This story was first published on September 7, 2018
LISTEN: “Bringing the Forest Back After Shale Gas”
In a clearing deep in Tiadaghton State Forest, Kelly Sitch stops to look at a clump of wild bergamot, a native plant whose light purple flowers resemble pom-poms.
Bumblebees hover over the flowers on a warm summer morning, which is a good sign for Sitch. He planted the flowers here several years ago, on top of what had been a storage lot used by fracking companies operating in the forest.
“This is only a 13-by-13 foot square, but to a bumblebee, this is a fantastic ecosystem right here,” Sitch said.
The clearing is a kind of outdoor laboratory. Sitch, an ecologist with the Pennsylvania Department of Conservation and Natural Resources, and other researchers are studying ways to revive forest habitat lost to shale gas drilling on state-owned forests.
WATCH: Mock Pad Project Promo
Fracking has eaten up nearly 1,800 acres of state forest in Pennsylvania over the past decade — wiping out critical habitat for native species and creating corridors for invasive species to thrive. It’s also reduced the amount of core forest–contiguous parcels that are more than 500 acres in size — by 15,000 acres.
Sitch and his collaborators are testing how best to revive areas cleared for fracking on this site–a mock well-pad. They’ve divided the clearing into dozens of small plots, each planted with different species.
DCNR manages 2.2 million acres of state forest, including 1.5 million acres above the gas-rich Marcellus shale formation. The agency has leased more than 100,000 acres of this land to gas companies for fracking in the Marcellus shale.
Here in the Tiadaghton, the industry has cut down around 1,000 acres of forest to make way for well pads, pipelines, and compressor stations. Sitch said most of this land won’t be grown back as forests, at least not for decades.
“But there’s a lot of areas around the edge of the well pad that have been cleared or perhaps areas that were used to store water trucks or fracking equipment that’s no longer necessary when it’s just in production,” he said.
And it’s these areas, around the edges of gas development, that Sitch and his colleagues, like Patrick Drohan, want to resuscitate. Drohan, a soil scientist at Penn State, explained the problem isn’t just that the forest has been cut down. To build a well pad, companies use heavy equipment to compact the ground underneath.
“Most of the time what’s done for these types of operations is a compact (standard) called ‘no movement.’ And that standard is similar (to) when you’re building a parking lot,” he said.
That’s not good for plants. Compacted soil has fewer pores to store water or gases that a plant needs to survive.
So the research group is trying to figure out the best way to undo this process. The team brought a steamroller to the site to compact the ground the way gas companies do when they build their well pads.
They then brought in a bulldozer outfitted with a special attachment to cut into the compacted soil.
They tilled the soil to varying depths, up to 20 inches, to see which depth worked best. One row, at the far end of the plot, has not been loosened at all. Not surprisingly, it’s doing worse than the rows that have been re-tilled, Sitch said.
“That far row is much less drought tolerant than the other three rows and we’re seeing a lot more non-native invasive species that can still tolerate that very dry soil (there),” he said. “A lot of our native species, especially the grasses, are very deeply rooted. So if they can get down through 20 inches of loosened soil they’re going to be able to develop really deep, nice root systems.”
According to Sitch, the goal is to give gas companies step-by-step directions for repairing and replanting the borders of their well pads, pipelines, and other construction areas. He doesn’t think cost should be a problem for most drilling companies.
“You’re really getting down to almost less than $2,000 dollars an acre,” he said. “When you’re talking about (companies with) multimillion-dollar operations over many sites, it’s not really very much of a money commitment.”
If we’re creating habitat for insects, for songbirds, butterflies and moths, native plants — that’s a great deal of real estate.
For now, the agency isn’t proposing to make any of these methods mandatory. So far, Sitch said, gas companies have been receptive to the group’s ideas.
Because of a drop in the price of natural gas, fracking operations have been relatively slow in the forest in the last few years, according to Ben Gamble, a natural gas forester for the 150,000-acre Tiadaghton State Forest.
“For maybe two years straight, we’ve had almost nothing,” said Gamble, who is part of the mock well pad study team.
But with nearly a third of the forest leased to gas companies, he expects drilling rigs to come back if the price of gas goes up.
“We have 19 well pads that have never been drilled or fracked. So those are sitting available for future development,” he said. “We have maybe a few other well pads that weren’t completely drilled. So some of them we would expect, in time, if the economics are right, natural gas operators to come back.”
Even if the companies come back, Gamble thinks there won’t be much more forest disturbance because companies should be able to use existing roads, well pads and pipelines.
Sitch hopes once the companies are done with major construction, they can start re-foresting the edges of their development. Even if the number of acres isn’t large, they can add up.
“If you have a six-acre well pad, and after production you really only need three and a half acres –you have potentially two and a half acres there that you can work with,” he said. “Somebody might say, ‘Oh you know, it’s two and a half acres — it isn’t a lot.’ But if we’re creating habitat for insects, for songbirds, butterflies and moths, native plants — that’s a great deal of real estate. Why not get some sort of ecosystem function out of whatever acreage we can?”
For Sitch, bringing back some of the forest is better than none at all.
Photo (top): DCNR’s ‘mock well pad’ in Tiadaghton State Forest, where scientists are testing ways to rehabilitate land cleared by shale gas operations. Credit: Reid R. Frazier / The Allegheny Front
Update 4/23/2021: Researchers with the project report that the last plant growth measurements will be taken this fall in preparation for publishing the research. Patrick Drohan of Penn State shared the big takeaways:
- Soil physical loosening the first year dramatically reduced site compaction below any potential root restrictive level.
- Invasive species (crown-vetch, Canada thistle) are more prevalent in the topsoil on compacted rock section, and these invasives are more drought tolerant than natives.
- Wild bergamot is the most successful native wildflower in these sites – by 2020 it has spread into adjacent plots.
- Native grasses showed a higher increase in percent cover from 2016-2019 in ripped soil treatments.
- Native grasses Big bluestem and Virginia wild rye are able to outcompete non-native grasses in seed mixes over time.
- The primary reclamation challenges found with the compacted treatment were severely compacted soils, lack of topsoil to evenly spread during reclamation, poor grass establishment, difficult to re-establish habitat functions, un-vegetated areas easily colonized by invasive plants.
CORRECTION: A previous version misstated the amount of acreage of state forest the DCNR manages. It is 2.2 million acres, not 1.5 million acres.