Short-Term Effects of Tillage Practices on Soil Organic Carbon Turnover Assessed by delta C-13 Abundance in Particle-Size Fractions of Black Soils from Northeast China
| 第一作者： |
梁爱珍 |
| 英文第一作者： |
Liang, A. Z. |
| 联系作者： |
梁爱珍 |
| 英文联系作者： |
Liang, A. Z. |
| 发表年度： |
2014 |
| 卷： |
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| 摘要： |
The combination of isotope trace technique and SOC fractionation allows a better understanding of SOC dynamics. A five-year tillage experiment consisting of no-tillage (NT) and mouldboard plough (MP) was used to study the changes in particle-size SOC fractions and corresponding delta C-13 natural abundance to assess SOC turnover in the 0-20 cm layer of black soils under tillage practices. Compared to the initial level, total SOC tended to be stratified but showed a slight increase in the entire plough layer under short-term NT. MP had no significant impacts on SOC at any depth. Because of significant increases in coarse particulate organic carbon (POC) and decreases in fine POC, total POC did not remarkably decrease under NT and MP. A distinct increase in silt plus clay OC occurred in NT plots, but not in MP plots. However, the delta C-13 abundances of both coarse and fine POC increased, while those of silt plus clay OC remained almost the same under NT. The C derived from C-3 plants was mainly associated with fine particles and much less with coarse particles. These results suggested that short-term NT and MP preferentially enhanced the turnover of POC, which was considerably faster than that of silt plus clay OC. |
| 刊物名称： |
Scientific World Journal |
| 参与作者： |
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