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

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
47-02-11.pdf447.72 KB

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.

作成者 TORIYAMA Jumpei OHTA Seiichi OHNUKI Yasuhiro IMAYA Akihiro ITO Eriko KANZAKI Mamoru HIRAI Keizo ARAKI Makoto KIYONO Yoshiyuki CHANN Sophal
著者キーワード tropical monsoon forest
公開者 Japan International Research Center for Agricultural Sciences
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 217
終了ページ 226
DOI 10.6090/jarq.47.217
権利 Japan International Research Center for Agricultural Sciences
言語 eng