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首页> 外文期刊>Journal of soils & sediments >Mutual relationships of biochar and soil pH, CEC, and exchangeable base cations in a model laboratory experiment
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Mutual relationships of biochar and soil pH, CEC, and exchangeable base cations in a model laboratory experiment

机译：模型实验室实验中Biochar和土壤pH，CEC和可交换基地阳离子的相互关系

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摘要

Purpose The majority of biochar studies use soils with only a narrow range of properties making generalizations about the effects of biochar on soils difficult. In this study, we aimed to identify soil properties that determine the performance of biochar produced at high temperature (700 degrees C) on soil pH, cation exchange capacity (CEC), and exchangeable base cation (Ca2+, K+, and Mg2+) content across a wide range of soil physicochemical properties.Materials and methods Ten distinct soils with varying physicochemical properties were incubated for 12 weeks with four rates of biochar application (0.5, 2, 4, and 8% w/w). Soil pH, CEC, and exchangeable base cations (Ca2+, K+, and Mg2+) were determined on the 7th and 84th day of incubation.Results and discussion Our results indicate that the highest biochar application rate (8%) was more effective at altering soil properties than lower biochar rates. Application of 8% biochar increased pH significantly in all incubated soils, with the increment ranging up to 1.17 pH unit. Biochar induced both an increment and a decline in soil CEC ranging up to 35.4 and 7.9%, respectively, at a biochar application rate of 8%. Similarly, biochar induced increments in exchangeable Ca2+ up to 38.6% and declines up to 11.4%, at an 8% biochar application rate. The increment in CEC and exchangeable Ca2+ content was found in soils with lower starting exchangeable Ca2+ contents than the biochar added, while decreases were observed in soils with higher exchangeable Ca2+ contents than the biochar. The original pH, CEC, exchangeable Ca2+, and texture of the soils represented the most crucial factors for determining the amount of change in soil pH, CEC, and exchangeable Ca2+ content.Conclusions Our findings clearly demonstrate that application of a uniform biochar to a range of soils under equivalent environmental conditions induced two contradicting effects on soil properties including soil CEC and exchangeable Ca2+ content. Therefore, knowledge of both biochar and soil properties will substantially improve prediction of biochar application efficiency to improve soil properties. Among important soil properties, soil exchangeable Ca2+ content is the primary factor controlling the direction of biochar-induced change in soil CEC and exchangeable Ca2+ content. Generally, biochar can induce changes in soil pH, CEC, and exchangeable Ca2+, K+, and Mg2+ with the effectiveness and magnitude of change closely related to the soil's original properties.
机译：目的，大多数生物炭研究使用土壤，只有狭窄的特性范围的特性，使得生物炭对土壤困难的概括。在这项研究中，我们旨在识别土壤性质，以确定在土壤pH，阳离子交换能力（CEC）和可交换的基础阳离子（CA2 +，K +和Mg2 +）内容上产生高温（700℃）的生物炭的性能各种土壤理化学特性。材料和方法具有不同物理化学性质的十种不同的土壤，用四个生物炭涂布（0.5,2,4和8％w / w）孵育12周。在孵化的第7和第84天确定土壤pH，CEC和可交换的基阳离子（CA2 +，K +和MG2 +）。结果和讨论我们的结果表明，最高的生物炭申请率（8％）在改变土壤时更有效属性比较低的Biochar率。在所有孵化的土壤中，在所有孵化的土壤中施用8％的生物炭增加，增量高达1.17 pH单位。生物炭均分别诱导土壤CEC的增量和下降，分别以8％的生物炭申请率分别为35.4％和7.9％。类似地，Biochar诱导更换的CA2 +的增量+高达38.6％，下降至8％的生物炭申请率。 CEC中的增量和可交换的CA2 +含量在具有较低的可交换CA2 +含量的土壤中发现比添加的生物炭，而在具有比Biochar更高的可交换CA2 +含量的土壤中观察到降低。土壤的原始pH，CEC，可交换CA2 +和纹理代表了确定土壤pH，CEC和可交换CA2 +含量的变化量的最重要因素。结论我们的研究结果清楚地表明将统一的生物炭施加到范围内等同环境条件下的土壤诱导了对土壤性质的两种矛盾作用，包括土壤CEC和可交换的CA2 +含量。因此，对生物炭和土壤性质的知识将大大提高生物炭应用效率的预测，以改善土壤性质。在重要的土壤性质中，土壤可交换CA2 +含量是控制土壤CEC和可交换CA2 +含量的生物炭诱导的变化方向的主要因素。通常，Biochar可以诱导土壤pH，CEC和交换性Ca2 +，K +，Mg2 +的变化，其变化与土壤的原始性质密切相关。

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  • 来源
    《Journal of soils & sediments》 |2019年第5期|2405-2416|共12页
  • 作者

    Hailegnaw Niguss Solomon; Mercl Filip; Pracke Katerina; Szakova Jirina; Tlustos Pavel;

  • 作者单位

    Czech Univ Life Sci Prague Fac Agrobiol Food & Nat Resources Dept Agroenvironm Chem & Plant Nutr Kamycka 129 Prague 16500 6 Suchdol Czech Republic;

    Czech Univ Life Sci Prague Fac Agrobiol Food & Nat Resources Dept Agroenvironm Chem & Plant Nutr Kamycka 129 Prague 16500 6 Suchdol Czech Republic;

    Czech Univ Life Sci Prague Fac Agrobiol Food & Nat Resources Dept Agroenvironm Chem & Plant Nutr Kamycka 129 Prague 16500 6 Suchdol Czech Republic;

    Czech Univ Life Sci Prague Fac Agrobiol Food & Nat Resources Dept Agroenvironm Chem & Plant Nutr Kamycka 129 Prague 16500 6 Suchdol Czech Republic;

    Czech Univ Life Sci Prague Fac Agrobiol Food & Nat Resources Dept Agroenvironm Chem & Plant Nutr Kamycka 129 Prague 16500 6 Suchdol Czech Republic;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Biochar; CEC; Exchangeable base cations (Ca2+, K+, Mg2+); pH;

    机译：生物炭;CEC;可交换基阳离子（CA2 +;K +;MG2 +）;pH;

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