文章基本信息

标题：An inorganic CO2 diffusion and dissolution process explains negative CO2 fluxes in saline/alkaline soils
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作者：Jie Ma ; Zhong-Yuan Wang ; Bryan A. Stevenson 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2013
卷号：3
期号：1
DOI：10.1038/srep02025
语种：English
出版社：Springer Nature
摘要：An ‘anomalous’ negative flux, in which carbon dioxide (CO₂) enters rather than is released from the ground, was studied in a saline/alkaline soil. Soil sterilization disclosed an inorganic process of CO₂ dissolution into (during the night) and out of (during the day) the soil solution, driven by variation in soil temperature. Experimental and modeling analysis revealed that pH and soil moisture were the most important determinants of the magnitude of this inorganic CO₂ flux. In the extreme cases of air-dried saline/alkaline soils, this inorganic process was predominant. While the diurnal flux measured was zero sum, leaching of the dissolved inorganic carbon in the soil solution could potentially effect net carbon ecosystem exchange. This finding implies that an inorganic module should be incorporated when dealing with the CO₂ flux of saline/alkaline land. Neglecting this inorganic flux may induce erroneous or misleading conclusions in interpreting CO₂ fluxes of these ecosystems.