Charcoal in ponderosa pine ecosystems of western Montana| decomposition, mineralization, and quantification
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Wildfire-Produced Charcoal Directly Influences Nitrogen Cycling in Ponderosa Pine Forests
Fire is the primary form of disturbance in temperate and boreal forest ecosystems. However, our knowledge of the biochemical mechanisms by which fire stimulates forest N cycling is incomplete. Charcoal is a major byproduct of forest fires and is ubiquitous in soils of most forest ecosystems, yet the biological function of charcoal in soils of forest ecosystems has been greatly overlooked. We co...
متن کاملRestoration treatments in a Montana ponderosa pine forest: Effects on soil physical, chemical and biological properties
Low-elevation ponderosa pine ecosystems of the inland northwestern United States experienced frequent, low-severity fire that promoted open stands dominated by large diameter ponderosa pine (Pinus ponderosa). Fire exclusion has led to increased stand densities, often due to proliferation of less fire-tolerant species and an increased risk of stand-replacing wildfire. These fundamental changes h...
متن کاملMountain pine beetle selectivity in old-growth ponderosa pine forests, Montana, USA
A historically unprecedented mountain pine beetle (MPB) outbreak affected western Montana during the past decade. We examined radial growth rates (AD 1860-2007/8) of co-occurring mature healthy and MPB-infected ponderosa pine trees collected at two sites (Cabin Gulch and Kitchen Gulch) in western Montana and: (1) compared basal area increment (BAI) values within populations and between sites; (...
متن کاملPURCHASED BY USDA FOREST SERVICE FOR OFFICIAL USE Seedling Responses of Five Species of Western Conifers to Simulated Ambient Sulfur Dioxide Exposures
Seedlings of ponderosa pine, Douglas-fir, white fir, Engelmann spruce, and subalpine fir were exposed continuously to charcoal-filtered (CF) air or one of three levels of a simulated ambient exposure typical of SO, pollution near smelters in the western United States. Seedlings were exposed during winter-spring experiments for 60 days to hourly means of 17, 38, and 54 ppb in 1988 and 35, 57, an...
متن کاملNitrogen spatial heterogeneity influences diversity following restoration in a ponderosa pine forest, Montana.
The resource heterogeneity hypothesis (RHH) is frequently cited in the ecological literature as an important mechanism for maintaining species diversity. The RHH has rarely been evaluated in the context of restoration ecology in which a commonly cited goal is to restore diversity. In this study we focused on the spatial heterogeneity of total inorganic nitrogen (TIN) following restoration treat...
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