Variations in iron-bound organic carbon in soils along an altitude gradient and influencing factors in a subtropical mountain ecosystem of southern China

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Journal of Soils and Sediments Pub Date : 2024-07-30 DOI:10.1007/s11368-024-03873-z
Kai Xiong, Xinyu Jiang, Shaoqiang Huang, Jinshun Guan, Xiangbo Zou, Chuangting Chen, Tiancheng Zhou, Cao Kuang, Ji Ye, Shiqin Yu, Heng Jiang, Bin Huang
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Abstract

Purpose

The main factors governing iron-bound organic carbon (Fe-bound OC) formation under different environmental conditions have been less well identified. In this study, we investigated the distribution of Fe-bound OC and the influencing factors in soils of a typical subtropical mountain ecosystem.

Materials and methods

Soil samples at different altitudes (402–1653 m) and depths (0–20 cm, 20–40 cm, and 40–60 cm) in the Nanling Mountains of southern China were collected. The influence of soil property indicators and microbial diversity characteristics on the formation of Fe-bound OC was explored.

Results

The Fe-bound OC content in the soils ranged from 1.40 ± 1.32 g/kg to 15.09 ± 3.57 g/kg, accounting for an average of 23.49 ± 13.03% of the total organic carbon (TOC), and generally increased with altitude and exhibited significantly higher values at the soil depth of 0–20 cm, while its proportion to TOC (fFe-OC) gradually increased as soil depth increased. The more significant indicators in explaining the variation of Fe-bound OC include TOC, particulate organic carbon (POC), free iron oxides (Fed), amorphous iron oxides (Feo), complexed iron oxides (Fep), Feo/Fed, pH, Ca, sand and silt. Feo/Fed was strongly linearly correlated with Fe-bound OC, thus can be a good predictor of Fe-bound OC content. RDA analysis showed that Fe-bound OC/fFe-OC had a relatively closer correlation with bacterial phyla including Proteobacteria, Actinobacteriota, Chloroflexi and Firmicutes.

Conclusions

The attitude gradient and soil depth significantly influence the content of Fe-bound OC. The distribution of Fe-bound OC exhibited a certain correlation with both biotic and abiotic factors.

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中国南方亚热带山地生态系统土壤中铁结合有机碳沿海拔梯度的变化及其影响因素
目的 在不同环境条件下,影响铁结合有机碳(Fe-bound OC)形成的主要因素尚不十分明确。材料与方法在中国南方南岭山区采集了不同海拔(402-1653 m)、不同深度(0-20 cm、20-40 cm、40-60 cm)的土壤样品。结果土壤中铁结合有机碳的含量从1.40±1.32 g/kg到15.09±3.57 g/kg不等,平均占总有机碳(TOC)的23.49±13.03%,且随海拔的升高而升高,在0-20 cm深度的土壤中铁结合有机碳的含量显著升高,其占TOC的比例(fFe-OC)随土壤深度的增加而逐渐升高。解释铁结合有机碳变化的重要指标包括 TOC、颗粒有机碳 (POC)、游离铁氧化物 (Fed)、无定形铁氧化物 (Feo)、络合铁氧化物 (Fep)、Feo/Fed、pH 值、Ca、砂和淤泥。Feo/Fed 与铁结合 OC 呈强线性相关,因此可以很好地预测铁结合 OC 的含量。RDA 分析表明,Fe-bound OC/Fe-OC 与细菌门(包括变形菌、放线菌、绿霉菌和腐生菌)的相关性较近。结合铁的有机碳的分布与生物和非生物因素有一定的相关性。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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