Assessing the accumulation efficiency of various microbial carbon components in soils of different minerals
文献类型：期刊论文
| 作者 | Cai Yue1,4; Ma Tian3,4 ; Wang Yiyun1,4; Jia Juan4; Jia Yufu4; Liang Chao2; Feng Xiaojuan1,4
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| 刊名 | Geoderma
 |
| 出版日期 | 2022-02 |
| 卷号 | 407页码:1-11 |
| 关键词 | Microbial carbon pump Amino sugar Metabolic quotient (qCO2) Clay content Iron (hydr)oxide |
| DOI | 10.1016/j.geoderma.2021.115562 |
| 英文摘要 | Heterotrophic soil microbes are increasingly recognized as a key mediator transforming labile organic carbon (OC) into relatively stable soil carbon (C) in the form of microbial necromass (dead cells) and extracellular compounds associated with minerals. However, the accumulation of microbial necromass relative to labile OC consumption and its regulating factors remain poorly understood, although it has vital implications for soil C sequestration and modeling. Here by mimicking microbial C accumulation in constructed model soils using fructose as the sole OC substrate, we present a benchmark comparison of microbial C accrual versus OC mineralization under declining substrate availability and mineralogy. By quantifying various microbial components including biomass (living cells; indicated by phospholipid fatty acids), necromass (indicated by amino sugars) and total microbial C (including biomass, necromass and extracellular compounds; estimated as the difference between added and residual substrate C minus respiration) in a simple soil system, we compare microbial metabolic quotient (qCO2; i.e., microbial respiration rate per unit of biomass), amino sugar accumulation efficiency (AAE; i.e., ratio of amino sugars to respiration) and microbial C accumulation efficiency (mCAE; i.e., ratio of total microbial C to total microbialC and respiration), and assess their regulating factors. We find that while clay (bentonite) promotes microbial respiration, it enhances the rate as well as efficiency of amino sugar accumulation without affecting qCO2 or mCAE. On the contrary, ferrihydrite increases qCO2 and decreases AAE but promotes labile OC preservation via inhibiting microbial growth in the alkaline model soil. Hence, amino sugar accrual is more efficient in clay-rich model soils while labile OC is less consumed in model soils containing iron (hydr)oxide. Furthermore, while mCAE was correlated with qCO2 in all but the model soil with 6% clay, AAE was correlated with qCO2 only in model soils with 12% clay when the mineral treatments were considered separately. Collectively, our findings suggest that mCAE and AAE heavily depend on mechanisms preserving microbial C components but not solely on the metabolic efficiency and is mediated by soil mineral content as well as composition. Parameters considering microbial C preservation such as mCAE or AAE warrant further study for modelling and managing the formation of microbial derived stable soil OC. |
| 语种 | 英语 |
| 源URL | [http://ir.yic.ac.cn/handle/133337/40050]  |
| 专题 | 中国科学院烟台海岸带研究所 个人在本单位外知识产出 |
| 通讯作者 | Feng Xiaojuan |
| 作者单位 | 1.University of Chinese Academy of Sciences, Beijing 100049, China 2.Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China 3.State Key Laboratory of Grassland and Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China 4.State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China |
| 推荐引用方式 GB/T 7714 | Cai Yue,Ma Tian,Wang Yiyun,et al. Assessing the accumulation efficiency of various microbial carbon components in soils of different minerals[J]. Geoderma,2022,407:1-11. |
| APA | Cai Yue.,Ma Tian.,Wang Yiyun.,Jia Juan.,Jia Yufu.,...&Feng Xiaojuan.(2022).Assessing the accumulation efficiency of various microbial carbon components in soils of different minerals.Geoderma,407,1-11. |
| MLA | Cai Yue,et al."Assessing the accumulation efficiency of various microbial carbon components in soils of different minerals".Geoderma 407(2022):1-11. |
入库方式： OAI收割
来源：烟台海岸带研究所
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