控制美国潮湿地的孔水甲度的空间变化
Erika L Koontz1, Sarah M Parker2, Alice E Stearns2
1Smithsonian Environmental Research Center, 647 Contees Wharf Road, Edgewater, MD 21037, United States of America; Horn Point Laboratory, University of Maryland Center for Environmental Science, 2020 Horns Point Road, Cambridge, MD 21613, United States of America.
The Science of the total environment
|November 4, 2024
概括
潮湿地排放甲 (CH4),是一种强大的温室气体. 硫酸盐度最能预测CH4排放量,盐度作为绘制这些排放量跨景观的有用代理.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 生态生态学 生态生态学
背景情况:
- 潮湿地是显著的温室气体下沉地,但甲 (CH4) 排放可以在不同的环境和人为条件下抵消这种能力.
- 对于土地管理者和政策制定者来说,准确地绘制潮湿地的CH4属性对于恢复和温室气体清单至关重要.
- 在详细的基于点的CH4采样和更广泛的映射产品之间存在空间尺度的不匹配,这阻碍了有效的升级.
研究的目的:
- 为了研究孔水中CH4度与潮湿地的环境变量 (盐度,硫酸盐,,铁) 之间的关系.
- 确定不同空间尺度上CH4度的最佳预测指标.
- 评估盐度作为硫酸盐和CH4的替代品在测绘工作中的实用性.
主要方法:
- 在美国27个潮湿地的孔水CH4,盐度,硫酸盐 (SO42-), (NH4+) 和总铁 (Fe) 的空间分层采样.
- 在四个数量级上分析CH4度.
- 将细分线性回归应用于与环境预测因素相关的CH4度模型.
主要成果:
- 井水中CH4度的最佳解释是硫酸盐 (SO42-) 度 (R2 = 0.54),降低灵敏度低于0.62mM SO42-.
- 盐度是SO42- (R2 = 0.909) 和CH4 (R2 = 0.319) 的一个强有力的,虽然不那么精确的代理.
- 无论是氨,总铁,还是潮升高都与CH4没有显著的相关性,尽管氨与硫酸盐相关.
结论:
- 空间尺度,特别是场地间和场地内的变化,显著影响CH4变异.
- 硫酸盐度是CH4度的主要驱动因素,盐度作为潜在的映射代理.
- 未来的研究应该专注于站内和站间的梯度,并探索额外的预测因素,以完善潮湿地的CH4绘图.
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