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Field-aged biochar enhances soil organic carbon by increasing recalcitrant organic carbon fractions and making microbial communities more conducive to carbon sequestration
Agriculture, Ecosystems & Environment ( IF 6.6 ) Pub Date : 2022-09-12 , DOI: 10.1016/j.agee.2022.108177
Huijie Zheng, Deyan Liu, Xia Liao, Yuncai Miao, Ye Li, Junjie Li, Junji Yuan, Zengming Chen, Weixin Ding

Biochar has been widely proposed for carbon (C) sequestration, but its residual effects on soil organic C (SOC) accumulation and microbial characteristics are unknown. Herein, we investigated the content and components of organic C, and the abundance and community characteristics of microbes in a fluvo-aquic soil, after 4 years of biochar application at rates of 3, 6 and 12 t ha−1. Biochar application increased the contents of SOC and recalcitrant organic C fraction by 11.02–22.13 % and 18.41–32.31 % at 6 and 12 t ha−1, respectively, and the increased proportion for recalcitrant organic C fraction was greater than that for SOC. Among C functional groups, aryl C content was increased by 26.50–95.41 % at all rates, compared with 23.83–56.73 % for phenolic C at 6 and 12 t ha−1, and both increases were higher than that for SOC. Biochar application decreased bacterial abundance by 9.25–35.77 %, and altered bacterial community structure by increasing the relative abundance of Chloroflexi phylum, members of which have a low C mineralisation rate and strong C fixation ability. Dissolved organic C was the most critical factor of bacterial abundance and community structure. By contrast, 12 t ha−1 biochar application decreased fungal diversity by 12.45 %, and altered fungal community structure by increasing the relative abundances of Sordariomycetes and Tremellomycetes classes, both of which favoured SOC formation. The C/N ratio was the most important variable affecting fungal diversity and community structure. Overall, our results suggest that field-aged biochar, especially at a high-dose rate, accelerates organic C accumulation by increasing aryl and phenolic C functional groups of recalcitrant organic C fractions and shifting microbial communities more conducive to C sequestration in the fluvo-aquic soil.



中文翻译:

田间老化的生物炭通过增加顽固的有机碳分数和使微生物群落更有利于碳固存来增强土壤有机碳

生物炭已被广泛提出用于碳 (C) 封存,但其对土壤有机碳 (SOC) 积累和微生物特征的残留影响尚不清楚。在此,我们调查了以 3、6 和 12 t ha -1的速率施用 4 年生物炭后,潮土中有机碳的含量和成分,以及微生物的丰度和群落特征。生物炭的应用在 6 和 12 t ha -1下分别使 SOC 和顽固有机 C 组分的含量增加了 11.02-22.13 % 和 18.41-32.31 %,并且顽固有机 C 组分的增加比例大于 SOC。在 C 官能团中,芳基 C 含量在所有速率下均增加了 26.50-95.41%,而酚类 C 在 6 吨和 12 吨/公顷时增加了 23.83-56.73%-1,并且两者的增加都高于SOC。生物炭的应用使细菌丰度降低了 9.25-35.77 %,并通过增加 Chloroflexi 门的相对丰度来改变细菌群落结构,Chloroflexi 门的成员具有较低的 C 矿化率和较强的 C 固定能力。溶解的有机碳是影响细菌丰度和群落结构的最关键因素。相比之下,12 t ha -1生物炭的应用降低了 12.45% 的真菌多样性,并通过增加 Sordariomycetes 和 Tremellomycetes 类的相对丰度来改变真菌群落结构,这两者都有利于 SOC 的形成。C/N比是影响真菌多样性和群落结构的最重要变量。总体而言,我们的研究结果表明,现场老化的生物炭,特别是在高剂量率下,通过增加顽固有机 C 馏分的芳基和酚 C 官能团和改变微生物群落更有利于 C 封存来加速有机 C 积累。土壤。

更新日期:2022-09-12
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