水耕人为土某些氧化还原形态特征的微结构和形成机理
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* 国家自然科学基金重点项目(批准号:49831004);中国科学院特别支持项目部分内容


MICRO-TRUCTURE AND FORMATION MECHANISM OF TYPICAL REDOXI-ORPHIC FEATURES OF HYDRAGRIC ANTHROSOLS
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    摘要:

    结合微形态观察和特征微区化学成分的电子能谱测定,对水耕人为土几种典型的氧化还原形态特征的结构进行了解析,并在此基础上提出了它们的形成机理。结果表明,根孔/裂隙淀积铁质胶膜形成于还原亚铁离子在根孔或裂隙面的氧化富集,该过程是Fe2+吸附于铝硅酸盐粘粒表面被氧化;根际铁质同心圆的形成涉及反应—转移—反馈的自组织过程,导致条带状富铁与贫铁区域的形成;淋失胶膜可分为铁锰淋失胶膜和粘粒淋失膜(淋余膜),二者在微结构和化学成分上有明显不同,后者不仅铁锰的淋失更甚,而且伴随铝硅酸盐粘粒的分解。

    Abstract:

    The micro-structure of several typical redoxi-morphic features of Hydragric Anthrosols were analyzed by combining micro-morphological observation and Electronic Energy Disperse Spectrometer (EDS) determination of micro-zone chemical composition. Their formation mechanisms were suggested. The results showed that, root pore/fissure coating was formed through the enrichment of oxidized ferrous iron (Fe2+)on the surface of root pore or fissure, and the oxidation took place on the surface of Al-silicate clay mineral. The formation of rizospheric concentric iron-ring involved a self-organized process of reaction-transfer-reaction feedback, which leaded to the formation of banded iron-rich and iron-poor zones. Bleached coating can be separated as iron (and/or manganese)-depleted and clay-depleted ones, which were obviously different from each other in micro-structure and chemical composition. The later not only had more loss of iron and manganese but also was accompanied by destruction of Al-silicate clay.

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张甘霖,龚子同.水耕人为土某些氧化还原形态特征的微结构和形成机理[J].土壤学报,2001,38(1):10-16. DOI:10.11766/trxb199910250102 Zhang Gan-lin, Gong Zi-tong. MICRO-TRUCTURE AND FORMATION MECHANISM OF TYPICAL REDOXI-ORPHIC FEATURES OF HYDRAGRIC ANTHROSOLS[J]. Acta Pedologica Sinica,2001,38(1):10-16.

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  • 收稿日期:1999-10-25
  • 最后修改日期:1999-12-20
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  • 在线发布日期: 2013-02-25
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