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Weathering of carbonate rocks by biological soil crusts in karst areas
Ye Chen;  Bin Lian;  Zuoying Yin;  Yuan Tang
2014
发表期刊Journal of Earth Science
卷号25期号:4页码:662-667
摘要

The weathering of carbonate rocks by biological soil crusts (BSC) in karst areas is very common. It is helpful to understand the weathering mechanisms and processes for avoiding karst rock-desertification. The weathering of carbonate rocks by BSC in karst areas, namely the expansion, contraction and curl resulting from environmental wetting-drying cycles, was investigated and analyzed in this paper. The bulk density, area and thickness of BSC were determined and the weathering amount of limestone and dolomite per unit area of BSC was calculated as 3 700 and 3 400 g·m-2; the amount of biomass on the surface of limestone and dolomite was calculated as 1 146 and 1 301 g·m-2, respectively. Such an increased weathering amount was not only the result of chemical and physical weathering of BSC on carbonate rocks, but also the attachment and cementation of BSC to clay particles, dust-fall, sand particles, solid particles brought by strong air currents, wind and other factors in the surrounding environment, which may also be related to the special environment and the special time period. Based on the results obtained, a weathering mode of BSC is studied, and the mechanisms of weathering by BSC are discussed. In conclusion, we suggest that the mechanical force exerted by the expansion and constriction of gelatinous and mucilaginous substances through wetting and drying of BSC play a significant role in the physical weathering process of the carbonate substrates.

关键词Biological Soil Crust dolomite limestone weathering Amount biomass
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/9289
专题环境地球化学国家重点实验室
作者单位1.Key Laboratory of Karst Environment and Geological Hazard Prevention, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550003, China
2.Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Microbiology, College of Life Science, Nanjing Normal University, Nanjing 210023, China
3.Puding Karst Ecosystem Research Station, State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
推荐引用方式
GB/T 7714
Ye Chen;Bin Lian;Zuoying Yin;Yuan Tang. Weathering of carbonate rocks by biological soil crusts in karst areas[J]. Journal of Earth Science,2014,25(4):662-667.
APA Ye Chen;Bin Lian;Zuoying Yin;Yuan Tang.(2014).Weathering of carbonate rocks by biological soil crusts in karst areas.Journal of Earth Science,25(4),662-667.
MLA Ye Chen;Bin Lian;Zuoying Yin;Yuan Tang."Weathering of carbonate rocks by biological soil crusts in karst areas".Journal of Earth Science 25.4(2014):662-667.
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