Silvicultural Treatments Hasten Seedling Growth in Boreal Treed Fens
Seismic lines in western Canada’s boreal region are linear disturbances that affect the habitat of threatened woodland caribou (Rangifer tarandus caribou). To hasten the return of forest cover and ultimately to restore caribou habitat, restoration managers use silviculture treatments in wet areas that involve the mechanical mounding of seismic lines to create artificial hummocks. Tree planting then takes place on top of these hummocks. However, the effectiveness of this silviculture technique for restoring seismic lines in peatlands is largely untested.
BERA researchers sampled incremental height growth of coniferous seedlings at 41 seismic line plots in poor and rich treed fens in northeast Alberta, Canada. They compared lines that had been treated with inverted mounding (a type of mechanical mounding) and subsequent tree planting, to nearby lines that were left untreated for natural recovery. Overall, they found that mounding and tree planting improved seedling growth compared to seismic lines regenerating naturally. However, growth responses were found to vary by species, ecosite, initial seedling size, and light availability.
For the full article click here.
Most Lines in Mesic Uplands Can be Left for Natural
Alberta’s legacy seismic lines need restoration actions, but the sheer volume of lines on the landscape is daunting. Part of the challenge involves distinguishing lines that require active treatments from those that can be left for natural. Wildfires are the dominant disturbance agent in the boreal forest and can be an effective promoter of natural restoration in the right situations.
BERA researchers have previously published on the topic of wildfire effects on natural tree growth in jack pine forests and treed peatlands. Here, they tackle mesic upland forests. The work shows that tree regeneration density is 65% higher on burnt lines than unburnt lines in this ecosite type, and that fires can effectively “erase” lines from the surrounding matrix. However, even unburnt lines in the study had high rates of natural regeneration. This suggests that most lines in mesic upland forests can be effectively left for natural. These findings could help prioritize limited restoration dollars to more challenging ecosite types.
For the full article click here.
How Mounds are Made Matters
Mounding is a common restoration technique designed to improve microsite conditions for planted seedlings in wetlands. There are a variety of strategies for constructing mounds, though, and how mounds are made matters. In this paper, Kim Kleinke and colleagues in the Soils and Ecohydrology team show how new mounding techniques – intact mounding and hummock transfer – result in higher soil quality than current methods of inverted mounding.
For the full article click here.
How Lincoln’s Sparrows Adapt to Chronic Noise
Noise from industrial disturbance can affect the behaviour of songbirds and other wildlife in northern Alberta. In this research, Natalie Sanchez and colleagues in the Humans/Wildlife team show of Lincoln’s sparrow have adapted their song patterns to deal with chronic noise from compressor stations.
To read the peer-reviewed article behind this research, click here.
Using satellites to capture regeneration on harvested forest areas reveals regional differences
Up-to-date monitoring of forest disturbance and recovery at large scales is a critical challenge. BERA research partners at the ABMI developed a repeatable, scalable, and adaptable workflow for capturing broad patterns in post-harvest forest regeneration using long-running satellite image archives and Google’s Earth Engine platform. Their work produced a public dataset of Alberta-wide harvest area spectral regeneration available at www.abmi.ca.
For the full article click here.
Linear Disturbances Shift Boreal Peatland Plant
Communities Toward Earlier Peak Greenness
BERA researchers are using smartphone technology to understand the effects of seismic lines on peatland functioning, revealing important phenological shifts and greater CO2 uptake in disturbed areas. Read the manuscript here.
Towards Drone-Based Establishment Surveys
BERA researchers at the Canadian Forest Service and University of Calgary are teaming up to shows how drones could potentially replace ground-based seedling establishment surveys, reducing costs, increasing survey area, and avoiding trampling over restored terrain. One important step towards that process involves using drones to measure seedling height. Read the manuscript here.
Seismic Line Geometry Affects Tree Regeneration
Seismic Line Treatments Alter Peatland Soil Properties
Open Access Software Tools for Researchers and Land Managers
Most linear-feature databases work fine for cartographic purposes but are not up to the demands of detailed research and restoration planning. Researchers in BERA’s Remote Sensing Team tackled this problem by developing the Forest Line Mapper: a free, open-access software kit you learn more about here.
Fires Help Erase Seismic Lines in Peatlands
Seismic lines alter a host of ecosystem processes in the boreal forest, and many of those lines are in a state of arrested succession. Restoration managers have to choose: active restoration (mounding, planting, other treatments) or passive (leave for natural)? Researchers in BERA’s Vegetation Team are helping to understand the role of fire in this equation. Read about some of their work here.
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