铁和硫调节荷兰干的沿海泥炭地中的二氧化碳排放
Duygu Tolunay1, Gizem Ergut1, Levi Simon1
1Ecology and Biodiversity, Institute of Environmental Biology, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
概括
泥炭地中的地下水波动会形成一个过渡区,影响分解和二氧化碳 (CO2) 排放. 铁和硫的修订影响了微生物活动和温室气体 (GHG) 在变化的氧气水平下释放.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 枯竭的泥炭地表现出波动的地下水位,创造了氧化还原过渡区.
- 这些区域的特点是动态的铁 (Fe) 和硫 (S) 循环,影响分解和温室气体 (GHG) 排放.
- 了解这些过程对于准确报告管理的泥炭地温室气体排放量至关重要.
研究的目的:
- 研究铁 (Fe) 和硫 (S) 对泥炭地过渡区的分解速度和二氧化碳 (CO2) 排放的影响.
- 评估波动的氧化还原条件 (无毒和有氧) 对这些生态化学过程的影响.
- 确定铁酸铁 (Fe3+) 和硫酸盐 (SO42-) 等修改剂在调节微生物活动和温室气体释放中的作用.
主要方法:
- 控制的实验室实验,使用来自荷兰干的沿海泥炭土的泥炭样本.
- 在交替无氧和有氧条件下化,模拟波动的地下水表.
- 用铁酸铁 (Fe3+) 和硫酸盐 (SO42-) 添加或不添加乳酸盐的泥炭修正.
- 持续监测二氧化碳 (CO2) 排放,测量水溶性Fe和S,外酶活动和pH.
主要成果:
- 在无氧条件下,二氧化碳 (CO2) 排放量随着Fe3+和SO42-的修改而增加,这表明微生物刺激.
- 与对照处理相比,短期氧化抑制了二氧化碳排放.
- 水溶性Fe度保持稳定,而水溶性S度发生显著变化.
- 外酵素活动主要受到pH值的影响,修改造成的小影响.
结论:
- 泥炭地过渡区是一个高度活跃的氧化还原区,影响了分解动态.
- 现有的电子受体,特别是铁和硫化合物,显著影响微生物分解和温室气体排放.
- 将这些过渡区的动态纳入模型对于改善国家温室气体排放估计至关重要.
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