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145 results for “Aspen”
Tree ring, leaf mining, climate, and remote sensing data from aspen leaf miner survey sites: II - Tree DBH and age
This dataset contiains tree level measurements of diameter at breast height (DBH) and age of aspen that were sampled in 2015 for tree ring anlyses. The tree ages provided are the age of the tree in 2015.
Annual aspen growth (basal area increment; BAI) of 84 aspen that were alive and 76 that were dead when sampled in 2016 from 22 plots (eight sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI)
This dataset contains basal area increment (BAI) chronologies of 84 aspen the were alive and 76 that were dead in 2016. Live trees were cored and dead trees felled in 2016 across 22 plots (eight sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI). Chronologies of BAI extend as far back as 1901 and up to 2015.
Tree characteristics of 84 aspen that were alive and 76 that were dead when sampled in 2016 from 22 plots (8 sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI)
This dataset contains diameter at breast height (DBH) in 2016 and 1997, canopy position in 2016, last year of full growth, year of death, year established, age at last year of full growth, and age at year of death of 84 aspen that were alive and 76 that were dead in 2016 from 22 plots (8 sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI).
Aspen litterfall data for Mountain Research Station, Como Creek, and C1, 1996 - 1999.
This measurement was established in summer 1996, in response to the observation by Mark Losleben that the aspen foliage dynamics appeared to exhibit a very sensitive response to climate, particularly duration of snowpack. Aspen production, as indexed by litterfall, was suggested to be an important integrator andgor response function to climatic variability. Also, these data provide a minimum estimate of aboveground NPP of aspen stands in the Colorado Front Range, a data set of interest in relation to similar measurements obtained for the alpine tundra above these sites. NOTE: The LTER data portal display does not display important maintenance/log information or other EML metadata features. Please be sure to view the EML file (a text file that contains XML tags) which is included in the zip archive (click on "Download zip archive") pertaining to each dataset. The EML file name will have the following format: knb-lter-nwt.[3 digit dataset number].[version number].xml. Most web browsers can parse the EML so it's easier to read.
Litter Fall Collection Study in Pinyon-Juniper, Cottowood, and Spruce-Fir-Aspen Forests at the Sevilleta NWR, Bosque del Apache NWR, and the Cibola National Forest, New Mexico (1992-1993)
The litterfall study was designed to assess the quantity of biomass (leaves, twigs, reproductive materials) falling from tree species in different ecosystem types. Three study sites selected were:  (1) the pinyon-juniper woodland site near Cerro Montoso on the Sevilleta NWR; (2) the cottonwood forest LTER site along the Rio Grande at Bosque del Apache NWR; and (2) the old-growth spruce-fir-aspen site near South Baldy in the Magdalena Mountains (Cibola National Forest).  The study was conducted over two years (1992-1993) to compare litterfall rates and quantities among sites, seasons and years.
Fungal OTUs during dead wood succession of aspen
<p class="MsoPlainText">During decomposition of organic matter, microbial communities may follow different successional trajectories depending on the initial environment and colonizers. The timing and order of the assembly history can lead to divergent communities through priority effects. We explored how assembly history and substrate quality affected fungal dead wood communities and decomposition, 1.5 and 4.5 years after tree felling. In addition, we investigated the effect of invertebrate exclusion during the first two summers. For aspen (<i>Populus tremula</i>) logs, we measured initial bark and wood resource quality, and surveyed the fungal communities by DNA metabarcoding at different time points during succession. We found that a gradient in fungal community composition was related to resource quality and we discuss how this may reflect tolerance-dominance trade-offs in fungal life history strategies. As with previous studies, the initial amount of bark tannins was negatively correlated with wood decomposition rate over 4.5 years. The latent fungal community explained variation in community composition after 1.5, but not after 4.5 years, of succession. Although the assembly history of latent fungi may cause alternate trajectories in successional communities, our results indicate that the communities may easily converge with the arrival of secondary colonizers. We also identified a strong invertebrate-induced priority effect of fungal communities, even after 4.5 years of succession, thereby adding crucial knowledge to the importance of invertebrates in affecting fungal community development. By measuring and manipulating aspects of assembly history and resource quality that have rarely been studied, we expand our understanding of the complexity of fungal community dynamics.</p>
