situ decomposition rate of soil organic matter under various bioclimatic conditions of Eurasia

Research paper thumbnail of Comparison of Measurable and Conceptual Soil Organic Carbon Pools Using the RothC Model in Eurasia Steppe Soils Under Different Land Use (Special Issue : International Symposia : Land Degradation and Pedology : Land Degradation and Management : Tokyo Metropolitan University Symposium Series No. 2...

Research paper thumbnail of Factors Controlling Potentially Mineralizable and Recalcitrant Soil Organic Carbon in Humid Asia( International Symposium: Challenges to Soil Degradation Towards Sustaining Life and Environment, Tokyo Metropolitan University Symposium Series No.2, 2009)

Research paper thumbnail of Factors controlling potentially mineralizable and recalcitrant soil organic carbon in humid Asia

Pedologist, 2010

To understand the dynamics of soil organic matter in humid regions in Asia, several soil and mete... more To understand the dynamics of soil organic matter in humid regions in Asia, several soil and meteorological properties were tested to estimate the amounts of potentially mineralizable organic carbon (PMC) and nitrogen (PMN) as well as recalcitrant organic carbon (ROC) and nitrogen (RON). Eighty-nine surface soil samples were collected in Thailand, Indonesia and Japan from cropland and forest ecosystems. The fresh soils were incubated for 133 days under constant temperature and moisture conditions, and CO 2 emissions and mineral N from the soils were monitored. The PMC and PMN were determined by fitting models to the cumulative curves of the CO 2 and mineral N. The ROC and RON were determined by subtracting PMC and PMN from total C and total N, respectively. The soil properties tested included soil pH, sand, silt and clay contents, amounts of the acid oxalate soluble Si, Al and Fe, carbon and nitrogen contents of the light fraction ([LF] < 1.6 g cm-3) and heavy fraction (HF), and the C/N ratio of the LF and HF. The meteorological properties considered were mean annual temperature and precipitation. Using multiple regression analysis and a stepwise method, PMC and PMN was well estimated by the carbon and nitrogen content of LF (LFC and LFN) and the clay content. This suggests the partially labile nature of clay-associating organic matter as well as LFC and LFN. The PMC and PMN were well estimated by LFC and LFN in forest soils and clay contents in cropland soils. Major factors controlling ROC and RON were light fractionorganic matter, amorphous materials and clay content, suggesting the importance of parent materials in estimating the amount of recalcitrant organic matter in humid Asia.

Research paper thumbnail of 第2回 国際土壌判定コンテスト参加報告

Japanese Journal of Soil Science and Plant Nutrition, 2017

Research paper thumbnail of Temperature and moisture dependence of organic matter decomposition in soils from different environments, with special reference to the contribution of light- and heavy-fraction C

Research paper thumbnail of Effect of different land use types of pastoralism on the vegetation and soil in Inner Mongolia, China

Research paper thumbnail of 世界自然遺産としての小笠原諸島

Research paper thumbnail of Distribution pattern of soils in the foothills of the Tienshan and Altai Mountains in Central Eurasia

Research paper thumbnail of Comparison of Measurable and Conceptual Soil Organic Carbon Pools Using the RothC Model in Eurasia Steppe Soils Under Different Land Use

Research paper thumbnail of Radiocarbon as a tool for understanding soil organic matter dynamics

Research paper thumbnail of Effects of Tourism Activities on Grassland Degradation in Hulunbuir Grassland, Inner Mongolia, China

Research paper thumbnail of Modelling of soil organic matter decomposition processes under different ecosystems

Research paper thumbnail of Modelling of carbon flux in grassland ecosystems in Ukraine

For the better understanding of the dynamics of soil organic matter (SOM) in the natural grasslan... more For the better understanding of the dynamics of soil organic matter (SOM) in the natural grassland ecosystem, a simple process-based model is proposed and validated using the values of whole soil respiration (WR) and the microbial soil respiration (MR) measured in Chernozem and Kastanozem soils in Ukraine. Measured input values for the validation were light fraction C (LFC), clay content and plant biomass including shoot and root biomass, daily soil temperature and volumetric water content at 15 cm depth and daily air temperature and precipitation. As an influx of C to the soils, NPP was calculated by Chikugo model using annual temperature and precipitation. For the measured whole soil respiration rate, estimated WR value without root respiration showed close fitting under the drier conditions, probably because of the restricted root respiration. Under the wetter conditions, c.a. 50% of the WR would be attributed to root respiration. For the measured microbial respiration rate, the ...

Research paper thumbnail of Studies on modelling of soil organic matter decomposition processes under different ecosystems

Research paper thumbnail of Long-term tillage and drainage influences on greenhouse gas fluxes from a poorly drained soil of central Ohio

Journal of Soil and Water Conservation, 2014

Atsunobu Kadono is an associate professor at Tottori University of Environmental Studies in Totto... more Atsunobu Kadono is an associate professor at Tottori University of Environmental Studies in Tottori, Japan. Rattan Lal is a distinguisted professor and director of the Carbon Management & Sequestration Center in the School of Environment & Natural Resources at The Ohio State University in Columbus, Ohio. Norman Fausey is a supervisory research soil scientist and research leader with the USDA Agricultural Research Service in Columbus, Ohio.

