Carbon Stability of Biochar and Its Effects on Soil Organic Carbon Mineralization in Coastal Wetlands

被引：0

作者：

Zhang, Hua-Jie ^{[1
]}

Chen, You-Yuan ^{[1
,2
,3
]}

Wang, Lei ^{[4
]}

Ye, Sheng-Ying ^{[1
]}

Wang, Ya-Een ^{[1
]}

Sun, Xue-Ling ^{[1
]}

机构：

[1] College of Environmental Science and Engineering, Ocean University of China, Qingdao

[2] Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao

[3] Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao

[4] North China Municipal Engineering Design & Research Institute Co.，Ltd., Tianjin

来源：

Huanjing Kexue/Environmental Science | 2025年 / 46卷 / 02期

关键词：

biochar; carbon stability; coastal wetlands; organic carbon mineralization; soil aggregates;

D O I：

10.13227/j.hjkx.202402076

中图分类号：

学科分类号：

摘要：

Biochar has a significant influence of both enhancing carbon sequestration in coastal wetlands and reducing greenhouse gas emissions. However，the carbon sequestration potential of biochar and the pathways that influence soil organic carbon（SOC）mineralization are still unclear. Biochar carbon stability experiments revealed the carbon sequestration potential of biochar prepared using different pyrolysis temperatures. Additionally，the effects and pathways of different biochar additions（0%，0.1%，1.5%，and 3%）on the mineralization of SOC were explored through soil mineralization experiments and a path model. The results showed that as the preparation temperature of biochar increased from 300℃ to 600℃，the carbon loss due to chemical oxidation decreased from 46.82% to 14.11%，and the microbial mineralization amount decreased from 3.5% to 0.2%，suggesting that the carbon sequestration potential of biochar at 600℃ was better. Soil mineralization experiments were conducted using 600℃ biochar. The addition of 1.5% biochar resulted in the lowest mineralization rate. The use of biochar increased the SOC content by 1.83 to 3.94 times and decreased the accumulated mineralization amount by 3.43% to 19.1%. The partial least squares path model was used to quantify and reveal the pathways of biochar affecting SOC mineralization in coastal wetlands，as follows：Biochar released a high content of stabilized carbon that is not easily utilized by microorganisms，leading to a low mineralization rate，and biochar increased the content and stability of macroaggregates that physically encapsulated the SOC，promoting carbon sequestration and inhibiting SOC mineralization. This study showed that enhancing the carbon stability of biochar and inhibiting SOC mineralization can enhance the carbon sequestration capacity of coastal wetlands. © 2025 Science Press. All rights reserved.

引用

页码：1025 / 1031

页数：6

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