Differences in SOM Decomposition and Temperature Sensitivity among Soil Aggregate Size Classes in a Temperate Grasslands
文献类型：SCI/SSCI论文
| 作者 | Wang Q.; Wang, D.; Wen, X. F.; Yu, G. R.; He, N. P.; Wang, R. F. |
| 发表日期 | 2015 |
| 关键词 | organic-matter decomposition arctic tundra soils carbon decomposition microbial biomass c sequestration climate-change land-use fractions respiration turnover |
| 英文摘要 | The principle of enzyme kinetics suggests that the temperature sensitivity (Q10) of soil organic matter (SOM) decomposition is inversely related to organic carbon (C) quality, i.e., the C quality-temperature (CQT) hypothesis. We tested this hypothesis by performing laboratory incubation experiments with bulk soil, macroaggregates (MA, 250-2000 mu m), microaggregates (MI, 53-250 mu m), and mineral fractions (MF, < 53 mu m) collected from an Inner Mongolian temperate grassland. The results showed that temperature and aggregate size significantly affected on SOM decomposition, with notable interactive effects (P < 0.0001). For 2 weeks, the decomposition rates of bulk soil and soil aggregates increased with increasing incubation temperature in the following order: MA > MF > bulk soil > MI(P < 0.05). The Q10 values were highest for MA, followed (in decreasing order) by bulk soil, MF, and MI. Similarly, the activation energies (Ea) for MA, bulk soil, MF, and MI were 48.47, 33.26, 27.01, and 23.18 KJ mol(-1), respectively. The observed significant negative correlations between Q10 and C quality index in bulk soil and soil aggregates (P < 0.05) suggested that the CQT hypothesis is applicable to soil aggregates. Cumulative C emission differed significantly among aggregate size classes (P < 0.0001), with the largest values occurring in MA (1101 mu g g(-1)), followed by MF (976 mu g g(-1)) and MI (879 mu g g(-1)). These findings suggest that feedback from SOM decomposition in response to changing temperature is closely associated withsoil aggregation and highlights the complex responses of ecosystem C budgets to future warming scenarios. |
| 出处 | Plos One |
| 卷 | 10 |
| 期 | 2 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1932-6203 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38900]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Wang Q.,Wang, D.,Wen, X. F.,et al. Differences in SOM Decomposition and Temperature Sensitivity among Soil Aggregate Size Classes in a Temperate Grasslands. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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