土壤碳循环对变暖的长期敏感性
W Knorr1, I C Prentice, J I House
1Max Planck Institute for Biogeochemistry, PO Box 100164, D-07701 Jena, Germany. wknorr@bgc-jena.mpg.de
Nature
|January 22, 2005
概括
土壤碳分解对变暖的敏感性是不确定的. 一个新的模型显示,土壤有机碳 (SOC) 的快速损失解释了短期实验,而反抗性SOC可能会加速二氧化碳的长期释放.
科学领域:
- * 地球和环境科学 地球和环境科学
- * 气候科学 气候科学
- * 土壤科学 土壤科学
背景情况:
- *土壤有机碳 (SOC) 分解对变暖的敏感性是气候变化预测中的关键不确定性.
- *实验数据显示,随着土壤变暖,二氧化碳排放量增加,但一些研究表明不是这样.
- * 在实验中,SOC转换对温度的明显不敏感性可能是土壤碳异质性的工件.
研究的目的:
- * 调和有关土壤碳对变暖的反应的相互矛盾的发现.
- * 提出一个解释短期实验结果和长期气候反的模型.
- * 调查各种土壤碳池的不同温度灵敏度.
主要方法:
- *为土壤有机碳 (SOC) 开发一个简单的三池模型.
- *将SOC划分为具有不同的内在营业额率的组件.
- *使用新模型分析现有的土壤变暖实验数据.
主要成果:
- *三池模型协调了所有土壤变暖实验结果.
- *不稳定性SOC的快速耗尽解释了最初的CO2流量增加.
- *非性SOC的微不足道的反应解释了实验时间表上的明显不敏感性.
- * 有证据表明,非性SOC比性SOC更敏感于温度.
结论:
- * 短期土壤变暖实验无法捕捉SOC的全部长期温度灵敏度.
- * 土壤分解对气候的长期积极反可能被低估.
- * 未来的气候模型可能需要考虑强硬的土壤碳的更高的温度敏感性.
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