Journal article
Rusty sink of rhizodeposits and associated keystone microbiomes
Soil biology & biochemistry, Vol.147, 107840
01/08/2020
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Abstract
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: <em>Paucimonas</em> (beta-Proteobacteria) being an r-strategist with rapid growth under soil without nutrient limitation (N treated) and <em>Steroidobacter </em>(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 <em>Acidimicrobiaceae</em> (Actinobacteria), <em>Cryptococcus</em> and <em>Cystofilobasidium</em> (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.
Details
- Title
- Rusty sink of rhizodeposits and associated keystone microbiomes
- Creators
- Peduruhewa H. Jeewani - Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, ChinaAnna Gunina - University of KasselLiang Tao - Chinese Academy of SciencesZhenke Zhu - Institute of Subtropical AgricultureYakov Kuzyakov - University of GöttingenLukas Van Zwieten - New South Wales Department of Primary IndustriesGeorg Guggenberger - Leibniz University HannoverCongcong Shen - Research Center for Eco-Environmental SciencesGuanghui Yu - Tianjin UniversityBhupinder Pal Singh - New South Wales Department of Primary IndustriesShaotong Pan - Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, ChinaYu Luo - Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, ChinaJianming Xu - Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, China
- Publication Details
- Soil biology & biochemistry, Vol.147, 107840
- Publisher
- Elsevier
- Number of pages
- 11
- Grant note
- 41671233; 41877038 / National Natural Science Foundation of China; National Natural Science Foundation of China (NSFC)
- Identifiers
- 991013054662202368
- Copyright
- © 2020 Elsevier Ltd. All rights reserved.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article