Skip to content
Ecological Intelligence

Ecological evidence.
Independent perspective.
Explore Wild Lands ↗

Ecological Intelligence / Subject

methane

Peer-reviewed North America

Rewetting streams stored more soil carbon—and released more methane in one treatment

Evidence
Peer-reviewed
Geography
Northern New Mexico, United States
System
Riparian meadow / stream restoration / soil carbon

WHAT THE EVIDENCE SAYS

Researchers sampled riparian soils near reaches restored with plug-and-ponds or beaver dam analogs. After three years, particulate organic carbon at plug-and-pond sites increased from about 22.3 to 62.5 grams carbon per kilogram, while measured methane flux rose from about 0.14 to 1.73 micrograms carbon per square meter per second. Beaver dam analog sites did not show consistent carbon or moisture increases, perhaps in part because steeper slopes limited sustained wetting.

WHY IT MATTERS / OUR READ

Managers should budget for both intended soil processes and greenhouse-gas tradeoffs, and evaluate terrain before assuming methods with similar names produce similar hydrology.

CAVEATS / UNCERTAINTY

Preliminary calculations suggest the added methane did not outweigh soil-carbon benefits, but they are not a full life-cycle climate accounting. Observational sites differ in slope and restoration design, and soil-carbon fractions are not identical to durable whole-site sequestration.

SOURCE

Restoration Ecology / USDA Forest Service — Krichels et al. (2026)
View original evidence ↗

A northern New Mexico comparison found different carbon and methane responses from plug-and-ponds and beaver dam analogs.

Read the Wild Lands assessment →
Peer-reviewed Europe

Peatland rewetting raised methane relative to drained controls—without invalidating restoration

Evidence
Peer-reviewed
Geography
Nutrient-poor forestry-drained peatlands, eastern Finland
System
Boreal peatland rewetting; methane; carbon-water tradeoffs

WHAT THE EVIDENCE SAYS

Field measurements one and two years after peatland restoration compared alternative ditch blocking and filling methods with drained and undrained reference areas in eastern Finland. Methane fluxes increased after rewetting relative to drained controls but stayed below the undrained natural reference; fluxes rose between years one and two along with developing vegetation. Site conditions and ditch-filling methods shaped early responses.

WHY IT MATTERS / OUR READ

The counter-signal is that restoring a wetland can improve hydrologic and ecological processes while making one greenhouse-gas flux look worse at first. This is a reason to account for CO2, methane, water table and biodiversity across decades, not an argument that rewetting is a failure.

CAVEATS / UNCERTAINTY

Only early post-restoration methane flux was compared, not full lifetime CO2-equivalent climate balance, long-term vegetation outcomes or all peatland types. Method effects can change as soil and vegetation recover.

SOURCE

Theodorou et al. · Wetlands · Finnish drained-peatland rewetting methane
View original evidence ↗

Two early Finnish years reveal a real greenhouse-gas tradeoff whose size depends partly on ditch treatment.

Read the Wild Lands assessment →
Peer-reviewed Latin America & Caribbean

A high-Andean wetland metagenome found carbon-processing novelty, but little genomic support for methanogenesis

Evidence
Peer-reviewed
Geography
Chingaza páramo, Colombia
System
High-Andean wetland soils

WHAT THE EVIDENCE SAYS

Researchers reconstructed 109 high-quality microbial genomes across páramo wetland ecosites, including lineages without described genus-level representatives. Carbon-fixation, sulfur and other metabolic pathways were common, while methanogenesis markers were not recovered from the high- and medium-quality genomes; a low-abundance methanogen signal remained detectable at the read level.

WHY IT MATTERS / OUR READ

Microbial novelty is still a major uncertainty in high-elevation wetland carbon models. The study also shows why absence of a pathway in reconstructed genomes should be interpreted differently from absence of the process in the ecosystem.

CAVEATS / UNCERTAINTY

Metagenomic reconstruction is incomplete and does not measure methane flux. Rare organisms can be missed by genome assembly, and the low-abundance read-level methanogen signal argues against treating the result as evidence that the wetland produces no methane.

SOURCE

ISME Communications — accepted research article
View original evidence ↗

Genome-resolved sampling in Colombia’s páramo recovered many previously undescribed microbial lineages while methanogenesis markers remained scarce in the assembled genomes.

Read the Wild Lands assessment →
Peer-reviewed North America

Wetland carbon models scaled CO₂ better than methane

Evidence
Peer-reviewed
Geography
Southeastern United States
System
Freshwater and salt-marsh wetlands

WHAT THE EVIDENCE SAYS

Using data from 24 freshwater and salt-marsh sites, researchers compared machine-learning models for gross primary production, ecosystem respiration, net ecosystem exchange and methane flux. CO₂-related performance was moderate, while methane models were substantially weaker, reflecting the strong local influence of soil and hydrologic conditions.

WHY IT MATTERS / OUR READ

Regional upscaling is valuable, but greenhouse-gas certainty is pool-specific. A model that performs acceptably for CO₂ exchange should not inherit the same confidence for methane.

CAVEATS / UNCERTAINTY

The site network and input variables constrain generalization, and predictive skill for methane was modest. Model agreement is not a substitute for field validation when management or accounting depends on site-level fluxes.

SOURCE

Ecological Processes — primary modeling study
View original evidence ↗

An ensemble model built from 24 southeastern U.S. wetland sites produced useful regional CO₂ estimates, but methane remained much harder to predict.

Read the Wild Lands assessment →

Keep exploring

Follow the systems. Find the connections.

WildlifeLandWaterOceansClimateCitiesOne HealthGovernanceMethods / Monitoring
Browse the archive →