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Wetland restoration is often promoted as a definitive way to support wildlife, improve water quality and help store carbon. However, new research from 黑料网爆吃瓜 suggests the overall climate picture is more complicated.

In a of human-made marshes along the Bay of Fundy, researchers found that parts of these restored wetlands are releasing methane, a greenhouse gas 27 times more potent than carbon dioxide. The findings highlight the importance of addressing nuances and closely evaluating one-size-fits-all climate solutions.

The researchers examined freshwater marshes created by reflooding former agricultural land established by early settlers several centuries ago. Once tidal salt marshes, the areas were drained and farmed, then later restored as enclosed water bodies to support wildlife, especially waterfowl.

To understand their climate impact, the researchers focused on the open water sections, which look like small lakes. Using inflatable kayaks, they collected water and gas samples and installed 鈥渂ubble traps鈥� to capture gases rising from sediments.

鈥淭hese impoundments released methane into the atmosphere, contributing to the greenhouse effect,鈥� said Rachel Plant, lead author of the study, who conducted the research as a master's student in the Department of Geography. 鈥淭hey generally had higher gas emissions than those of the natural lakes and ponds that we compared them to."

Researchers think this may be linked to how the wetlands function. Unlike natural systems with flowing water, these impoundments are largely closed, receiving water mainly from precipitation, which can limit oxygen and favour methane production.

Only one piece of wetlands鈥� climate impact

The findings do not mean restored wetlands are a net negative, the researchers emphasize, adding that this study examined only one component of the system. Carbon stored in plants and sediments, which can offset emissions, was not included.

鈥淭his is a small piece of the puzzle,鈥� Plant said. 鈥淚f you exclusively look at my study, it would seem that these wetlands aren鈥檛 that great. But I think they鈥檙e hiding a lot of good qualities, such as creating habitat for wildlife and recreational uses for the public, and I think they do a lot of good.鈥�

Researchers say that nuance and balance matter, to guide governments and conservation groups working on nature-based solutions. For example, though methane production is undesirable, constructed wetlands provide habitat for birds, support biodiversity and can benefit local communities.

Ongoing research from will look at how different parts of these systems store carbon and whether design choices or water management could reduce methane emissions.

About the study

by Rachel Plant, Matthew Bogard, Wendy Ampuero-Reyes, Chun Ngai Chan, and Gail Chmura., was published in the Journal of Geophysical Research-Biogeosciences. It was funded by Environment and Climate Change Canada through the project 鈥淲etlands as Nature-Based Climate Solutions鈥�.