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首页> 外文期刊>Environmental Science & Technology >Biochar Carbon Stability in a Clayey Soil As a Function of Feedstock and Pyrolysis Temperature
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Biochar Carbon Stability in a Clayey Soil As a Function of Feedstock and Pyrolysis Temperature

机译：粘土土壤中生物炭碳稳定性随原料和热解温度的变化

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摘要

The stability of biochar carbon (C) is the major determinant of its value for long-term C sequestration in soil. A long-term (5 year) laboratory experiment was conducted under controlled conditions using 11 biochars made from five C3 biomass feedstocks (Eucalyptus saligna wood and leaves, papermill sludge, poultry litter, cow manure) at 400 and/or 550 ℃. The biochars were incubated in a vertisol containing organic C from a predominantly C4-vegetation source, and total CO_2-C and associated δ~(13)C were periodically measured. Between 0.596 and 8.9% of the biochar C was mineralized over 5 years. The C in manure-based biochars mineralized faster than that in plant-based biochars, and C in 400 ℃ biochars mineralized faster than that in corresponding 550 ℃ biochars. The estimated mean residence time (MRT) of C in biochars varied between 90 and 1600 years. These are conservative estimates because they represent MRT of relatively labile and intermediate-stability biochar C components. Furthermore, biochar C MRT is likely to be higher under field conditions of lower moisture, lower temperatures or nutrient availability constraints. Strong relationships of biochar C stability with the initial proportion of nonaromatic C and degree of aromatic C condensation in biochar support the use of these properties to predict biochar C stability in soil.
机译：生物炭碳（C）的稳定性是其长期固存在土壤中的价值的主要决定因素。在受控条件下，使用五种C3生物量原料（桉木和树叶，造纸厂的污泥，家禽垃圾，牛粪）制成的11种生物炭，在受控条件下进行了长期（5年）实验室实验。将生物炭在主要来自C4植被的含有有机C的藜芦醇中孵育，并定期测量总CO_2-C和相关的δ〜（13）C。在5年中矿化了0.596％至8.9％的生物碳。粪便型生物炭中的碳矿化速度快于植物型生物炭中的碳，400℃生物炭中的碳矿化速度快于相应的550℃生物炭中的碳矿化速度。 C在生物炭中的估计平均停留时间（MRT）在90到1600年之间变化。这些是保守的估计，因为它们代表了相对不稳定和中等稳定性的生物炭C成分的MRT。此外，在较低水分，较低温度或养分可利用性的田间条件下，生物炭C MRT可能更高。生物炭C稳定性与非芳香族C的初始比例和生物炭中芳族C缩合度之间的密切关系支持使用这些性质来预测土壤中生物炭C的稳定性。

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  • 来源
    《Environmental Science & Technology》 |2012年第21期|11770-11778|共9页
  • 作者

    Bhupinder Pal Singh; Annette L. Cowie; Ronald J. Smernik;

  • 作者单位

    NSW Department of Primary Industries, PO Box 100, Beecroft NSW 2119, Australia,Rural Climate Solutions, University of New England/NSW Department of Primary Industries, Armidale 2351, Australia;

    NSW Department of Primary Industries, PO Box 100, Beecroft NSW 2119, Australia,Rural Climate Solutions, University of New England/NSW Department of Primary Industries, Armidale 2351, Australia;

    School of Agriculture, Food & Wine and Waite Research Institute, The University of Adelaide, Waite Campus, Urrbrae, South Australia 5064, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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