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In this study, researchers compiled landscape-scale evidence of historical fire severity patterns in the ponderosa pine and mixed-conifer forests from published literature sources and stand ages available from the Forest Inventory and Analysis program in the USA. The consensus from this evidence is that the traditional reference conditions of low-severity fire regimes are inaccurate for most forests of western North America. Instead, most forests appear to have been characterized by mixed-severity fire that included ecologically significant amounts of weather-driven, high-severity fire.
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This article argues that decisions regarding planned wildfire are marred by an anachronistic and inaccurate distinction between “natural” and “anthropogenic” fire. Rationalizing that unplanned wildfires are “natural,” the federal government excludes pollutants from such fires from air quality compliance calculations at the same time it encourages states to vigorously control pollutants from “anthropogenic,” prescribed fires. The result contributes to an undervaluation of necessary, planned wildfire. Several solutions are suggested to remove these distortions, including adopting a default rule whereby all wildfire smoke, of whatever origin, “counts” for purposes of air quality compliance.
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This synthesis describes what is known about the cumulative impacts of historic livestock grazing patterns and short-term effects of livestock grazing on fuels and fire in sagebrush ecosystems. Over years and decades grazing can alter fuel characteristics of ecosystems. On a yearly basis, grazing can reduce the amount and alter the continuity of fine fuels, potentially changing wildlife fire spread and intensity. However, how grazing-induced fuel alterations affect wildland fire depends on weather conditions and plant community characteristics. As weather conditions become extreme, the influence of grazing on fire behavior is limited, especially in communities dominated by woody plants.
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This study found that growth rate of cheatgrass increased in both warming and snowmelt treatments. Largest increases occurred in warming plots during the wettest year, indicating that the magnitude of response to warming depends on moisture availability. Results indicate that increasing temperature will exacerbate cheatgrass impacts, especially where warming causes large reductions in the depth and duration of snow cover.
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This research brief from the California Fire Science Consortium discusses that detrimental consequences from future fires under changing climates could be reduced by recognizing diverse adaptions to fire in different forest types and by preparing forests and people for larger and more frequent fires.
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This study examined stand structure and development of mixed-conifer ecosystems in the south-central Great Basin where pinyon (Pinus monophylla) and juniper (Juniperus osteosperma) are found together with other species, such as ponderosa pine (Pinus ponderosa). Because wildfire regime and land-use changes were not identical between the study sites, and increases of pinyon-juniper populations have occurred in other Great Basin areas at about the same time, climate was the most likely driver. Therefore, pinyon-juniper woodlands, which have recently experienced dramatic episodes of climate-related dieoffs in regions where pinyon is present, have not been negatively impacted by climate in the Great Basin, where the pinyon species is Pinus monophylla.
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In this study, researchers measured particulate sediments transported by wind to assess risks to areas downwind of burned rangelands in SE Idaho. Results indicate that wildfire can convert a relatively stable landscape into one that is a major dust source.
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This study explored how fire and various other natural events might shape sagebrush ecosystems in eastern Oregon, USA, and whether those events could affect fire rotation. Results suggested other disturbance events were important in shaping all but the most productive sagebrush communities and influenced fire rotation in drier sagebrush communities. Insects and pronghorn browsing may have been as important as fire in shaping sagebrush-steppe landscapes with freezekill and snow mold locally important.
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This study highlights that forbs are important for survival of sage grouse chicks, but it can be hard to grow enough forbs under sagebrush canopies dense enough to meet recommended cover levels. Selective thinning and targeted cattle grazing may offer a path to a win/win solution.