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Temperature sensitivity of the turnover times of soil organic matter in forests

机译：森林土壤有机质周转时间的温度敏感性

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Soils represent the largest carbon pool in the terrestrial biosphere, and climate change might affect the main carbon fluxes associated with this pool. These fluxes are the production of aboveground litter and root litter, and decomposition of the soil organic matter (SOM) pool by soil microorganisms. Knowledge about the temperature sensitivity of the decomposition of different SOM fractions is crucial in order to understand how climate change might affect carbon storage in soils. In this study, the temperature sensitivity of the turnover times of three different SOM fractions (labile, intermediate, and stabilized) was investigated for I I forest sites along a temperature gradient. Carbon-14 isotope analyses of the SOM fractions combined with a model provided estimates of their turnover times. The turnover times of the labile SOM fraction were not correlated with mean annual soil temperature. Therefore it was not possible to estimate temperature sensitivity for the labile SOM fraction. Given considerable evidence elsewhere for significant temperature sensitivities of labile SOM, lack of temperature sensitivity here most likely indicates limitations of the applied methodology for the labile SOM fraction. The turnover times of the intermediate and the stabilized SOM fractions were both correlated with mean annual soil temperatures. The temperature sensitivity of the stabilized SOM fraction was at least equal to that of the intermediate SOM fraction and possibly more than twice as high. A correction for confounding effects of soil acidity and clay content on the temperature sensitivities of the, intermediate and stabilized SOM fractions was included in the analysis. The results as observed here for the three SOM fractions may have been influenced by (1) modeling assumptions for the estimation of SOM turnover times of leaf and needle longevities, constant annual carbon inputs, and steady-state SOM pools, (2) the occurrence of summer drought at some sites, (3) differences between sites in quality of the SOM fractions, or (4) the relatively small temperature range. Our results suggested that a VC increase in temperature could lead to decreases in turnover times of 4-11% and 8-16%, for the intermediate and stabilized SOM fractions, respectively.
机译：土壤是地球生物圈中最大的碳库，气候变化可能会影响与此库相关的主要碳通量。这些通量是地上凋落物和根凋落物的产生，以及土壤微生物对土壤有机质（SOM）库的分解。为了了解气候变化如何影响土壤中的碳储量，有关不同SOM馏分分解的温度敏感性的知识至关重要。在这项研究中，研究了沿温度梯度对I I森林站点三种不同SOM组分（不稳定，中间和稳定）的周转时间的温度敏感性。通过对SOM馏分的碳14同位素分析和模型相结合，可以估算其周转时间。不稳定的SOM组分的周转时间与年平均土壤温度无关。因此，不可能估计不稳定的SOM分数的温度敏感性。鉴于其他地方有大量证据表明不稳定的SOM具有明显的温度敏感性，此处缺乏温度敏感性很可能表明不稳定的SOM馏分的应用方法存在局限性。中间和稳定的SOM馏分的周转时间都与年平均土壤温度相关。稳定的SOM馏分的温度敏感性至少等于中间SOM馏分的温度敏感性，并且可能高两倍以上。分析中包括对土壤酸度和粘土含量对SOM馏分，中间和稳定SOM馏分的温度敏感性的混杂影响的校正。这里观察到的三个SOM馏分的结果可能受到（1）建模假设的影响，这些假设用于估算叶片和针叶寿命的SOM周转时间，恒定的年碳输入量和稳态SOM池，（2）发生一些地点的夏季干旱，（3）不同地点之间SOM分数的质量差异，或（4）相对较小的温度范围。我们的结果表明，对于中间和稳定的SOM馏分，温度VC的升高可能导致周转时间减少4-11％和8-16％。

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