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首页> 外文期刊>Journal of soil & 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：模型实验室实验中生物炭与土壤pH，CEC和可交换碱性阳离子之间的相互关系

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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的土壤仅具有狭窄的特性，因此很难对生物炭对土壤的影响进行概括。在这项研究中，我们旨在确定可确定高温（700摄氏度）下产生的生物炭对土壤pH，阳离子交换容量（CEC）和可交换碱阳离子（Ca2 +，K +和Mg2 +）含量的性能的土壤特性。材料和方法将十种具有不同物理化学性质的不同土壤培养12个星期，采用四种生物炭施用率（0.5、2、4和8％w / w）。在培养的第7天和第84天测定土壤的pH值，CEC和可交换的碱性阳离子（Ca2 +，K +和Mg2 +）。结果与讨论我们的结果表明，最高生物炭施用率（8％）对改变土壤更有效。性能要比较低的生物炭速率低。在所有培养的土壤中施用8％的生物炭可显着提高pH值，增幅范围可达1.17 pH单位。生物炭引起的土壤CEC的增加和下降分别达到35.4％和7.9％，生物炭的施用率为8％。同样，生物炭诱导的可交换Ca2 +的增加高达38.6％，而生物炭的施用率为8％时则下降了11.4％。在起始可交换Ca2 +含量低于所添加生物炭的土壤中发现CEC和可交换Ca2 +含量增加，而在可交换Ca2 +含量高于生物炭的土壤中观察到下降。原始的pH值，CEC，可交换的Ca2 +和土壤质地是决定土壤pH，CEC和可交换的Ca2 +含量变化量的最关键因素。结论我们的发现清楚地表明，在一定范围内应用均匀的生物炭在相同的环境条件下土壤的变化对土壤特性产生了两个矛盾的影响，包括土壤的CEC和可交换的Ca2 +含量。因此，对生物炭和土壤特性的了解将大大改善生物炭施用效率的预测，以改善土壤特性。在重要的土壤特性中，土壤可交换的Ca2 +含量是控制生物炭引起的土壤CEC和可交换的Ca2 +含量变化方向的主要因素。通常，生物炭可引起土壤pH，CEC和可交换Ca2 +，K +和Mg2 +的变化，其变化的有效性和幅度与土壤的原始特性密切相关。

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  • 来源
    《Journal of soil & 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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  • 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;可交换的碱性阳离子（Ca2 +;K +;Mg2 +）;pH;

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