California Gov. Gavin Newsom has vetoed a bill aimed at deprioritizing commercial logging in a unique state forest system, arguing the measure would jeopardize the ability to test best management practices.

At issue are the state’s 14 demonstration forests — managed by the California Department of Forestry and Fire Protection, or Cal Fire — which are billed as “living laboratories” for forest management practices. Under existing law, they’re directed to produce as much timber as can be sustained over time, while considering factors like recreation and wildlife.

Assembly Bill 2494 would have eliminated what’s often characterized as a logging mandate in favor of prioritizing values such as carbon storage, wildfire resilience and biodiversity conservation. It also would have directed state officials to seek agreements with Native American tribes to integrate their traditional knowledge into managing the land.

In Newsom’s veto message, he said the forests “produce cutting-edge strategies that inform forest management on public and private lands across California,” which is key for fighting climate change and improving wildfire resilience.

“By narrowing the management of these forests to a limited set of public benefits, this bill risks the state’s ability to fully demonstrate the best science-based practices,” he wrote Friday. “At a time when California is racing to keep pace with a rapidly changing climate, we cannot afford to lose the flexibility needed to safeguard our forests for future generations.”

The move deals a blow to a grassroots coalition that included tribes, environmentalists and mountain bikers, some of whom have fought for decades to rein in logging at Jackson Demonstration State Forest in Mendocino County. In recent years, activists have staged protests and tree sits, harkening back to the “timber wars” of the 1980s and ‘90s.

The bill grew in part out of discussions with constituents who wanted to see the forest run differently, according to its author, Assemblymember Chris Rogers, D-Santa Rosa.

Rogers, who represents the North Coast, called Newsom’s veto message “nonsensical” and said it didn’t reflect the language of the bill.

“Current law says that the guiding principle for the management of the forests is maximum sustained production of high-quality wood products,” he told The Times. “That’s much more narrow as a directive on how to manage those lands than by expanding it to include biodiversity, carbon sequestration, research, recreation.”

Polly Girvin, who pushed for changes at Jackson along with her late partner and tribal leader Priscilla Hunter, said the fight will continue under California’s next governor. She wants to see Native Americans take an even stronger leadership role going forward, pointing to rights afforded to them by state law.

“Our local tribal voice is not pro-logging; it’s really to keep the world in balance, to honor the cries of the ancestors, to try to save the trees from commercial logging,” said Girvin, a retired attorney focused on Native American law.

Leaders in Mendocino and Humboldt counties backed the measure. Humboldt County Supervisor Steve Madrone saw it as codifying practices that could help rebuild trust in the community, which he said Cal Fire had lost.

“It was not going to restrict it from being able to do all kinds of things,” he said. “Frankly, it was going to be better than just letting them kind of focus on board feet.”

Cal Fire’s Kevin Conway, who oversees the state’s demonstration forests, said he could not comment on the measure.

The bill was opposed by the Rural County Representatives of California, an advocacy group representing 40 counties, along with many in the timber and agriculture industries.

Staci Heaton, senior policy advocate for RCRC, echoed Newsom’s concerns that the legislation would have limited what could be done in the forests to achieve resilience, such as the ability to harvest trees of different sizes and types. She said they also had concerns about the funding structure and what she described as vague definitions in the bill, which could invite litigation.

“We appreciate the governor signaling that we’re going to continue to use sound forest management in California,” Heaton said.

Asked about the disagreement among some counties, she said there tends to be “more of a split in what people think good forest management looks like” when it comes to coastal redwood forests.

“We maintain that a lot of our forests really aren’t healthy in their current condition, and there’s too many straws in the ground, and there does need to be, in some areas, more aggressive management,” she said.

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