国立研究開発法人 国際農林水産業研究センター | JIRCAS

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
本文フルテキスト

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.

刊行年月2013-04-01
作成者TORIYAMA JumpeiOHTA SeiichiOHNUKI YasuhiroIMAYA AkihiroITO ErikoKANZAKI MamoruHIRAI KeizoARAKI MakotoKIYONO YoshiyukiCHANN Sophal
著者キーワード

tropical monsoon forest

公開者Japan International Research Center for Agricultural Sciences
データ作成日2013-04-01
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
47
2
開始ページ217
終了ページ226
DOI10.6090/jarq.47.217
権利Japan International Research Center for Agricultural Sciences
言語eng