期刊
AUSTRALIAN JOURNAL OF SOIL RESEARCH
卷 45, 期 1, 页码 33-40出版社
CSIRO PUBLISHING
DOI: 10.1071/SR06077
关键词
C accumulation; C mineralisation; microbial biomass C; soil organic C; particulate organic C
类别
Land use changes, especially the conversion of native forest vegetation to cropland and plantations in tropical regions, can potentially alter soil C dynamics. A study was conducted to assess the effects of various land uses and soil managements (agro-forestry plantation, vegetable field, tube-well irrigated rice-wheat, sewage-irrigated rice-wheat, and uncultivated soils) on soil pH, bulk density, soil organic C(SOC), particulate organic C(POC), microbial biomass C(MBC), C mineralisation (C-min), microbial quotient, and microbial metabolic quotient (q(CO2)) in 0-0.05, 0.05-0.10, and 0.10-0.20 m soil depths. At 0-0.05 m, the bulk density was lowest (1.29 Mg/m(3)) in agro-forestry soil, whereas the uncultivated soil ( jointly with vegetable field soil) showed highest bulk density (1.48 Mg/m(3)). Sewage-irrigated rice-wheat soil showed lowest pH particularly in the 0-0.05 and 0.10-0.20m soil layer. Irrespective of soil depths, agro-forestry plantation showed greater SOC followed by sewage-irrigated rice-wheat soil. Nevertheless, agro-forestry soil also showed highest stock of SOC (33.7 Mg/ha), POC (3.58 Mg/ha), and MBC (0.81 Mg/ha) in the 0-0.20m soil layer. Sewage-irrigated rice-wheat jointly with agro-forestry soil showed greatest Cmin in the 0-0.20m soil layer, although the former supported lower SOC stock. The decrease in SOC (SOC0-0.05m/SOC0.10-0.20m) and C-min (Cmin0-0.05m/Cmin0.10-0.20m) along soil depth was significantly higher in the agro-forestry system than in most of the other land use and soil management systems. Microbial quotient was highest in sewage-irrigated rice-wheat soil, particularly in the 0-0.05m soil depth, whereas qCO2 was greater in uncultivated soil. In general, microbial quotients decreased, whereas q(CO2) increased down the soil pro. le.
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