Microcosm studies of the role of land plants in elevating soil carbon dioxide and chemical weathering
作者： C. Baars , T. Hefin Jones , Dianne Edwards
DOI: 10.1029/2008GB003228
关键词: Chemistry 、 Carbon cycle 、 Carbon dioxide in Earth's atmosphere 、 Environmental chemistry 、 Soil carbon 、 Soil water 、 Botany 、 Carbonic acid 、 Carbon dioxide 、 Microcosm 、 Organic matter
摘要: A decrease in atmospheric carbon dioxide (CO2) concentration during the mid-Palaeozoic is postulated to have been partially consequence of evolution rooted land plants. Root development increased amount carbonic acid generated by root respiration within soils. This led chemical weathering silicates and subsequent formation carbonates, resulting lower CO2 concentrations. To test this assumption, analog (morphologically equivalent) plant species, ranging from those possessing no roots with complex rhizomatous rooting systems, were grown trays microcosms at ambient (360 ppm/0.37 mbar) highly elevated (3500 ppm/3.55 concentrations a controlled environment facility. Substrate significantly under CO2, Equisetum hyemale (L.). The latter result effects deeply plants, concentrations, or both. Plants simple systems addition dead organic matter as substrate for microorganisms did not enhance
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