| 生物炭碳稳定性及对滨海湿地土壤有机碳矿化的影响 |
| 摘要点击 1232 全文点击 149 投稿时间：2024-02-15 修订日期：2024-04-27 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 生物炭 碳稳定性 滨海湿地 有机碳矿化 土壤团聚体 |
| 英文关键词 biochar carbon stability coastal wetlands organic carbon mineralization soil aggregates |
|
| 中文摘要 |
| 生物炭对增强滨海湿地固碳能力和减少温室气体排放具有重要意义. 然而,生物炭的固碳潜力和对土壤有机碳（SOC）矿化的具体作用路径仍不明确. 本研究通过生物炭稳定性实验阐明不同热解温度生物炭的固碳潜力,通过土壤矿化实验和路径模型等方法,探究不同生物炭添加量（0%、0.1%、1.5%和3%）对SOC矿化的影响效果和路径. 结果表明,随着生物炭制备温度从300℃升高到600℃,化学氧化的碳损失量由46.82%下降到14.11%,微生物矿化量由3.5%降到0.2%,表明600℃生物炭的固碳潜力较佳. 采用600℃生物炭进行土壤矿化实验,生物炭使SOC含量增加了1.83~3.94倍,累积矿化量降低了3.43%~19.1%,其中1.5%添加量生物炭的矿化速率最低. 使用偏最小二乘路径模型（PLS-PM）量化并揭示了生物炭影响滨海湿地SOC矿化路径：生物炭释放的稳定碳含量高,不易被微生物利用,矿化速率低；生物炭增加大团聚体含量和稳定性,对SOC进行物理包裹,实现碳封存,抑制SOC矿化. 研究表明增加生物炭碳稳定性和抑制SOC矿化可提高滨海湿地固碳能力. |
| 英文摘要 |
| 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. |
|
|
|
