Plant Soil Environ., 2017, 63(3):125-130 | DOI: 10.17221/817/2016-PSE

Organic carbon content and its liable components in paddy soil under water-saving irrigationOriginal Paper

Yan MA1,2, Junzeng XU*,1,2, Qi WEI1, Shihong YANG1, Linxian LIAO1,2, Suyan CHEN1,2, Qi LIAO1,2
1 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, P.R. China
2 College of Water Conservancy and Hydropower Engineering, Hohai University,

Variation of soil organic carbon (SOC) and its liable fractions under non-flooding irrigation (NFI) were investigated. In NFI paddies, the soil microbial biomass carbon (SMBC) and water extractable organic carbon (SWEC) content in 0-40 cm soil increased by 1.73-21.74% and 1.44-30.63%, and SOC in NFI fields decreased by 0.90-18.14% than in flooding irrigation (FI) fields. As a result, the proportion of SMBC or SWEC to SOC increased remarkably. It is attributed to the different water and aeration conditions between FI and NFI irrigation. The non-flooding water-saving irrigation increased soil microbial activity and mineralization of SOC, which broke down more soil organic nutrients into soluble proportion and is beneficial for soil fertility, but might lead to more CO2 emission and degradation in carbon sequestration than FI paddies.

Keywords: water management; drying-wetting cycle; precipitation; soil carbon sequestration; soil respiration

Published: March 31, 2017  Show citation

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Yan M, Junzeng X, WEI Q, YANG S, LIAO L, CHEN S, LIAO Q. Organic carbon content and its liable components in paddy soil under water-saving irrigation. Plant Soil Environ. 2017;63(3):125-130. doi: 10.17221/817/2016-PSE.
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