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This study used a genecological approach to explore genetic variation for survival in Artemisia tridentata (big sagebrush). It found evidence of adaptive genetic variation for survival. Plants from areas with the coldest winters had the highest levels of survival, while populations from warmer and drier sites had the lowest levels of survival. Survival was lowest, 36%, in the garden that was prone to the lowest minimum temperatures. These results suggest the importance of climatic driven genetic differences and their effect on survival. Understanding how genetic variation is arrayed across the landscape, and its association with climate can greatly enhance the success of restoration and conservation.
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Sage-grouse obtain resources for breeding, summer, and winter life stages from sagebrush communities. Grazing can change the productivity, composition, and structure of herbaceous plants in sagebrush communities, thus directly influencing the productivity of nesting and early brood-rearing habitats. Indirect influences of livestock grazing and ranching on sage-grouse habitat include fencing, watering facilities, treatments to increase livestock forage, and targeted grazing to reduce fine fuels. To illustrate the relative value of sagebrush habitats to sage-grouse on year-round and seasonal bases, we developed state and transition models to conceptualize the interactions between wildfire and grazing in mountain and Wyoming big sagebrush communities. In some sage-grouse habitats, targeted livestock grazing may be useful for reducing fine fuels produced by annual grasses. We provide economic scenarios for ranches that delay spring turnout on public lands to increase herbaceous cover for nesting sage-grouse. Proper rangeland management is critical to reduce potential negative effects of livestock grazing to sage-grouse habitats.
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Fire can be a useful tool for promoting migrations of shade-intolerant wind dispersed species such as aspen. Aspen successfully established in burned areas far from seed sources, so managers may choose to focus attention on other species in postburn reforestation.
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Restoration of severely burned forest lands is limited in the southwestern US primarily due to a lack of research and resources. For those areas that have been reforested, there has been little success with an average of only 20% survival of planted seedlings. Major limitations to the establishment of tree seedlings are exposure to harsh abiotic factors, poor soil conditions such as reduced water holding capacities and fertility, animal damage, and competing vegetation, all of which limit basic physiological and growth processes in plants. However, there are different approaches, both in forest tree nursery production and during active reforestation planting operations, that could remediate one or more of these limitations. Success for any forest planting effort begins with the “Target Plant Concept” (TPC), which is defined as those morphological and physiological attributes of a nursery grown plant that will result in successful establishment and productivity on specific outplanting sites, such as the harsh, dry environments of the Southwest. This concept is the basis for all research conducted at the John T. Harrington Forestry Research Center with New Mexico State University.
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This study informs researchers and practitioners seeking to optimize terrestrial laser scanning (TLS) sampling methods for vegetation monitoring in dryland ecosystems through three analyses. First, we quantify the 2D extent of occluded regions based on the range from single scan positions. Second, we measure the efficacy of additional scan positions on the reduction of 2D occluded regions (area) using progressive configurations of scan positions in 1 ha plots. Third, we test the reproducibility of 3D sampling yielded by a 5-scan/ha sampling methodology using redundant sets of scans. Analyses were performed using measurements at analysis scales of 5 to 50 cm across the 1-ha plots, and we considered plots in grass and shrub-dominated communities separately.
This webinar focuses on LANDFIRE Remap products in the Southwest U.S., with specific emphasis on California applications. Presenters Jim Smith and Kori Blankenship will review improvements to LF’s newest product offering and look at what remains the same as previous versions. LF Remap products are being released through 2019-2020, as determined by LF GeoArea.
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The purpose of this analysis was to evaluate the number of federal oil and gas leases issued and number of APD issued between 2015 and 2019 that occurred within BLM-designated sage-grouse habitat (General and Priority Habitats). More specifically, our objective was to evaluate the differences in the number and acreage of federal oil and gas leases and number of APDs assigned inside and outside of BLM-designated sage-grouse habitat from October 1, 2015 to March 15, 2019.
Meeting webpage.
The 2023 Winter Meeting, hosted by Wyoming Gov. Mark Gordon, will feature the Western Governors and their special guests in public conversations about the most significant issues facing the region. It will be in Jackson Hole, WY.
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Chemical herbicides increased soil mineral nitrogen in proportion to their negative effects on plant cover for 2 years after treatments in all sites and increased soil water and net N mineralization (measured at one site) but did not affect total carbon, nitrogen, or organic matter. Invertebrate responses to herbicides varied by site, and invertebrates increased with chemical herbicides at the highest, wettest site. We show that herbicide treatments can exacerbate pulses of mineral nutrients, which previous studies have shown can weaken ecosystem resistance to invasion. Thus, restoration strategies that increase the likelihood that desired plants can capture mineralized nutrients after herbicide application will likely be more successful.
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A new Special Section in the journal BioScience provides an in-depth exposition of the Resist-Accept-Direct framework, a new approach to guide natural resource decision making. Articles in the Special Section explore the practical application of the framework, compatibility of existing tools, social barriers and opportunities, and future science needs.