Integrating plant litter quality, soil organic matter stabilization, and the carbon saturation concept
Integrating plant litter quality, soil organic matter stabilization, and the carbon saturation concept
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DOI：
10.1111/gcb.12982
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发表时间：
2015-09-01
影响因子：
11.6
通讯作者：
Six, Johan
中科院分区：
文献类型：
--
作者：
Castellano, Michael J.;Mueller, Kevin E.;Six, Johan
不稳定的，“高品质”，植物凋落物被假设为促进土壤有机质（SOM）的稳定矿物土壤组分的物理化学保护快速矿化。然而，凋落物质量对有机质稳定性的影响是不一致的。高品质的凋落物，其特征在于高N浓度，低C/N比，和低酚/木质素浓度，并不一贯稳定在SOM具有更高的效率比“低品质”的凋落物，其特征在于低N浓度，高C/N比，和高酚/木质素浓度。在这里，我们试图解决这些不一致的结果，通过开发一个新的概念模型，链接凋落物质量的土壤碳饱和度的概念。我们的模型建立在微生物效率-矩阵稳定框架（Cotrufo等人，2013）通过表明凋落物质量对SOM稳定的影响受到土壤C饱和度的调节，使得高质量的凋落物并不总是比低质量的凋落物更有效地稳定在SOM中。
Labile, 'high-quality', plant litters are hypothesized to promote soil organic matter (SOM) stabilization in mineral soil fractions that are physicochemically protected from rapid mineralization. However, the effect of litter quality on SOM stabilization is inconsistent. High-quality litters, characterized by high N concentrations, low C/N ratios, and low phenol/lignin concentrations, are not consistently stabilized in SOM with greater efficiency than 'low-quality' litters characterized by low N concentrations, high C/N ratios, and high phenol/lignin concentrations. Here, we attempt to resolve these inconsistent results by developing a new conceptual model that links litter quality to the soil C saturation concept. Our model builds on the Microbial Efficiency-Matrix Stabilization framework (Cotrufo et al., 2013) by suggesting the effect of litter quality on SOM stabilization is modulated by the extent of soil C saturation such that high-quality litters are not always stabilized in SOM with greater efficiency than low-quality litters.