Effects of reclamation of paddy fields on soil iron-bound organic carbon in Minjiang River estuarine wetland

LIU Xuyang; WANG Chun; GUO Pingping; FANG Yunying; SHEN Lidong; HU Shiwen; HEI Jie; WANG Yafei; XU Jiayi; WANG Weiqi

doi:10.16562/j.cnki.0256-1492.2023031701

2024 Vol. 44, No. 1

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Article navigation > Marine Geology & Quaternary Geology > 2024 > 44(1): 44-54

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LIU Xuyang, WANG Chun, GUO Pingping, FANG Yunying, SHEN Lidong, HU Shiwen, HEI Jie, WANG Yafei, XU Jiayi, WANG Weiqi. Effects of reclamation of paddy fields on soil iron-bound organic carbon in Minjiang River estuarine wetland[J]. Marine Geology & Quaternary Geology, 2024, 44(1): 44-54. doi: 10.16562/j.cnki.0256-1492.2023031701

Citation:

LIU Xuyang, WANG Chun, GUO Pingping, FANG Yunying, SHEN Lidong, HU Shiwen, HEI Jie, WANG Yafei, XU Jiayi, WANG Weiqi. Effects of reclamation of paddy fields on soil iron-bound organic carbon in Minjiang River estuarine wetland[J]. Marine Geology & Quaternary Geology, 2024, 44(1): 44-54. doi: 10.16562/j.cnki.0256-1492.2023031701

Effects of reclamation of paddy fields on soil iron-bound organic carbon in Minjiang River estuarine wetland

1.
Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education, Fujian Normal University, Fuzhou 350117, China
2.
Wetland Ecosystem Research Station of Fujian Minjiang Estuary (National Forestry and Grassland Administration), Fuzhou 350215, China
3.
Fujian Minjiang River Estuary Wetland National Nature Reserve Administrative Office, Fuzhou 350200, China
4.
Australian Rivers Institute and School of Environment and Science, Griffith University, Nathan Campus, Queensland 4111, Australia
5.
School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
6.
National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangzhou 510650, China

More Information

Corresponding author: WANG Weiqi, wangweiqi15@163.com

Received Date: 17 March 2023

Revised Date: 11 April 2023

Publish Date: 28 February 2024

Abstract

Abstract

Iron oxide bound organic carbon is the main pathway for long-term stability of organic carbon. However, study of its mechanism remains weak. To understand the impact of estuarine wetland reclamation of paddy field on soil iron-carbon binding characteristics, we measured the soil iron-bound organic carbon (Fe-OC) and its related indicators in the natural reed (Phragmite australis) wetland and paddy field reclamation in Minjiang River estuary, Fujian Province. Results show that the wetland reclamation significantly affected the soil oxidation and reduction condition, and the redox process significantly affected the transformation of iron (Fe) phase in soil. After the wetland reclamation, the content of bivalent iron [Fe(Ⅱ)], trivalent iron [Fe(Ⅲ)], active total iron (HCl-Fe_t), and Fe(Ⅲ)/Fe(Ⅱ) in the soil significantly decreased by 24.68%, 52.56%, 51.45%, and 35.68%, respectively (P<0.05). The content of free Fe oxide (Fe_d) and amorphous iron (Fe_o) in the soil significantly decreased by 21.64% and 29.24%, respectively (P<0.05), but the content of complex iron (Fe_p) increased. In addition, the wetland reclamation significantly affected the soil carbon retention, and the content of Fe-OC and soil organic carbon (SOC) in the soil significantly decreased by 39.03% and 18.42% after the reclamation (P<0.05). In both reed wetland and paddy field, soil Fe-OC was combined dominantly through adsorption. The contribution rate of paddy field soil Fe-OC to SOC (f_Fe-OC) was significantly higher than that of reed wetland (P<0.05). Finally. there were significant positive correlations (P<0.01) between soil TN, water content, conductivity, Fe, SOC, dissolved organic carbon, and Fe-OC. This study provided scientific guidance for wetland restoration and increasing soil carbon sequestration.
- iron /
- iron-bound organic carbon /
- reed wetland /
- paddy field /
- Minjiang River estuary

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References

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