Rusty sink of rhizodeposits and associated keystone microbiomes
文献类型：期刊论文
| 作者 | Jeewani, Peduruhewa H.; Gunina, Anna; Tao, Liang; Zhu, Zhenke; Kuzyakov, Yakov; Van Zwieten, Lukas; Guggenberger, Georg; Shen, Congcong; Yu, Guanghui; Singh, Bhupinder Pal |
| 刊名 | SOIL BIOLOGY & BIOCHEMISTRY
 |
| 出版日期 | 2020-08 |
| 卷号 | 147页码:1-6 |
| 关键词 | C sequestration Rhizosphere priming effects SOC fractions alpha-FeOOH Fe-organic matter complexes Rhizosphere microbiome C-13 natural abundance |
| ISSN号 | 0038-0717 |
| 英文摘要 | Iron hydroxides serve as an efficient 'rusty sink' promoting the stabilization of rhizodeposits into soil organic carbon (SOC). Our work aimed to understand the physicochemical and microbial mechanisms promoting rhizodeposit (rhizo-C) stabilization as influenced by goethite (alpha-FeOOH) or nitrogen (N), using C-13 natural abundance methodologies and DNA sequencing, in the rhizosphere of maize (Zea mays L.). The addition of N fertilizer to soil increased the mineralization of both rhizo-C and SOC, while amendment with alpha-FeOOH decreased rhizo-C derived CO2 and lowered the rhizosphere priming effect by 0.57 and 0.74-fold, respectively, compared to the control soil. This decrease resulted from the co-precipitation of rhizo-C at the reactive alpha-FeOOH surfaces as Feorganic matter complexes (FeOM), which was 10-times greater than the co-precipitation on short-range ordered minerals. The highest portion of rhizo-C (67% of the total accumulated in soil) was protected within macmag-gregates (>2 mm). Carbon overlapped with alpha-FeOOH mainly in >2 mm aggregates, as shown by HRTEM-EDS imaging, suggesting that alpha-FeOOH associated rhizo-C stimulated aggregate formation. Random forest analysis confirmed that the stabilization of rhizo-C was controlled mainly by physiochemical binding within FeOM complexes and macroaggregates. Rhizo-C mineralization was regulated by the keystone microbiome: Paucimonas (beta-Proteobacteria) being an r-strategist with rapid growth under soil without nutrient limitation (N treated) and Steroidobacter (Actinobacteria) with branched filaments that can access C and nutrients under oligotrophic conditions (goethite enriched soil). Two-way orthogonal partial least squares analysis revealed that the rhizosphere priming effect was facilitated mainly by the same genera, most likely due to co-metabolism. The genera belonging to Acidimicrobiaceae (Actinobacteria), Cryptococcus and Cystofilobasidium (Basidiomycota) were positively correlated with the accumulation of rhizo-C in the >2 mm aggregate size, which might due to their high affinity towards alpha-FeOOH and contribution to the development of aggregation via filamentary structures that interact with microaggregates. We suggest that rhizodeposit stabilization in soil was balanced by microbial mineralization and abiotic associations with the rusty sink and organisms with branched filaments contributing to the development of aggregation. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45124]  |
| 专题 | 生态环境研究中心_土壤环境科学实验室 |
| 推荐引用方式 GB/T 7714 | Jeewani, Peduruhewa H.,Gunina, Anna,Tao, Liang,et al. Rusty sink of rhizodeposits and associated keystone microbiomes[J]. SOIL BIOLOGY & BIOCHEMISTRY,2020,147:1-6. |
| APA | Jeewani, Peduruhewa H..,Gunina, Anna.,Tao, Liang.,Zhu, Zhenke.,Kuzyakov, Yakov.,...&Xu, Jianming.(2020).Rusty sink of rhizodeposits and associated keystone microbiomes.SOIL BIOLOGY & BIOCHEMISTRY,147,1-6. |
| MLA | Jeewani, Peduruhewa H.,et al."Rusty sink of rhizodeposits and associated keystone microbiomes".SOIL BIOLOGY & BIOCHEMISTRY 147(2020):1-6. |
入库方式： OAI收割
来源：生态环境研究中心
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