The molar H:Corg ratio of biochar is a key factor in mitigating N2O emissions from soil
The molar H:Corg ratio of biochar is a key factor in mitigating N2O emissions from soil
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DOI：
10.1016/j.agee.2014.12.015
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发表时间：
2015-04-01
影响因子：
6.6
通讯作者：
van Zwieten, L.
中科院分区：
文献类型：
--
作者：
Cayuela, M. L.;Jeffery, S.;van Zwieten, L.
卡约拉等人（2014年）先前发表的一项关于生物炭对土壤一氧化二氮排放影响的荟萃分析发现，在土壤中施用生物炭后，一氧化二氮排放的“总平均值”降低了54±6%。在此，我们对该分析进行更新，纳入另外26篇文献，使总数达到56篇。更新后的荟萃分析证实，生物炭使土壤一氧化二氮排放降低了49±5%（平均值±95%置信区间）。重要的是，该荟萃分析有足够的数据来研究生物炭在田间条件下的影响，结果表明，与受控实验室研究（54±3%）相比，田间平均减排量（28±16%）在统计学上显著更低。一个关键发现是生物炭的摩尔H∶Corg比在决定一氧化二氮减排方面的重要性。摩尔H∶Corg比＜0.5的生物炭减排效果较差，为40±16%。结合先前发表的信息，我们的新结果表明，一个关键的减排机制与生物炭的聚合程度和芳香性有关。（C）2015爱思唯尔有限公司。保留所有权利。
A previously published meta-analysis of biochar impacts on soil N2O emissions by Cayuela et al. (2014) found a "grand mean" reduction in N2O emissions of 54 +/- 6% following biochar application to soil. Here we update this analysis to include 26 additional manuscripts bringing the total to 56 articles. The updated meta-analysis confirms that biochar reduces soil N2O emissions by 49 +/- 5% (mean +/- 95% confidence interval). Importantly, this meta-analysis has sufficient data to investigate the impact of biochar under field conditions, showing a statistically significant lower average reduction in the field (28 +/- 16%) compared to controlled laboratory studies (54 +/- 3%). A key finding is the importance of the molar H:Corg ratio of biochar in determining mitigation of N2O. Biochars with a molar H:Corg ratio 0.5 were less effective at 40 +/- 16%. Together with previously published information, our new results suggest that a key mitigation mechanism is linked to the degree of polymerization and aromaticity of biochar. (C) 2015 Elsevier B.V. All rights reserved.