Effect of Cultivation on Dynamics of Organic and Inorganic Carbon Stocks in Songnen Plain
| 第一作者： |
禹朴家 |
| 英文第一作者： |
Yu, P. J. |
| 联系作者： |
周道玮 |
| 英文联系作者： |
Zhou, D. W. |
| 发表年度： |
2014 |
| 卷： |
106 |
| 摘要： |
The accurate estimation of soil C stock is important for understanding the global C cycles. Particularly in arid regions, quantification of soil inorganic carbon (SIC) is required in addition to the more frequently reported soil organic carbon (SOC). We analyzed SOC, SIC, soil bulk density (BD), electrical conductivity (EC) and pH of alkali-saline soils at a 0- to 100-cm depth in a cultivation chronosequence that consisted of a meadow steppe site and four cropped sites with maize (Zea mays L.) for 1, 7, 17, and 24 yr in Songnen Plain, Northeast China to quantify SOC and SIC dynamics. Results showed that SOC stock in 0 to 100 cm soil was 92.3, 83.7, 80.9, 78.2, and 76.9 Mg C ha(-1) for Steppe, Crop-1Y, Crop-7Y, Crop-17Y, and Crop-24Y, respectively, decreased at a rate of 3.63 Mg C ha(-1) yr(-1). In contrast, SIC stock, ranging from 159.0 to 179.4 Mg C ha-1 increased at a rate of 0.53 Mg C ha(-1) yr(-1) in 0- to 100-cm depth. The soil total carbon (STC) stock increased at a rate of 0.46 Mg C ha-1 yr-1 following land use conversion, peaked in the seventh year of cultivation and then declined at a rate of 0.89 Mg C ha-1 yr. SOC concentrations were negatively correlated with BD, EC, and pH, but SIC concentrations were positively correlated with soil BD, EC, and pH. The findings underline the importance of including SIC in the soil C estimates while considering deep soil profile and longer cultivation period. |
| 刊物名称： |
Agronomy Journal |
| 参与作者： |
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