评价生物土壤结皮对钙镁硅酸盐溶解和二氧化碳固存的作用

IF 1.1 4区地球科学 Q4 ENVIRONMENTAL SCIENCES

Physical Geography Pub Date : 2021-05-04 DOI:10.1080/02723646.2021.1919379

R. Dorn

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引用次数: 1

摘要

摘要：在美国索诺兰沙漠和科罗拉多高原的研究地点，经过25年的监测，生物土壤结皮（BSCs）增强了钙硅酸盐斜长石和镁硅酸盐橄榄石的溶解。亚利桑那州有机管道和犹他州摩押研究地点首次测量到的斜长石生物风化增强（BEW）平均值分别为2.3±0.4和3.0±0.4；橄榄石在这些位置分别为4.9±0.8和3.9±0.3。与地衣、树根、白蚁，尤其是蚂蚁等其他生物制剂相比，这些BEW较低。如果BCSs的这些现代BEW反映了太古宙土壤结壳中BEW的大小，那么覆盖太古宙地球表面的大量BSC的存在将不会与地球早期大气中没有显著减少大气CO2的现有证据相矛盾。BCSs相对较低的BEW值表明，BSC对于高水平的大气二氧化碳来说不是一个有用的地球工程解决方案。

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Assessing biological soil crusts as agents of Ca–Mg silicate dissolution and CO2 sequestration

ABSTRACT Biological soil crusts (BSCs) monitored over a 25-year period enhance the dissolution of the Ca-silicate plagioclase and the Mg-silicate olivine at Sonoran Desert and Colorado Plateau, USA, study sites. This first measured biological enhancement of weathering (BEW) for plagioclase is a mean of 2.3±0.4 and 3.0±0.4 for the Organic Pipe, Arizona and Moab, Utah study sites; and it is 4.9±0.8 and 3.9±0.3 for olivine at these respective sites. These BEWs are low compared to other biological agents such as lichens, tree roots, termites and especially ants. If these modern BEW for BCSs reflect the magnitude of BEW in Archean soil crusts, then the presence of abundant BSCs covering an Archean Earth surface would not contradict available evidence for no substantial atmospheric CO2 decline in Earth’s early atmosphere. The relatively low BEW value for BCSs indicates that BSCs would not be a useful geoengineering solution to high levels of atmospheric carbon dioxide.

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来源期刊

Physical Geography 地学-地球科学综合

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： Physical Geography disseminates significant research in the environmental sciences, including research that integrates environmental processes and human activities. It publishes original papers devoted to research in climatology, geomorphology, hydrology, biogeography, soil science, human-environment interactions, and research methods in physical geography, and welcomes original contributions on topics at the intersection of two or more of these categories.