Data from: Wildfire catalyzes upward range expansion of trembling aspen in southern Rocky Mountain beetle-killed forests
<p>In this study, we assessed whether recent wildfires and spruce beetle outbreaks promoted upward range expansion of trembling aspen (<i>Populus tremuloides</i>) in the San Juan Mountains of southern Colorado. We assessed aerial imagery for presence/absence of aspen in the study area and ground truthed a subset of these points to compare the aerial imagery analysis with field records of aspen. From these data we determined the upper elevational limit of aspen in the study area before fire. We then conducted field surveys at and above the upper elevational limit of aspen in burned and unburned, but beetle killed areas and collected data on stand structure, surface cover, seedling density and microsite conditions associated with seedlings. </p>
Re-assessment of the climatic controls on the carbon and water fluxes of a boreal aspen forest over 1996-2016: changing sensitivity to long-term climatic conditions
<p>Recent evidence suggests that the relationships between climate and boreal tree growth are generally non-stationary; however, it remains uncertain whether the relationships between climate and carbon (C) fluxes of boreal forests are stationary or have changed over recent decades. In this study, we used continuous eddy-covariance and microclimate data over 21 years (1996-2016) from a 100-year-old trembling aspen stand in central Saskatchewan, Canada to assess the relationships between climate and ecosystem C and water fluxes. Over the study period, the most striking climatic event was a severe, 3-year drought (2001-2003). Gross ecosystem production (GEP) showed larger interannual variability than ecosystem respiration (<em>R</em><sub>e</sub>) over 1996-2016, but <em>R</em><sub>e</sub> was the dominant component contributing to the interannual variation in net ecosystem production (NEP) during post-drought years. The inter-annual variations in evapotranspiration (ET) and C fluxes were primarily driven by temperature and secondarily by water availability. Two-factor linear models combining precipitation and temperature performed well in explaining the inter-annual variation in C and water fluxes (<em>R</em><sup>2</sup>>0.5). The temperature dependence of all three C fluxes (NEP, GEP and <em>R</em><sub>e</sub>) declined over 1996-2015 (<em>p</em><0.05), and as a result, the phenological controls on annual NEP weakened. The decreasing temperature sensitivity of the C fluxes over 1996-2015 may reflect changes in forest structure, related to the over-maturity of the aspen stand at 100-years of age and exacerbated by high tree mortality following the severe 2001-2003 drought. These results may provide an early warning signal of driver shift or even an abrupt status shift of aspen forest dynamics. They may also imply a universal weakening in the relationship between temperature and GEP as forests become over-mature, associated with the structural and compositional changes that accompany forest ageing.</p>
Intraspecific variation in plant economic traits predicts trembling aspen resistance to a generalist insect herbivore
<p>Patterns of trait expression within some plant species have recently been shown to follow patterns described by the leaf economics spectrum paradigm. Resistance to herbivores is also expected to covary with leaf economics traits. We selected multiple mature <em>Populus tremuloides</em> genotypes from a common garden to assess whether aspen leaf economics patterns follow those observed among species globally. We also evaluated leaf economics strategies in the context of insect resistance by conducting bioassays to determine the effects of plant traits on preference and performance of <em>Lymantria dispar. </em>We found that: 1) intraspecific trait patterns of <em>P. tremuloides</em> parallel those exhibited by the interspecific leaf economics spectrum, 2) herbivores preferred leaves from genotypes with resource-acquisitive strategies, and 3) herbivores also performed best on genotypes<em> </em>with resource-acquisitive strategies. We conclude that a leaf economics spectrum that incorporates defense traits is a useful tool for explaining intraspecific patterns of variation in plant strategies, including resistance to herbivores.</p>
A detailed flowsheet of a 100 MW Solid Oxide Fuel Cell plant modeled in ASPEN PLUS
<p>Files required for modeling a 100 MW Solid Oxide Fuel Cell Plant (Power-to-Gas Mode) in Aspen Plus. The plant was designed by Butera et al.[1]. A detailed capital cost estimate was made using the AspenTech Process Economic Analyzer and written in ESA.xlsx. </p> <p>Further details are available upon request: alexandru.botan@phystech.edu</p> <p>[1] Butera, G., Jensen, S.H., and Clausen, L.R. "A novel system for large-scale storage of electricity as synthetic natural gas" submitted to J. Energy</p> <p> </p> <p> </p>
Data for: Evaluating Golden-winged Warbler use of alder and aspen communities managed with shearing in the western Great Lakes
