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Abrupt rise in atmospheric CO2 overestimates community response in a model plant-soil system

机译：大气中二氧化碳的突然升高高估了植物-土壤模型系统中社区的反应

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摘要

Attempts to understand the ecological effect of increasing atmospheric CO2 concentration, [CO2], usually involve exposing today's ecosystems to expected future [CO2] levels(1,2). However, a major assumption of these approaches has not been tested that exposing ecosystems to a single- step increase in [ CO2] will yield similar responses to those of a gradual increase over several decades(3). We tested this assumption on a mycorrhizal fungal community over a period of six years. [ CO2] was either increased abruptly, as is typical of most [ CO2] experiments, or more gradually over 21 generations. The two approaches resulted in different structural and functional community responses to increased [ CO2]. Some fungi were sensitive to the carbon pulse of the abrupt [ CO2] treatment. This resulted in an immediate decline in fungal species richness and a significant change in mycorrhizal functioning. The magnitude of changes in fungal diversity and functioning in response to gradually increasing [ CO2] was smaller, and not significantly different to those with ambient [ CO2]. Our results suggest that studies may overestimate some community responses to increasing [ CO2] because biota may be sensitive to ecosystem changes that occur as a result of abrupt increases.
机译：试图了解增加大气中二氧化碳浓度[CO2]的生态效应，通常涉及将当今的生态系统暴露于预期的未来[CO2]水平（1,2）。但是，尚未验证这些方法的主要假设，即将生态系统暴露于[CO2]的单步增加将产生与几十年内逐渐增加的响应相似的响应（3）。我们在六年的菌根真菌群落上测试了该假设。 [CO2]突然增加，这是大多数[CO2]实验中的典型现象，或者在21代后逐渐增加。两种方法导致社区对[CO2]的增加产生不同的结构和功能响应。一些真菌对突然[CO2]处理的碳脉冲敏感。这导致真菌物种丰富度立即下降，菌根功能发生重大变化。响应[CO2]逐渐增加的真菌多样性和功能变化的幅度较小，与环境[CO2]的变化无明显差异。我们的结果表明，研究可能高估了某些社区对[CO2]增长的反应，因为生物区系可能对由于突然增加而引起的生态系统变化敏感。

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