Evaluation of the Influence of Individual Clay Minerals on Biochar Carbon Mineralization in Soils

文献类型： 外文期刊

第一作者： Zhang, Qingzhong

作者： Zhang, Qingzhong;Keitel, Claudia;Singh, Balwant

作者机构：

关键词： biochar; organic carbon; carbon mineralization; clay minerals

期刊名称：SOIL SYSTEMS （ 影响因子：3.5； ）

ISSN：

年卷期： 2019 年 3 卷 4 期

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收录情况： SCI

摘要： Although association between mineral and biochar carbon have been speculated in some studies, still there is no direct evidence for the influence of individual clay minerals on the mineralization of biochar carbon in soils. To address this, we conducted an incubation study using monomineralic soils constituted by separately mixing pure minerals, i.e., smectite, kaolinite, and goethite, with a sandy soil. Switch grass biochar (400 degrees C) was added to the artificial soils and samples were incubated for 90 days at 20 degrees C in the laboratory. The CO2-C mineralized from the control, and biochar amended soil was captured in NaOH traps and the proportion of C mineralized from biochar was determined using delta C-13 isotopic analysis. The clay minerals significantly decreased the cumulative total carbon mineralized during the incubation period, whereas biochar had no effect on this. The least amount of total C was mineralized in the presence of goethite and biochar amended soil, where only 0.6% of the native soil organic carbon (SOC) (compared to 4.14% in control) and 2.9% of the biochar-C was mineralized during the 90 days incubation period. Native SOC mineralization was significantly reduced in the presence of biochar and the three minerals. Goethite was most effective in stabilizing both biochar and the native soil organic carbon. The short-term data from this study demonstrate that biochar application in Fe oxide rich soils may be an effective strategy to sequester biochar carbon, as well as to stabilize native soil carbon.

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