Amazonian peatlands: A potentially important but poorly characterised source of atmospheric methane and nitrous oxide

亚马逊泥炭地：大气甲烷和一氧化二氮的潜在重要但特征不明确的来源

基本信息

批准号：
NE/I015469/1
负责人：
Yit Arn Teh
金额：
$ 6.81万
依托单位：
University of St Andrews
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2011
资助国家：
英国
起止时间：
2011 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FI015469%2F1
关键词：
Amazonian peatlands potentially important but

项目摘要

Tropical peatlands are spatially extensive and biogeochemically dynamic environments that play a critical role in the cycling of greenhouse gases between the biosphere and atmosphere. However, we have relatively few ground-based measurements of greenhouse gas exchange from these ecosystems, as attention has largely focussed on fluxes from terra firme forests, savannas and seasonally flooded environments. The few observations that do exist originate from Indonesia and the Malay Archipelago, with little or no data available from lowland Amazonia. This makes it difficult to accurately assess the relative contribution of Amazonian peatlands for regional or global greenhouse gas budgets, or to predict how emissions from these environments are likely to change due to climate forcing or anthropogenic intervention. We propose conducting some of the first pilot measurements of methane and nitrous oxide fluxes from Amazonian peatlands, in order to begin exploring the significance of these ecosystems for regional and global atmospheric budgets. We will also explore the relationships between trace gas fluxes and key biophysical drivers (e.g. peat depth, water table depth, soil moisture, temperature, etc.), which will help us to better understand how methane and nitrous oxide fluxes are influenced by ecological processes and environmental conditions. These process-based data will allow us to predict the likely outcome of future environmental change or human disturbance, and will be useful for future modelling efforts. This research is important and timely because of ongoing debates over the relative importance of tropical peatlands for current and future climate change. The need for studies like this are particularly acute for regions like the Amazon Basin, because of the rapid pace of development and land use change, which may trigger enhanced carbon losses, greenhouse gas emissions and habitat degradation, all of which may act as a positive feedback to climate change.

热带泥炭地在空间上是广泛的生物地球化学动态环境，在生物圈和大气之间的温室气体循环中起着至关重要的作用。但是，我们从这些生态系统中对温室气体交换的基于地面的测量很少，因为人们的注意力主要集中在Terra Firme森林，Savannas和季节性洪水泛滥的环境上。确实存在的少数观察结果来自印度尼西亚和马来群岛，而低地亚马逊的数据很少或根本没有。这使得难以准确评估亚马逊泥炭地在区域或全球温室气体预算中的相对贡献，或者预测由于气候强迫或人为干预而导致的这些环境的排放可能会发生变化。我们建议对亚马逊泥炭地进行一些对甲烷和一氧化二氮通量进行一些试点测量，以便开始探索这些生态系统对区域和全球大气预算的重要性。我们还将探索痕量气体通量与关键生物物理驱动器（例如泥炭深度，地下水位深度，土壤水分，温度等）之间的关系，这将有助于我们更好地了解甲烷和一氧化二氮通量如何受到生态过程和环境条件的影响。这些基于过程的数据将使我们能够预测未来环境变化或人类干扰的可能结果，并将对未来的建模工作有用。这项研究很重要，及时，因为关于热带泥炭地对当前和未来气候变化的相对重要性的持续辩论。对于像亚马逊盆地这样的地区，对这样的研究的需求特别急切，因为开发和土地利用变化的速度迅速，这可能会触发增强的碳损失，温室气体排放和栖息地退化，所有这些都可能是对气候变化的积极反馈。