Global Convergence in the Temperature Sensitivity of Respiration at Ecosystem Level
Global Convergence in the Temperature Sensitivity of Respiration at Ecosystem Level
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DOI：
10.1126/science.1189587
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发表时间：
2010-08-13
期刊：
影响因子：
56.9
通讯作者：
Richardson, Andrew D.
中科院分区：
文献类型：
--
作者：
Mahecha, Miguel D.;Reichstein, Markus;Richardson, Andrew D.
陆地表面呼吸作用释放的二氧化碳（CO₂）是全球碳循环中的一个主要通量，与光合作用吸收CO₂的过程相反。理解呼吸作用过程对温度的敏感性对于量化气候 - 碳循环反馈至关重要。我们使用一种避免混淆效应的方法，估算了60个通量观测网（FLUXNET）站点陆地生态系统呼吸作用对气温的敏感性（Q₁₀）。与先前的研究结果相反，我们的结果表明Q₁₀与年平均温度无关，在不同生物群落之间没有差异，并且局限在1.4 ± 0.1左右的值。相比之下，光合作用和呼吸作用之间的紧密关系在不同站点之间差异很大。这些结果可能在一定程度上解释了为什么气候 - 碳循环反馈不如当前碳循环气候模型所表明的那样显著。
The respiratory release of carbon dioxide (CO2) from the land surface is a major flux in the global carbon cycle, antipodal to photosynthetic CO2 uptake. Understanding the sensitivity of respiratory processes to temperature is central for quantifying the climate-carbon cycle feedback. We approximated the sensitivity of terrestrial ecosystem respiration to air temperature (Q(10)) across 60 FLUXNET sites with the use of a methodology that circumvents confounding effects. Contrary to previous findings, our results suggest that Q(10) is independent of mean annual temperature, does not differ among biomes, and is confined to values around 1.4 +/- 0.1. The strong relation between photosynthesis and respiration, by contrast, is highly variable among sites. The results may partly explain a less pronounced climate-carbon cycle feedback than suggested by current carbon cycle climate models.