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Toriyama J.,Japan Forestry and Forest Products Research Institute | Ohta S.,Kyoto University | Ohnuki Y.,Japan Forestry and Forest Products Research Institute | Ito E.,Hokkaido Research Center | And 7 more authors.
Japan Agricultural Research Quarterly | Year: 2011

We studied the relationships among the soil C stock in tropical monsoon forests, the type of forest, and the environmental factors in the lower Mekong basin in Cambodia. We analyzed nine soil profiles in evergreen and deciduous forests growing over sedimentary rock and basalt. Evergreen forest soils tended to have a larger C stock than deciduous forest soils within geological formations. In evergreen and deciduous forest soils, carbon stocks were 56.9 ± 30.0 (mean ± SD) and 34.9 ± 23.5 Mg C ha -1, respectively, in the 0- to 30-cm depth range, and 108.7 ± 53.0 and 53.2 ± 30.4 Mg C ha -1, respectively, in the 0- to 100-cm depth range. Soil C stock was highly positively correlated with soil water content in the dry season, which is likely affected by the openness of the forest canopy and by soil clay content. © 2011 JIRCAS.


Toriyama J.,Japan Forestry and Forest Products Research Institute | Ohta S.,Kyoto University | Ohnuki Y.,Japan Forestry and Forest Products Research Institute | Imaya A.,Japan Forestry and Forest Products Research Institute | And 6 more authors.
Japan Agricultural Research Quarterly | Year: 2013

Forest soils in the basalt region of Southeast Asia are important natural resources, due to their high agricultural potential and high capacity for carbon sequestration. To characterize the physicochemical properties and the components of the soil organic carbon of forest soils in the basalt region, five evergreen sites (E1-5) and one deciduous forest site (D1) were selected in Cambodia at elevations ranging from 132 to 908 m. The components of the soil organic carbon of each site were separated using a density fractionation approach, i.e. high-(≥ 1.6 g cm-3) and low-(< 1.6 g cm-3) density fractions. Soils of sites E1 and E2, at high elevation (> 600 m), were strongly weathered and characterized by a lower pH, a lower level of exchangeable bases, and a more reddish color than the other evergreen forest soils. The soils of sites E3 and E4, located on a hillside and at the base of a hill, respectively, had a high soil effective cation exchange capacity in the B horizons compared to those at sites E1-2 and E5. The soil of site E5 in the isolated basalt region had characteristics resembling those in sites E1-2 except for its high exchangeable aluminum content. The site D1 soil on a hillside was relatively young and shallow, and black in color. The carbon stock in the six forest sites (0-30 cm in depth) was 40.8-113.7 Mg C ha-1 for high-density fractions and 3.3-7.6 Mg C ha-1 for low-density fractions, respectively. The differences in vegetation types (deciduous vs. evergreen forests), mean annual temperature and free aluminum contents among forest sites were considered factors affecting the carbon content and carbon to nitrogen (C/N) ratio of high-density fractions. It was considered that the variously weathered parent materials, regulated by the relative position in the basalt plateau, were responsible for the gradient of soil morphology and soil nutrient conditions and characterized the soil carbon stock in the study area.

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