土壤中铁锰结核微结构与组分研究进展
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中国科学院地理科学与资源研究所

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国家自然科学基金项目(41977004)、中国科学院青年创新促进会会员项目(2019052)和中国科学院地理科学与资源研究所秉维优秀青年人才项目(2017RC203)资助


Research Progress on the Microstructure and Constituents of Fe-Mn Nodules in Soil
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Institute of Geographic Sciences and Natural Resources Research, CAS

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Supported by the National Natural Science Foundation of China (No.41977004), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (No.2019052) and the Outstanding Young Talent Project of Institute of Geographic Sciences and Natural Resources Research, the Chinese Academy of Sciences (No.2017RC203)

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    摘要:

    铁锰结核是土壤演化过程中形成的一种特殊新生体,其内部同心圆环带构造可用于反演古气候条件和成土环境,其组分可为微生物代谢提供营养元素和能量,进而影响土壤中养分和重金属的转化、固定与释放。本文综述了近几十年来国内外学者对土壤中铁锰结核研究所取得的进展,包括铁锰结核形成机制、演变过程与影响因素,不同地区铁锰结核微结构与组分差异,以及铁锰结核对养分转化与重金属吸附的影响。未来需进一步研究不同成土阶段铁锰结核形成速率与环境阈值,构建不同成土环境中铁锰结核演化模型,阐明铁锰结核对土壤中养分和重金属的固释机理,以期更好地理解地表关键带土壤发生过程与元素生物地球化学循环,为定量评价变化环境下土壤质量和功能提供依据。

    Abstract:

    Ferromanganese concretions (or Fe-Mn nodules), as a specific type of soil neoformations, are formed during pedogenic processes. The structure of concentric rings in soil Fe-Mn nodules can be used to reconstruct paleoclimatic conditions and soil-forming environments. The constituents of soil Fe-Mn nodules can provide nutrients and energy for microbial metabolism that in turn affect the transformation, fixation and mobilization of soil nutrients and heavy metals. This article reviewed the research progresses on soil Fe-Mn nodules during the past several decades, including (i) the formation mechanism and process of Fe-Mn nodules and the associated influencing factors; (ii) differences in the microstructure and constituents of Fe-Mn nodules in different regions; and (iii) effects of Fe-Mn nodules on nutrient transformation and heavy metal sorption. Future research priorities include (a) study of the formation rates and environmental thresholds of Fe-Mn nodules during different stages of soil development; (b) establishment of the evolution models of Fe-Mn nodules in different soil-forming environments; and (c) elucidation of the mechanisms of stabilization and release of soil nutrients and heavy metals by Fe-Mn nodules. This will facilitate understanding of the pedogenic processes and elemental biogeochemical cycling in the Earth’s Critical Zone and provide a basis for quantitative evaluation of soil quality and function under changing environments.

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王 祎,黄来明.土壤中铁锰结核微结构与组分研究进展[J].土壤学报,DOI:10.11766/trxb202107130360,[待发表]
WANG Yi, HUANG Laiming. Research Progress on the Microstructure and Constituents of Fe-Mn Nodules in Soil[J]. Acta Pedologica Sinica, DOI:10.11766/trxb202107130360,[In Press]

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