Constant and diurnally-varying temperature regimes lead to different temperature sensitivities of soil organic carbon decomposition
Constant and diurnally-varying temperature regimes lead to different temperature sensitivities of soil organic carbon decomposition
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DOI：
10.1016/j.soilbio.2010.12.021
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发表时间：
2011-04
影响因子：
9.7
通讯作者：
B. Zhu;W. Cheng
中科院分区：
文献类型：
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作者：
B. Zhu;W. Cheng
通过4种温度处理下2种土壤类型的122 d培养试验，研究了土壤有机碳（SOC）分解的温度敏感性在恒定和日变化土壤温度下是否存在差异。在考虑了不同处理间底物可用性和质量的变化后，我们计算了q10值。恒温条件下的q10值持续且显著高于日变化条件下的q10值，特别是在分解后期（最高达30%）。这一结果表明，不同的温度制度是目前报道中关于有机碳分解温度敏感性存在争议的重要因素之一。
In a 122-day incubation experiment with two soil types under four temperature treatments, we examined whether the temperature sensitivity of soil organic carbon (SOC) decomposition differed between constant and diurnally-varying soil temperature regimes. We calculated the Q10values after accounting for changes in substrate availability and quality among treatments over time. The Q10values under constant temperature regime were consistently and significantly higher than those under diurnally-varying temperature regime, particularly in the later stages of decomposition (by up to 30%). This result indicated that different temperature regime was one of the important factors causing the current controversy about the temperature sensitivity of SOC decomposition in published reports.