A restored marsh recovered microbial activity before it recovered its carbon stock
WHAT THE EVIDENCE SAYS
Nine sampling locations across one intact and one restored freshwater marsh spanned permanent, intermittent and non-inundated conditions. Permanent inundation was associated with lower microbial biomass-related ratios and enzyme activities. Despite the restored marsh having about half the soil carbon concentration of the intact marsh, microbial biomass and measured enzyme activities were similar between marshes.
WHY IT MATTERS / OUR READ
Process recovery and stock recovery can run on different timelines. A restoration can regain parts of microbial functioning while soil carbon remains far from the reference condition, so success metrics should distinguish activity, composition and accumulated stocks.
CAVEATS / UNCERTAINTY
Only two marshes and nine locations were studied, so restoration history and site differences are confounded. Similar microbial activity does not establish equivalent long-term carbon burial, and the authors explicitly note that higher activity could have positive or negative implications for continued carbon storage.
SOURCE
Freshwater Biology — primary study
View original evidence ↗
Two eastern-Ontario marshes had similar microbial biomass and enzyme activity even though the restored marsh held only about half the soil carbon of the intact marsh.
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