Effects of Different Forms of Iron and Aluminum Oxides on Soil Organic Carbon Content Under Native Coniferous and Broadleaf Plantations in South Subtropical Region of China

Zhu Hao; Xiao Zhirou; Ming Angang; Teng Jinqian; Qin Lin

doi:10.13961/j.cnki.stbctb.20220824.003

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Effects of Different Forms of Iron and Aluminum Oxides on Soil Organic Carbon Content Under Native Coniferous and Broadleaf Plantations in South Subtropical Region of China

- Effects of Different Forms of Iron and Aluminum Oxides on Soil Organic Carbon Content Under Native Coniferous and Broadleaf Plantations in South Subtropical Region of China
- Bulletin of Soiland Water Conservation Vol. 42, Issue 5, Pages: 386-392(2022)
- 作者机构：
  
  1. 广西大学林学院, 广西森林生态与保育重点实验室,广西,南宁,530004
  2. 中国林业科学研究院热带林业试验中心, 广西凭祥,532600
  3. 广西友谊关森林生态系统定位观测研究站, 广西凭祥,532600
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20220824.003
  CLC： S714
- Published：2022
- 稿件说明：
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Zhu Hao, Xiao Zhirou, Ming Angang, et al. Effects of Different Forms of Iron and Aluminum Oxides on Soil Organic Carbon Content Under Native Coniferous and Broadleaf Plantations in South Subtropical Region of China[J]. Bulletin of Soiland Water Conservation, 2022, 42(5): 386-392.
DOI：

Zhu Hao, Xiao Zhirou, Ming Angang, et al. Effects of Different Forms of Iron and Aluminum Oxides on Soil Organic Carbon Content Under Native Coniferous and Broadleaf Plantations in South Subtropical Region of China[J]. Bulletin of Soiland Water Conservation, 2022, 42(5): 386-392. DOI： 10.13961/j.cnki.stbctb.20220824.003.

摘要

[目的

]

探究南亚热带地区乡土针阔树种人工林土壤不同形态铁铝氧化物对土壤有机碳含量的作用特征，为深入理解该地区乡土树种人工林土壤有机碳积累机理提供科学依据。[方法

]

以位于广西壮族自治区凭祥市的中国林业科学研究院林业试验中心的马尾松(Pinus massoniana)纯林、格木(Erythrophleum fordii)纯林和马尾松—格木混交林3个乡土针阔树种人工林为研究对象，应用电感耦合等离子体发射光谱仪以及重铬酸钾法分别测定各林分不同土层(0—20，20—40，40—60 cm)土壤铁铝氧化物含量和有机碳含量，采用方差分析法检验各观测指标在不同林分不同土层间的差异性，利用Pearson相关分析法探讨土壤不同形态铁铝氧化物与有机碳之间的关系。[结果

]

马尾松—格木混交林土壤有机碳含量显著高于马尾松林和格木林，且3个林分土壤有机碳含量均随土层深度增加而减少；3个人工林土壤中各形态铁铝氧化物含量总体表现为：游离态氧化铁(Fe

)＞游离态氧化铝(Al

)＞无定形氧化铁(Fe

)＞无定形氧化铝(Al

)＞络合态氧化铁(Fe

)＞络合态氧化铝(Al

)；土壤Fe

与土壤有机碳含量显著负相关(p＜0.05)，而土壤Fe

，Fe

和Al

与土壤有机碳含量呈显著正相关关系(p＜0.05)。[结论

]

南亚热带乡土针阔树种人工林土壤Fe

含量高，因而增强了土壤有机碳的矿化能力，Fe

，Fe

和Al

含量虽少，但有助于提升土壤有机碳的固持与稳定。

Abstract

[Objective] The effects of different forms of iron and aluminum oxides on soil organic carbon content in native coniferous and broadleaf plantations in south subtropical region of China were studied in order to provide a scientific basis for further understanding the soil organic carbon accumulation mechanism of native tree plantations in this region. [Methods] The study was conducted in three native coniferous and broadleaf planted forests including a pure Pinus massoniana coniferous plantation

a pure Erythrophleum fordii broadleaf plantation

and a mixed plantation of these species located at the Experimental Center of Tropical Forestry

the Chinese Academy of Forestry

at Pingxiang City

Guangxi Autonomous Region. ICP-OES and the potassium dichromate method were respectively used to measure the content of iron and aluminum oxides and soil organic carbon content in different soil layers (0—20

20—40

40—60 cm) under each plantation. Analysis of variance was used to determine differences in observed indicators in different soil layers and stands. Pearson correlation analysis was used to test the relationship between different forms of iron and aluminum oxides and organic carbon. [Results] The content of soil organic carbon in the mixed plantation of P. massoniana and E. fordii was significantly greater than in the pure P. massoniana plantation and the pure E. fordii plantation

and the content of soil organic carbon decreased with increasing soil depth in the three plantations. Fed (total free mineral Fe oxides) was the highest of all forms of iron and aluminum oxides in the studied stands

followed by Ald (total free mineral Al oxides)

Feo (non-crystalline mineral Fe oxides)

Alo (non-crystalline mineral Al oxides)

Fep (organic bounded mineral Fe oxides)

and Alp (organic bounded mineral Al oxides). Furthermore

Fed and soil organic carbon had a significant negative correlation (p＜0.05)

while Feo

Fep

and Alp were positively and significantly correlated with soil organic carbon content (p＜0.05). [Conclusion] Soil organic carbon mineralization was enhanced due to high levels of Fed under native coniferous and broadleaf plantations in south subtropical region of China. Although Feo

Fep

and Alp contents were low

they could increase soil organic carbon retention and stability.

关键词

Keywords

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