Climate Warming and Soil Carbon in Tropical Forests: Insights from an Elevation Gradient in the Peruvian Andes.
Climate Warming and Soil Carbon in Tropical Forests: Insights from an Elevation Gradient in the Peruvian Andes.
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DOI：
10.1093/biosci/biv109
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发表时间：
2015-09-01
期刊：
影响因子：
10.1
通讯作者：
Meir P
中科院分区：
文献类型：
--
作者：
Nottingham AT;Whitaker J;Turner BL;Salinas N;Zimmermann M;Malhi Y;Meir P
热带森林土壤有机质分解的温度敏感性将影响未来的气候。对秘鲁安第斯山脉3.5公里海拔梯度的研究，包括短期迁移实验和对生物群对当地热和土壤条件的长期适应的检查，揭示了可能调节这种敏感性的几个因素。总体而言，这项工作表明，在没有水分限制的情况下，分解的温度敏感性受植物残留物(凋落物)的化学成分和先前存在的有机质的物理和化学成分的调节：在化学成分较复杂的凋落物或有机质中，以及在团聚体中较少被遮挡的有机质中，温度敏感性较高。此外，热带山地森林中SOM的温度敏感性可能比以前认识到的更大，这是因为“适应冷的”和氮素有限的微生物分解者的存在，以及未来与变暖相关的植物群落和微生物群落可能发生的变化。沿高程断面的研究，如本文所述，可以揭示调节土壤有机质温度敏感性的因素。它们还可以补充和指导现场土壤变暖实验，这将是理解在未来气候变化下植物生产力变化如何调节这种对温度的脆弱性所必需的。
The temperature sensitivity of soil organic matter (SOM) decomposition in tropical forests will influence future climate. Studies of a 3.5-kilometer elevation gradient in the Peruvian Andes, including short-term translocation experiments and the examination of the long-term adaptation of biota to local thermal and edaphic conditions, have revealed several factors that may regulate this sensitivity. Collectively this work suggests that, in the absence of a moisture constraint, the temperature sensitivity of decomposition is regulated by the chemical composition of plant debris (litter) and both the physical and chemical composition of preexisting SOM: higher temperature sensitivities are found in litter or SOM that is more chemically complex and in SOM that is less occluded within aggregates. In addition, the temperature sensitivity of SOM in tropical montane forests may be larger than previously recognized because of the presence of “cold-adapted” and nitrogen-limited microbial decomposers and the possible future alterations in plant and microbial communities associated with warming. Studies along elevation transects, such as those reviewed here, can reveal factors that will regulate the temperature sensitivity of SOM. They can also complement and guide in situ soil-warming experiments, which will be needed to understand how this vulnerability to temperature may be mediated by altered plant productivity under future climatic change.