Effect of Soil Moisture on Mineralization of Soil Carbonin Calcareous Soils in the Semi-arid Regions of China
JIA Junxian
YU Yaozhou
ZHANG Jian
XU Jianmin
ZHANG Yali
ZHAO Yan
HONG Jianping
Abstract：This paper studied the impact of soil moisture on mineralization of organic carbon (SOC) mineralization in calcareous soils inthe semi-arid region of northern China.During the experiment,the temperature was kept at constant and the soil moisture varied from 40％ to 100％ of water holding capacity of the soils (WHC).Three calcareous soils-chestnut soil,chestnut brown soil and cinnamon soil-were examined.The results showed that the cumulative mineralization and the mineralization rate of SOC in maize and orchard fields in the three calcareous soils all increased with soil moisture,but the increase in the high moisture treatments,70％～100％ WHC,was less than those in the low moisture treatments,40％～70％ WHC.The SOC mineralization was well described by the first-order kinetics,where the soil organic carbon (Cp) varied from 33.10 to 193.56 mg/kg and the mineralization rate (Cp/SOC) varied from 0.41％ to 3.35％ respectively.Both Cp and Cp/SOC increased with soil moisture.Similarly,the increase in Cp and Cp/SOC in the high moisture treatments was higher than those in the low moisture treatments.The Cp/SOC was negatively correlated with SOC and clay content (P＜0.05) under 40％ and 70％ and 100％ of WHC.In conclusion,the soil moisture has a great impact on soil organic carbon mineralization and carbon sequestration.
Keywords：soil moisturesoil organic carbon mineralizationchestnut soilchestnut brown soilcinnamon soil
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 62-68 )