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首页> 外文期刊>The New Phytologist >The effects of 11 yr of CO_2 enrichment on roots in a Florida scrub-oak ecosystem
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The effects of 11 yr of CO_2 enrichment on roots in a Florida scrub-oak ecosystem

机译：11年CO_2富集对佛罗里达灌木栎生态系统中根系的影响

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摘要

Uncertainty surrounds belowground plant responses to rising atmospheric CO_2 because roots are difficult to measure, requiring frequent monitoring as a result of fine root dynamics and long-term monitoring as a result of sensitivity to resource availability. We report belowground plant responses of a scrub-oak ecosystem in Florida exposed to 11 yr of elevated atmospheric CO_2 using open-top chambers. We measured fine root production, turnover and biomass using minirhizotrons, coarse root biomass using ground-penetrating radar and total root biomass using soil cores. Total root biomass was greater in elevated than in ambient plots, and the absolute difference was larger than the difference aboveground. Fine root biomass fluctuated by more than a factor of two, with no unidirectional temporal trend, whereas leaf biomass accumulated monotonically. Strong increases in fine root biomass with elevated CO_2 occurred after fire and hurricane disturbance. Leaf biomass also exhibited stronger responses following hurricanes. Responses after fire and hurricanes suggest that disturbance promotes the growth responses of plants to elevated CO_2. Increased resource availability associated with disturbance (nutrients, water, space) may facilitate greater responsesof roots to elevated CO_2. The disappearance of responses in fine roots suggests limits on the capacity of root systems to respond to CO_2 enrichment.
机译：不确定性围绕地下植物对大气CO_2升高的响应，因为根系难以测量，由于根系动态良好，需要经常进行监测，而对资源可用性的敏感性则需要进行长期监测。我们报告了佛罗里达的灌木栎生态系统的地下植物响应，使用开放式室暴露于11年的大气CO_2升高。我们使用微型根际测量仪测量了细根的生产，周转和生物量，使用探地雷达测量了粗根生物量，并使用了土壤核心测量了总根生物量。高地上的总根生物量大于周围地块，绝对差大于地上差。细根生物量波动超过两倍，没有单向时间趋势，而叶片生物量单调积累。火和飓风扰动后，细根生物量随CO_2升高而强烈增加。飓风后，叶片生物量也表现出较强的响应。火和飓风后的响应表明，干扰促进了植物对CO_2升高的生长响应。与干扰（养分，水，空间）相关的资源可用性的增加可能促进根对CO_2升高的更大响应。细根中反应的消失提示根系对CO_2富集的反应能力受到限制。

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