Effects of substrate availability on the temperature sensitivity of soil organic matter decomposition
Effects of substrate availability on the temperature sensitivity of soil organic matter decomposition
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DOI：
10.1111/j.1365-2486.2008.01827.x
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发表时间：
2009-01-01
影响因子：
11.6
通讯作者：
Cheng, Weixin
中科院分区：
文献类型：
--
作者：
Gershenson, Alexander;Bader, Nicholas E.;Cheng, Weixin
土壤碳是全球碳循环的重要组成部分。了解环境变化与土壤呼吸速率之间的关系对于预测气候变化中土壤碳通量的变化至关重要。尽管土壤有机质分解的温度敏感性一直受到人们的关注，但影响这种温度敏感性的因素仍然存在争议。在这项研究中，我们研究了基质的有效性对土壤呼吸的温度敏感性在几种不同类型的土壤。我们发现，增加底物的可用性有一个显着的积极影响的温度敏感性，测量土壤Q（10）值，这种影响是成反比的原始底物的可用性。如果分解遵循Michaelis-Menten动力学，则可以解释该观察结果。在基质有效性较高的土壤中，简单Q（10）模型最适用。
Soil carbon is a major component in the global carbon cycle. Understanding the relationship between environmental changes and rates of soil respiration is critical for projecting changes in soil carbon fluxes in a changing climate. Although significant attention has been focused on the temperature sensitivity of soil organic matter decomposition, the factors that affect this temperature sensitivity are still debated. In this study, we examined the effects of substrate availability on the temperature sensitivity of soil respiration in several different kinds of soils. We found that increased substrate availability had a significant positive effect on temperature sensitivity, as measured by soil Q(10) values, and that this effect was inversely proportional to original substrate availability. This observation can be explained if decomposition follows Michaelis-Menten kinetics. The simple Q(10) model was most appropriate in soils with high substrate availability.