Reconciling differences in predictions of temperature response of soil organic matter
Reconciling differences in predictions of temperature response of soil organic matter
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DOI：
10.1016/s0038-0717(01)00156-0
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发表时间：
2002-01-01
影响因子：
9.7
通讯作者：
Bosatta, E
中科院分区：
文献类型：
--
作者：
Ågren, GI;Bosatta, E
长期以来，人们一直认为全球变暖会导致土壤呼吸增加，从而减少土壤碳储存。这一假设是基于对凋落物和土壤有机质孵化的短期研究。然而，最近的一些研究似乎表明土壤有机质对温度的敏感性不如之前想象的那么高。在本文中，我们将使用连续质量理论来证明土壤有机质分解的温度依赖性取决于研究的是自然温度下的土壤还是受到自然温度扰动的土壤。与根据自然温度下的土壤估算土壤有机质的周转时间相比，根据不同温度的典型培养实验估算土壤有机质的周转时间对温度变化更为敏感，因为周转率随自然土壤温度的变化与给定土壤周转率的温度响应不同。这调和了文献中一些看似不相容的结果。 (C) 2002 Elsevier Science Ltd. 保留所有权利。
Global warming has long been assumed to lead to an increase in soil respiration and, hence, decreasing soil carbon stores. This assumption has been based on short-term studies of litter and soil organic matter incubations. However, some recent studies seem to indicate that soil organic matter is less temperature sensitive than previously thought. We will in this paper use the continuous-quality theory to show that the temperature dependence of decomposition of soil organic matter depends on whether one studies soils at their native temperatures or soils that have been perturbed from their native temperatures. Turnover times of soil organic matter are more sensitive to temperature changes when they are estimated from typical incubation experiments with different temperatures than when they are estimated from soils at their native temperatures because the variation in turnover rate with native soil temperature is not the same as the temperature response of turnover rate of a given soil. This reconciles some seemingly incompatible results in the literature. (C) 2002 Elsevier Science Ltd. All rights reserved.