N.W.T. forests absorb more carbon than territory emits most of the time - Action News
Home WebMail Monday, November 11, 2024, 01:45 AM | Calgary | -0.5°C | Regions Advertise Login | Our platform is in maintenance mode. Some URLs may not be available. |
North

N.W.T. forests absorb more carbon than territory emits most of the time

A report published by Natural Resources Canada aims to provide a baseline of information about forests in the territory that can be used to measure future changes. It has details about how much carbon is stored and absorbed by N.W.T. forests.

The territory only emitted more carbon than it sequestered 5 years out of 30

A small plume of smoke rises above a stand of green trees against a hazy blue sky.
Smoke from a hot spot can be seen in a stand of trees along the N.W.T.'s Highway 1 about 50 kilometres outside of Wrigley. Territorial data shows that, unless it's a significant fire year, forests in the N.W.T. sequester more carbon dioxide than the entire territory emits. (Liny Lamberink/CBC)

Forests in the N.W.T. absorb way more carbon than the entire territory emits most of the time.

"The forest is an enormous resource, and I am overwhelmed by it, to be honest," said Jakub Olesinski, a forest ecologist with the territory's environment departmentand one of the authors of a report on the state of forests in the N.W.T.

The purpose of the report, published by Natural Resources Canada (NRCan) earlier this year, is to provide a baseline of information about forests in the territory that can be used to measure future changes such as those caused by climate change.

It includes details about carbon stored in the natural environment.

Carbon stocks, said Olesinski, are a "snapshot" of carbon in the forest at a given point in time. According to the report, the Taiga Plains ecoregion of the N.W.T., where most of the N.W.T.'s forests are located, had a stock of about 3 billion tonnes of carbon.

Green zone on a map surrounding the Mackenzie Valley, and covering about one third of the NWT, showing the area known as the
A map that shows the Taiga Plains ecoregion in the N.W.T., within Canada. (Department of Environment and Natural Resources)

But carbon stocks change because, as Olesinski explained, forests are dynamic.

"[The forest] has a capacity to grow over time, which means it takes the carbon in, but it also breathes, which releases the carbon, and it decomposes, which also releases the carbon."

He emphasized, instead, looking at how carbon fluctuates measuring whether forests acted as a net source of carbon or a net sink of carbon in a particular year.

Kathleen Groenewegen, an inventory and analysis forester with the department, said from 1990 to 2019, managed forests in the N.W.T. (which are almost entirely in the Taiga Plains ecoregion) were usually a sink for carbon, sucking in, on average, 7 million tonnes of carbon dioxide equivalent.

In 2019 alone, managed forests which represent just 17 per cent of all forests in the N.W.T. sequestered 14 million tonnes of carbon dioxide. To compare, the territory emitted 1.6 million tonnes of carbon dioxide that year,which is about nine times less than what was sequestered,according toEnvironment and Climate Change Canada's latest inventory report.

Groenewegen said on average, managed forests sequester four times more carbon dioxide than the N.W.T. emits.

A road with blackened trees on the right and along the rolling landscape.
A burned stand of trees about 50 kilometers south of Wrigley in July 2022. (Liny Lamberink/CBC)

There were only five years each of them big fire years where the forests emitted more carbon than they absorbed: 1994, 1995, 1998, 2014 and 2015. NRCan has said the 2014 wildfire season, the worst on theN.W.T.'s record, released 94.5 million tonnes of carbon into the air.

Wildfires not a threat?

Climate change is expected to exacerbate wildfires in Canada, but Olesinski and Groenewegen said they would not characterize fires as a risk to carbon that is sequestered by forests in the N.W.T.

They both pointed out that wildfires are a natural part of the ecosystem.

Olesinski also said there isn't enough information yet to determine if the "fire regime" in the N.W.T. is changing. A fire regime describes patterns of seasonality, frequency, size, intensity and type of fire in a particular area or ecosystem.

"Our fire history only goes back to the 1960s. We're working on expanding beyond, but it's not easy work to understand how it looked like a few centuries ago," he said.

Olesinski said there are other pieces of information like how much carbon is in peatlands and permafrost needed to figure out when, if ever, the forest ecosystem in the N.W.T. could hit a tipping point and irrevocably become a consistent source of carbon instead of a sink.

Steven Nitah is currently the managing director for Nature for Justice Canada. He says the fact forests and other types of ecosystems in the N.W.T. can sequester so much carbon makes them 'globally significant.' (Sheldon Alberts/Conservation through Reconciliation Partnership)

Steven Nitah, who calls Yellowknife home, is currently themanaging director for Nature for Justice Canada.He saidthe territory needs to consider how it can use the report's datato manage ecosystems in a way that fulfils its responsibility to the global community.

He said the factforests and other types of ecosystemsin the N.W.T. can sequester so much carbon makes them "globally significant." He said this factshould not be considered a licence for the territorytocontinue emitting the same amount of carbon dioxide into the air.

Nitah also said that there is "definitely" more carbon stored below ground in the N.W.T. than above.

Last year, a University of Alberta researcher told CBC News that peatlands cover230,000 square kilometres of land in the N.W.T. and store 24 billion tonnes of carbon. Olesinski said the territory isn't ready to report its own data on carbon in peatlandsyet.

But it is something that's being developed all in an effort to measure future changes, and predict them.