Huitong Experimental Station of Forest Ecology, State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, PR China.
PLoS One. 2013;8(2):e54779. doi: 10.1371/journal.pone.0054779. Epub 2013 Feb 6.
Extensive studies have been conducted to evaluate the effect of external organic Carbon on native soil organic carbon (SOC) decomposition. However, the direction and extent of this effect reported by different authors is inconsistent.
The objective was to provide a synthesis of existing data that comprehensively and quantitatively evaluates how the soil chemical properties and incubation conditions interact with additional external organic C to affect the native SOC decomposition.
A meta-analysis was conducted on previously published empirical studies that examined the effect of the addition of external organic carbon on the native SOC decomposition through isotopic techniques.
The addition of external organic C, when averaged across all studies, enhanced the native SOC decomposition by 26.5%. The soil with higher SOC content and fine texture showed significantly higher priming effects, whereas the soil with higher total nitrogen content showed an opposite trend. The soils with higher C:N ratios had significantly stronger priming effects than those with low C:N ratios. The decomposition of native SOC was significantly enhanced more at early stage of incubation (<15d) than at the later stages (>15d). In addition, the incubation temperature and the addition rate of organic matter significantly influenced the native SOC decomposition in response to the addition of external organic C.
已经进行了广泛的研究来评估外部有机碳对本地土壤有机碳（SOC）分解的影响。然而，不同作者报道的这种影响的方向和程度并不一致。
旨在综合现有数据，全面、定量地评估土壤化学性质和培养条件如何与额外的外部有机碳相互作用，从而影响本地 SOC 分解。
对先前发表的通过同位素技术研究添加外部有机碳对本地 SOC 分解影响的实证研究进行了荟萃分析。
添加外部有机碳平均可使本地 SOC 分解增加 26.5%。SOC 含量较高且质地较细的土壤表现出明显更高的激发效应，而总氮含量较高的土壤则呈现相反的趋势。C:N 比值较高的土壤的激发效应明显强于 C:N 比值较低的土壤。与后期（>15d）相比，在培养的早期（<15d），本地 SOC 的分解明显增强。此外，培养温度和有机质的添加率显著影响了本地 SOC 对添加外部有机碳的分解反应。
