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风化碳汇概念被提出至今已有18年(Berner,1992).而今,我们可以用最新的数据对其地质含义进行重新评估.近来,Ryskov等人以碳同位素的分析数据为基础认为:在过去5000年干旱时期的成土过程中,俄罗斯的土壤以土壤碳酸盐的形式将大气中的CO2固定下来,其中黑钙土的固碳速率为2.2kgCm-2a-1、深栗钙土为1.13kgCm-2a-1、浅栗钙土为0.86kgCm-2a-1.然而,他们对数据的解释却是间接而缺乏说服力的,因此,其观点很可能误导读者.Dart等人则持有相反的观点,他们的研究表明,澳大利亚风化层碳酸盐形成并没有吸收任何额外的CO2,而仅是在库与库之间进行简单迁移的结果.本文从以下两个问题对上述观点及其解释进行评述:(1)土壤碳酸盐的成因:硅酸盐风化和碳酸盐风化的比较;(2)用碳同位素示踪土壤碳酸盐来源存在的问题.得出的结论是:土壤碳酸盐可能根本不是一个重要的大气CO2汇,也即是说,碳酸盐风化成因的土壤碳酸盐没有吸收任何额外的CO2;另一方面,由于硅酸盐风化过程相当缓慢,其形成的土壤碳酸盐在短时间尺度内对大气CO2汇的能力很弱.
The concept of weathered carbon sinks has been proposed for 18 years so far (Berner, 1992). Today, we can re-evaluate the geological implications with the most up-to-date data. Recently, Ryskov and others, based on the analysis of carbon isotope data, In the process of soil formation during the 5000-year drought period, the soil in Russia was stabilized by carbon dioxide in the atmosphere, in which the carbon sequestration rate of chernozem was 2.2kgCm-2a-1, that of deep-chestnut soil was 1.13 kgCm-2a-1, and 0.86 kgCm-2a-1 in the shallow chestnut soil. However, their interpretation of the data is indirect and not convincing, so its view is likely to mislead the reader. Dart et al. From their point of view that their study shows that formation of carbonate from the weathering beds in Australia does not absorb any additional CO2 and is simply the result of a simple migration between the reservoirs and the reservoirs.This paper analyzes these points and their explanations from the following two questions (1) Comparison of silicate weathering with carbonate weathering; (2) Carbon isotope tracing of problems with soil carbonate sources led to the conclusion that soil carbon Acid salts may not be an important atmospheric CO2 sink at all, that is Said that the carbonate weathering carbonate did not absorb any additional CO2; on the other hand, the silicate weathering process was rather sluggish and the ability of the formed carbonate to sink CO2 to the atmosphere over a short period of time Very weak.