Research paper thumbnail of Grassland degradation caused by tourism activities in Hulunbuir, Inner Mongolia, China

IOP Conference Series: Earth and Environmental Science, 2014

The recent increase in the number of tourists has raised serious concerns about grassland degrada... more The recent increase in the number of tourists has raised serious concerns about grassland degradation by tourism activities in Inner Mongolia. Thus, we evaluated the effects of tourism activities on the vegetation and soil in Hulunbuir grassland. We identified all the plant species, measured the number and height of plant and plant coverage rate, and calculated species diversity, estimated above-ground biomass in use plot and non-use plot. We also measured soil hardness, and collected soil samples for physical and chemical analysis in both plots. The obtained results were as follows: a) the height of the dominant plants, plant coverage rate, species diversity, and above-ground biomass were significantly lower in use plot than in non-use plot, b) Carex duriuscula C.A.Mey., indicator plant for soil degradation, was dominant in use plot, c) soil hardness was significantly higher in use plot than in non-use plot, and spatial dependence of soil hardness was only found in the use plot, d) CEC, TC, TN and pH in the topsoil were significantly lower in use plot than non-use plot. On the basis of the results, we concluded that the tourism activities can be another major cause of the grassland degradation in Inner Mongolia.

Research paper thumbnail of In situ short-term dynamics of CO2 flux and microbial biomass after simulated rainfall in dry croplands in four tropical and continental ecosystems

Soil Science and Plant Nutrition, 2015

The wet-dry cycles of soil primarily drive carbon (C) dynamics in dry croplands that mainly exper... more The wet-dry cycles of soil primarily drive carbon (C) dynamics in dry croplands that mainly experience sporadic rainfall events. We evaluated the in situ short-term (hourly) dynamics of soil carbon dioxide (CO 2) efflux and microbial biomass, to compare the significance of a single rainfall event with/without C substrate to reveal the effects of a single rainfall on the soil C dynamics in clayey dry croplands in four different climates and ecosystems. The experiments were conducted on four clayey dry croplands as follows: Thailand (TH) and Tanzania (TZ) in tropical climates, and Kazakhstan (KZ) and Hungary (HG) in continental climates. Hourly measurements of soil CO 2 efflux, in situ microbial biomass (MB) and in situ microbial activity (qCO 2) were conducted after the application of simulated rainfall (W plots) and rainfall/glucose (WG plots) treatments. We also evaluated the easily mineralizable carbon (EMC) by incubation. The rainfall treatment caused an increase in the qCO 2 but not in MB, causing a clear but short C flush in all W plots (10-37 h), while the WG treatment caused an increase both of qCO 2 and MB, resulting in substantially longer and larger C flush in the WG plots (ca. 100 h). The ratio of the cumulative soil CO 2 flux caused by rainfall treatment to EMC was larger in TH-W and TZ-W plots (8.2 and 4.9%, respectively) than in the KZ-W and HG-W plots (2.9 and 1.1%, respectively). In addition, applied glucose was more heavily mineralized in the TH-WG and TZ-WG plots (15.0 and 9.7%, respectively) than in the KZ-WG and HG-WG plots (6.4 and 3.4%, respectively), because of the different MB increment patterns for the first 24 h, i.e., immediate and large MB increments in TH and TZ, but not in KZ and HG. These results reveal a possible mechanism that causes the rapid decomposition of soil organic carbon and applied organic matter in the dry tropical cropland.

Research paper thumbnail of Could Soil Acidity Enhance Sequestration of Organic Carbon in Soils?

Soil Carbon, 2014

ABSTRACT On the basis of field and laboratory measurements of the dynamics of soil organic matter... more ABSTRACT On the basis of field and laboratory measurements of the dynamics of soil organic matter (SOM) in Japan, Thailand, Indonesia, Kazakhstan, and Ukraine having different soil pH levels, we postulate that soil acidity plays an important role in the accumulation of SOM through two processes. Firstly, the amount of potentially mineralizable C (C 0) in the acid soils of Kalimantan or light-fraction C in the Japanese acid soils often increased drastically. Hence, it seems that high soil acidity can enhance the accumulation of organic materials in surface soils by decreasing the soil microbial activities for SOM decomposition. Secondly, field measurements of C flux in various soils under forest showed that the internal leaching of dissolved organic carbon (DOC) from litter layers or surface soils increased under low pH conditions, typically for Humods in Japan and Udults in Kalimantan. This indicates a downward movement of DOC in acid soils that increases the tendency of the subsoils to accumulate SOM as organo-mineral complexes. It is concluded that high soil acidity can enhance the storage level of soil organic materials in the form of readily mineralizable organic materials in the surface soils and by organo-mineral complexes formed in subsoils as a result of accelerated leaching of DOC from the O horizon.