Distribution and Relationships Regarding Fe, Al Oxides, and Microorganisms in Soil Microaggregates of Chinese Fir Plantation

Huang Rongzhen; Wang Jinping; Zhu Liqin; Huang Guomin; Shen Sijia; Li Yanyan; Wan Hongyu; Wu Haoze

doi:10.13961/j.cnki.stbctb.2022.01.009

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Distribution and Relationships Regarding Fe, Al Oxides, and Microorganisms in Soil Microaggregates of Chinese Fir Plantation

- Distribution and Relationships Regarding Fe, Al Oxides, and Microorganisms in Soil Microaggregates of Chinese Fir Plantation
- Bulletin of Soiland Water Conservation Vol. 42, Issue 1, Pages: 1-9(2022)
- 作者机构：
  
  南昌工程学院江西省退化生态系统修复与流域生态水文重点实验室,江西,南昌,330029
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.01.009
  CLC： S714
- Published：2022
- 稿件说明：
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Huang Rongzhen, Wang Jinping, Zhu Liqin, et al. Distribution and Relationships Regarding Fe, Al Oxides, and Microorganisms in Soil Microaggregates of Chinese Fir Plantation[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 1-9.
DOI：

Huang Rongzhen, Wang Jinping, Zhu Liqin, et al. Distribution and Relationships Regarding Fe, Al Oxides, and Microorganisms in Soil Microaggregates of Chinese Fir Plantation[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 1-9. DOI： 10.13961/j.cnki.stbctb.2022.01.009.

摘要

[目的

]

探究亚热带红壤区土壤微团聚体中铁铝氧化物与微生物的分布及其关系，为该区域土壤结构的改良提供理论依据。[方法

]

以亚热带红壤区典型林分杉木人工林为对象，研究不同粒级微团聚体胶结物中铁铝氧化物含量、结合态有机碳含量和微生物群落多样性在不同土层中的分布，并分析各形态铁铝氧化物含量与微生物群落多样性的关系。[结果

]

微团聚体中不同形态铁铝氧化物含量呈现：游离结晶态(Fe

，Al

)>>无定形(Fe

，Al

)>络合态(Fe

，Al

)。从总体上看，铁铝氧化物含量随微团聚体粒径的减少而逐渐增大，络合态铁(Fe

)和游离态铝(Al

)含量随土层深度的增加而逐渐降低，络合态铝(Al

)含量则是底层远高于表层。细菌、革兰氏阳性菌、革兰氏阴性菌是该林地的主要微生物，各类微生物PLFAs在土壤表层受粒径影响最大，且在粒径为50～200 μm的微团聚体中含量最高。微团聚体中微生物丰富度、香农指数和辛普森指数总体上均是表层土壤最高，粒径最小的微团聚体微生物丰富度、香农指数最高。冗余分析(RDA)显示，放线菌磷脂脂肪酸(PLFAs)含量、革兰氏阳性菌PLFAs含量、香农指数、辛普森指数与游离态铁(Fe

)含量呈极强负相关关系，细菌PLFAs含量与Al

含量、非晶型铝(Al

)含量呈出极强的正相关关系，真菌、细菌、革兰氏阴性菌和丛枝菌根真菌PLFAs含量与铁铝键结合态有机物〔Fe(Al)-SOC〕含量均呈负相关。[结论

]

杉木林红壤微团聚体中铁铝氧化物与微生物的分布受土层和粒级影响，不同种类的微生物与不同形态的铁铝氧化物和结合态有机碳的相关性强弱不同。

Abstract

[Objective] The distribution of Fe

Al oxides

and microbial community diversity in red soil microaggregates

and their relationships were studied in order to provide a theoretical basis for the improvement of subtropical red soil structure. [Methods] This study was conducted on a chinese fir plantation

which is the typical plant stand in the subtropical red soil region. The contents of Fe

Al oxides

bonded organic matter

and microbial communities of different soil microaggregate grain sizes in different soil layers (topsoil

0—10 cm; middle soil

10—20 cm; subsoil

20—30 cm) were measured. Their relationships were analyzed by the redundancy analysis method (RDA). [Results] Different forms of Fe

Al oxide contents in soil micro-aggregates were present in the following order: dithionite-citrate-bicarbonate-extractable oxides (Fed

Ald) >> acid ammonium oxalate-extractable oxides (Feo

Alo) > sodium pyrophosphate-extractable oxides (Fep

Alp). In general

Fe and Al oxide contents increased slowly with decreasing soil micro-aggregate grain sizes. The Fep and Ald contents decreased slowly with increasing soil depth

and Alp content in the subsoil was far greater than in the topsoil. The main microorganisms in the chinese fir plantation soil were bacteria

and gram-positive and negative bacteria. The effect of micro-aggregate grain size on microorganisms was greater in topsoil than in middle soil and subsoil. The phospholipid fatty acids (PLFAs) of microorganisms in soil micro-aggregates of 50—200 μm diameter were greater than in micro-aggregates of other diameters. The richness

Shannon index

and Simpson index of microorganisms were greatest in topsoil

and the richness and Shannon index of microorganisms were greatest in soil micro-aggregates with the lowest diameter. RDA revealed that antino bacteria PLFAs

gram-positive bacteria PLFAs

and microbial Shannon and Simpson indexes were highly significantly and negatively correlated with Fed. Bacteria PLFAs showed highly significant positive relationships with Ald and Alo contents. Fungus

bacteria

gram-negative bacteria

arbuscular mycorrhizal fungus PLFAs showed negative relationships with Fe-Al bonded organic carbon 〔Fe(Al)-SOC〕 content. [Conclusion] The distributions of Fe

Al oxides

and microbial community diversity in subtropical red soil micro-aggregates were affected by soil layers and micro-aggregate size. Different types of microorganisms were affected by different forms of Fe and Al oxides

and bonded organic carbon.

关键词

Keywords

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