An evaluation of abiotic carbon sinks in deserts

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• 作者：William H. Schlesinger
• 刊名：Global Change Biology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：23
• 期：1
• 页码：25-27
• 全文大小：62K
• ISSN：1365-2486

文摘

Recent field studies have reported anomalous CO₂ uptake using eddy-covariance techniques in arid and semiarid ecosystems. The rates of CO₂ uptake are incompatible with changes in situ of organic carbon pools. Here, I examine several potential mechanisms of abiotic CO₂ uptake in arid and semiarid soils: atmospheric pressure pumping, carbonate dissolution, and percolation of soil water through the vadose zone. Each mechanism is deemed inadequate to explain the observations of the eddy-covariance systems, which must now be questioned for their accuracy in desert ecosystems.