Biochar alters microbial community and carbon sequestration potential across different soil pH
Biochar alters microbial community and carbon sequestration potential across different soil pH
复制标题
生物炭改变不同土壤 pH 值下的微生物群落和固碳潜力
DOI：
10.1016/j.scitotenv.2017.11.337
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发表时间：
2018-05-01
影响因子：
9.8
通讯作者：
Zhu, Lizhong
中科院分区：
文献类型：
--
作者：
Sheng, Yaqi;Zhu, Lizhong
生物炭的土壤应用已被提议用于土壤固碳和减缓全球变暖。虽然最近的研究表明，土壤pH值是影响土壤微生物群落和生物炭稳定性的主要因素，但关于不同土壤pH值下的微生物群落以及随后的CO2排放的信息很少。为研究不同pH水平下生物质炭对土壤微生物的响应和CO2排放，在pH为5.19的铁红壤和pH为7.81的黑土中，进行了4种生物质炭添加量（0.5%，1.0%，2.0%，5.0%）下的CO2排放、生物质炭降解和微生物群落的比较培养研究。在酸性铁红壤中，生物质炭的降解导致了较高的CO2排放量，而在碱性黑土中，SOC的负启动效应（PE）导致了CO2排放总量的降低。土壤中细菌多样性的增加，特别是拟杆菌、芽单胞菌等共养细菌的富集和酸杆菌等寡养细菌的减少，是导致铁红壤CO2排放量增加和SOC初始正PE的主要原因，而生物炭并未改变黑土中大多数细菌在门水平上的相对丰度。其他细菌类群（即放线菌，Anaerolineae）已知降解芳香族化合物的相对丰度也在这两种土壤中升高。结果表明，添加生物炭后，土壤pH值通过增加有机碳的生物有效性和共生细菌的数量而成为影响CO2排放的主导因素。生物炭吸附降低了土壤有机碳的生物有效性，导致黑土中贫营养细菌的丰度增加，从而降低了CO2的排放。(c)2017由Elsevier B.V.出版
Biochar application to soil has been proposed for soil carbon sequestration and global warming mitigation. While recent studies have demonstrated that soil pH was a main factor affecting soil microbial community and stability of biochar, little information is available for the microbiome across different soil pH and the subsequently CO2 emission. To investigate soil microbial response and CO2 emission of biochar across different pH levels, comparative incubation studies on CO2 emission, degradation of biochar, and microbial communities in a ferralsol (pH 5.19) and a phaeozems (pH 7.81) with 4 biochar addition rates (0.5%, 1.0%, 2.0%, 5.0%) were conducted. Biochar induced higher CO2 emission in acidic ferralsol, largely due to the higher biochar degradation, while the more drastic negative priming effect (PE) of SOC resulted in decreased total CO2 emission in alkaline phaeozems. The higher bacteria diversity, especially the enrichment of copiotrophic bacteria such as Bacteroidetes, Gemmatimonadetes, and decrease of oligotrophic bacteria such as Acidobacteria, were responsible for the increased CO2 emission and initial positive PE of SOC in ferralsol, whereas biochar did not change the relative abundances of most bacteria at phylum level in phaeozems. The relative abundances of other bacterial taxa (i.e. Actinobacteria, Anaerolineae) known to degrade aromatic compounds were also elevated in both soils. Soil pH was considered to be the dominant factor to affect CO2 emission by increasing the bioavailability of organic carbon and abundance of copiotrophic bacteria after biochar addition in ferralsol. However, the decreased bioavailability of SOC via adsorption of biochar resulted in higher abundance of oligotrophic bacteria in phaeozems, leading to the decrease in CO2 emission. (c) 2017 Published by Elsevier B.V.