| Cite this article: | 贾俊仙,蔚耀洲,张键,等.土壤水分对半干旱区石灰性土壤有机碳矿化的影响[J].灌溉排水学报,2017,36(9):. |
| JIA Junxian,YU Yaozhou,ZHANG Jian,et al.土壤水分对半干旱区石灰性土壤有机碳矿化的影响[J].灌溉排水学报,2017,36(9):. |
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| DOI： |
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| Effect of Soil Moisture on Mineralization of Soil Carbonin Calcareous Soils in the Semi-arid Regions of China |
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JIA Junxian, YU Yaozhou, ZHANG Jian, XU Jianmin, ZHANG Yali, ZHAO Yan, HONG Jianpin
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Shanxi Agricultural University, Taigu 030801, China; State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
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| 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. |
| Key words: soil moisture; soil organic carbon mineralization; chestnut soil; chestnut brown soil; cinnamon soil |
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