Decomposition temperature sensitivity of isolated soil organic matter fractions
Decomposition temperature sensitivity of isolated soil organic matter fractions
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DOI：
10.1016/j.soilbio.2010.07.022
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发表时间：
2010-11-01
影响因子：
9.7
通讯作者：
Paul, Eldor A.
中科院分区：
文献类型：
--
作者：
Plante, Alain F.;Conant, Richard T.;Paul, Eldor A.
普遍的共识是，气候变暖将导致土壤有机质（5084）分解的加速，从而作为一个潜在的正反馈机制。然而，关于不稳定与不稳定SOM的相对温度敏感性的争论尚未完全解决。我们分离酸水解残留物，代表一个不稳定的池SOM和颗粒有机物（POM），代表一个不稳定的池SOM，并在不同的温度下孵育，以确定温度敏感性的分解。POM的短期孵育产生的结果与公开的实验一致（即，而酸水解残留物的培养则无此效应。对比结果说明了评估不稳定与稳定SOM分解的温度敏感性的困难，部分原因是无法定量分离不稳定与稳定SOM池，并且无法充分确定呼吸对温度的反应不会被增强稳定性或微生物抑制等过程所掩盖。/适应。为了更好地解释和预测大体积有机质分解的温度响应，有必要进一步研究孤立的有机质组分分解的温度敏感性。(C)2010爱思唯尔有限公司保留所有权利。
The general consensus is that a warming climate will result in the acceleration of soil organic matter (5084) decomposition, thus acting as a potential positive feedback mechanism. However, the debate over the relative temperature sensitivity of labile versus recalcitrant SOM has not been fully resolved. We isolated acid hydrolysis residues to represent a recalcitrant pool of SOM and particulate organic matter (POM) to represent a labile pool of SOM, and incubated each at different temperatures to determine temperature sensitivity of decomposition. Short-term incubations of POM generated results consistent with published experiments (i.e., greater proportion of C respired and lower Q(10) than whole soil), while incubations of acid hydrolysis residues did not. The contrasting results illustrate the difficulty in assessing temperature sensitivity of labile versus stable SOM decomposition, partly because of the inability to quantitatively isolate labile versus stable SOM pools and to be sufficiently certain that respiration responses to temperature are not masked by processes such as enhanced stabilization or microbial inhibition/adaptation. Further study on the temperature sensitivity of decomposition of isolated SOM fractions is necessary to better explain and predict temperature responses of bulk SOM decomposition. (C) 2010 Elsevier Ltd. All rights reserved.