<p>Best management practices are often written by researchers to guide land managers and landowners in the creation of habitat for wildlife species of interest. These documents are based on research evaluating the habitat needs of a species, but also describe tools and strategies managers can implement to create or restore desired conditions. Shrub and sapling shearing is a management practice often used to improve habitat for early-successional species, yet little monitoring or research has focused on wildlife response to shearing. The goal of this research was to formally evaluate the effect of shrub and sapling shearing as a best management strategy for Golden-winged Warbler (<em>Vermivora</em> <em>chrysoptera</em>) conservation at a regional scale. Specifically, we surveyed for male Golden-winged Warblers during the breeding season in sheared sites and untreated reference sites across portions of the western Great Lakes to assess the effects of 1) management status (i.e., sheared aspen or alder vs un-treated sites), and 2) the patch-level vegetation characteristics on male abundance. We found that male Golden-winged Warbler abundance was twice as high in sheared sites than in mature reference sites and peaked when sapling cover was ~40%. Male abundance was also negatively associated with percent cover of forbs and non-vegetated ground. These findings highlight the importance of patch-level heterogeneity when implementing shearing treatments for Golden-winged Warblers, and demonstrate the potential need for pre-treatment site assessments to help focus conservation efforts for this species. Ultimately, our results support the use of a site-specific, nuanced approach to shearing implementation to maximize cost efficiency and desired species outcomes.</p>
Data from: Genomic and transcriptomic analyses reveal polygenic architecture for ecologically-important functional traits in aspen (Populus tremuloides Michx.)
<p>Intraspecific genetic variation in foundation species such as aspen (<em>Populus</em> <em>tremuloides</em> Michx.) shapes their impact on forest structure and function. Identifying genes underlying ecologically important traits is key to understanding that impact. Previous studies, using single-locus genome-wide association (GWA) analyses to identify candidate genes, have identified fewer genes than anticipated for highly heritable quantitative traits. Mounting evidence suggests that polygenic control of quantitative traits is largely responsible for this "missing heritability" phenomenon. Our research characterized the genetic architecture of 30 ecologically important traits using a common garden of aspen through genomic and transcriptomic analyses. A multilocus association model revealed that most traits displayed a highly polygenic architecture, with most variation explained by loci with small effects (likely below the detection levels of single-locus GWA methods). Consistent with a polygenic architecture, our single-locus GWA analyses found only 38 significant SNPs in 22 genes across 15 traits. Next, we used differential expression analysis on a subset of aspen genets with divergent concentrations of salicinoid phenolic glycosides (key defense traits). This complementary method to traditional GWA discovered 1,243 differentially expressed genes for a polygenic trait. Soft clustering analysis revealed three gene clusters (241 candidate genes) involved in secondary metabolite biosynthesis and regulation. Our work reveals that ecologically important traits governing higher-order community- and ecosystem-level attributes of a foundation forest tree species have complex underlying genetic structures and will require methods beyond traditional GWA analyses to unravel.</p>
Data from: The primacy of density-mediated indirect effects in a community of wolves, elk, and aspen
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Intraspecific variation in plant economic traits predicts trembling aspen resistance to a generalist insect herbivore
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Canopy insect communities are shaped by the genes and phenotypes of their aspen hosts
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Data from: Genomic and transcriptomic analyses reveal polygenic architecture for ecologically-important functional traits in aspen (Populus tremuloides Michx.)
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Re-assessment of the climatic controls on the carbon and water fluxes of a boreal aspen forest over 1996-2016: changing sensitivity to long-term climatic conditions
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Data from: Wildfire catalyzes upward range expansion of trembling aspen in southern Rocky Mountain beetle-killed forests
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Data for: Evaluating Golden-winged Warbler use of alder and aspen communities managed with shearing in the western Great Lakes
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Data from: Contrasting effects of climate warming on hosts and parasitoids: Insights from Rocky Mountain aspen leaf miners and their parasitoids
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