Least limiting water range and soil pore-size distribution related to soil organic carbon dynamics following zero and conventional tillage of a black soil in Northeast China
| 第一作者： |
陈学文 |
| 英文第一作者： |
Chen, X. W. |
| 联系作者： |
梁爱珍 |
| 英文联系作者： |
Liang, A. Z. |
| 发表年度： |
2015 |
| 卷： |
153 |
| 摘要： |
The present work built on a previous study of tillage trials, which found the effectiveness of least limiting water range (LLWR) as an indicator of soil organic carbon (SOC) mineralization under different tillage practices in a black soil of Northeast China in 2009. To improve the understanding of soil structure controls over SOC dynamics, a study was conducted to explore the relationship between LLWR, which was calculated based on soil bulk density and soil pore-size distribution, and the effects of LLWR, which was calculated based on soil bulk density and soil pore-size distribution on SOC mineralization following no tillage (NT) and mouldboard ploughing (MP). In contrast to MP, NT had a significantly greater volume of large macropores (> 100 mu m) at depths of 0-0.05 and 0.2-0.3 m, but a significantly lower volume of small macropores (30-100 mu m) at depths of 0-0.05, 0.05-0.1, 0.1-0.2 and 0.2-0.3 m. The volume of meso- (0.2-30 mu m) and micro-pores (< 0.2 mu m) at different depths under the two tillage practices were similar. Tillage-induced changes in soil bulk density and pore-size volumes affected the ability of soil to fulfil essential soil functions in relation to organic matter turnover. Soil pore-size distribution, especially small macropores greatly affected LLWR and there was a significant correlation between LLWR, which was calculated based on soil bulk density, and the proportion of small macropores. The proportion of small macropores were used to calculate LLWR instead of soil bulk density and the values for NT and MP soils ranged from 0.073 to 0.148 m(3) water/m(3) soil. Using the proportion of small macropores rather than bulk density in the calculation of LLWR resulted in more sensitive indications of SOC mineralization. Variation in the proportion of small macropores can help characterize the impacts of tillage practices on dynamics of LLWR and SOC sequestration. |
| 刊物名称： |
Journal of Agricultural Science |
| 参与作者： |
时秀焕，梁爱珍，张晓平，贾淑霞，范如芹，魏守才 |
吉公网安备22017302000214号
