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Academic literature on the topic 'Forest productivity – Oregon – H.J. Andrews Experimental Forest'
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Journal articles on the topic "Forest productivity – Oregon – H.J. Andrews Experimental Forest"
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Jonsson, Bengt Gunnar. "Riparian Bryophytes of the H. J. Andrews Experimental Forest in the Western Cascades, Oregon." Bryologist 99, no. 2 (1996): 226. http://dx.doi.org/10.2307/3244554.
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Schowalter, T. D. "Canopy arthropod community structure and herbivory in old-growth and regenerating forests in western Oregon." Canadian Journal of Forest Research 19, no. 3 (March 1, 1989): 318–22. http://dx.doi.org/10.1139/x89-047.
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This paper describes differences in canopy arthropod community structure and herbivory between old-growth and regenerating coniferous forests at the H. J. Andrews Experimental Forest in western Oregon. Species diversity and functional diversity were much higher in canopies of old-growth trees compared with those of young trees. Aphid bio-mass in young stands was elevated an order of magnitude over biomass in old-growth stands. This study indicated a shift in the defoliator/sap-sucker ratio resulting from forest conversion, as have earlier studies at Coweeta Hydrologic Laboratory, North Carolina. These data indicated that the taxonomically distinct western coniferous and eastern deciduous forests show similar trends in functional organization of their canopy arthropod communities.
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Parendes, Laurie A., and Julia A. Jones. "Role of Light Availability and Dispersal in Exotic Plant Invasion along Roads and Streams in the H. J. Andrews Experimental Forest, Oregon." Conservation Biology 14, no. 1 (February 2000): 64–75. http://dx.doi.org/10.1046/j.1523-1739.2000.99089.x.
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Ward, Adam S., Jay P. Zarnetske, Viktor Baranov, Phillip J. Blaen, Nicolai Brekenfeld, Rosalie Chu, Romain Derelle, et al. "Co-located contemporaneous mapping of morphological, hydrological, chemical, and biological conditions in a 5th-order mountain stream network, Oregon, USA." Earth System Science Data 11, no. 4 (October 22, 2019): 1567–81. http://dx.doi.org/10.5194/essd-11-1567-2019.
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Abstract. A comprehensive set of measurements and calculated metrics describing physical, chemical, and biological conditions in the river corridor is presented. These data were collected in a catchment-wide, synoptic campaign in the H. J. Andrews Experimental Forest (Cascade Mountains, Oregon, USA) in summer 2016 during low-discharge conditions. Extensive characterization of 62 sites including surface water, hyporheic water, and streambed sediment was conducted spanning 1st- through 5th-order reaches in the river network. The objective of the sample design and data acquisition was to generate a novel data set to support scaling of river corridor processes across varying flows and morphologic forms present in a river network. The data are available at https://doi.org/10.4211/hs.f4484e0703f743c696c2e1f209abb842 (Ward, 2019).
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Martin, C. Wayne, and R. Dennis Harr. "Logging of mature Douglas-fir in western Oregon has little effect on nutrient output budgets." Canadian Journal of Forest Research 19, no. 1 (January 1, 1989): 35–43. http://dx.doi.org/10.1139/x89-005.
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Precipitation and streamwater quantity have been sampled continuously on three adjacent watersheds since 1964 at the H. J. Andrews Experimental Forest on the western slopes of the Cascade Mountains of Oregon. The chemistry of streamwater has been sampled since 1972, and the chemistry of precipitation since 1973. These watersheds were covered primarily by a mature 130-year-old forest of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco). In 1974, one of the watersheds was clear-cut, the logs being removed primarily by a high-lead cable system. At the same time, 60% of the basal area was removed in a shelterwood cut from the adjoining watershed. The third watershed remained uncut for reference. Both harvested watersheds were broadcast burned in 1975 and planted to Douglas-fir in 1976. Streamwater chemistry data and input–output budgets for the three watersheds are presented for 10 years after cutting. Nitrate nitrogen was the only measured solute affected by logging. Despite a 30-fold increase, nitrate nitrogen concentrations were so low that more than twice as much nitrate nitrogen was added to the clearcut from precipitation as was lost in streamwater.
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Mintie, A. T., R. S. Heichen, K. Cromack,, D. D. Myrold, and P. J. Bottomley. "Ammonia-Oxidizing Bacteria along Meadow-to-Forest Transects in the Oregon Cascade Mountains." Applied and Environmental Microbiology 69, no. 6 (June 2003): 3129–36. http://dx.doi.org/10.1128/aem.69.6.3129-3136.2003.
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ABSTRACT Although nitrification has been well studied in coniferous forests of Western North America, communities of NH3-oxidizing bacteria in these forests have not been characterized. Studies were conducted along meadow-to-forest transects at two sites (Lookout and Carpenter) in the H. J. Andrews Experimental Forest, located in the Cascade Mountains of Oregon. Soil samples taken at 10- or 20-m intervals along the transects showed that several soil properties, including net nitrogen mineralization and nitrification potential rates changed significantly between vegetation zones. Nonetheless, terminal restriction fragment length polymorphism (T-RFLP) analysis of the PCR-amplified NH3 monooxygenase subunit A gene (amoA) showed the same DNA fragments (TaqI [283 bp], CfoI [66 bp], and AluI [392 bp]) to dominate ≥45 of 47 soil samples recovered from both sites. Two fragments (491-bp AluI [AluI491] and CfoI135) were found more frequently in meadow and transition zone soil samples than in forest samples at both sites. At the Lookout site the combination AluI491-CfoI135 was found primarily in meadow samples expressing the highest N mineralization rates. Four unique amoA sequences were identified among 15 isolates recovered into pure culture from various transect locations. Six isolates possessed the most common T-RFLP amoA fingerprint of the soil samples (TaqI283-AluI392-CfoI66), and their amoA sequences shared 99.8% similarity with a cultured species, Nitrosospira sp. strain Ka4 (cluster 4). The other three amoA sequences were most similar to sequences of Nitrosospira sp. strain Nsp1 and Nitrosospira briensis (cluster 3). 16S ribosomal DNA sequence analysis confirmed the affiliation of these isolates with Nitrosospira clusters 3 and 4. Two amoA clone sequences matched T-RFLP fingerprints found in soil, but they were not found among the isolates.
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Rich, J. J., R. S. Heichen, P. J. Bottomley, K. Cromack, and D. D. Myrold. "Community Composition and Functioning of Denitrifying Bacteria from Adjacent Meadow and Forest Soils." Applied and Environmental Microbiology 69, no. 10 (October 2003): 5974–82. http://dx.doi.org/10.1128/aem.69.10.5974-5982.2003.
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ABSTRACT We investigated communities of denitrifying bacteria from adjacent meadow and forest soils. Our objectives were to explore spatial gradients in denitrifier communities from meadow to forest, examine whether community composition was related to ecological properties (such as vegetation type and process rates), and determine phylogenetic relationships among denitrifiers. nosZ, a key gene in the denitrification pathway for nitrous oxide reductase, served as a marker for denitrifying bacteria. Denitrifying enzyme activity (DEA) was measured as a proxy for function. Other variables, such as nitrification potential and soil C/N ratio, were also measured. Soil samples were taken along transects that spanned meadow-forest boundaries at two sites in the H. J. Andrews Experimental Forest in the Western Cascade Mountains of Oregon. Results indicated strong functional and structural community differences between the meadow and forest soils. Levels of DEA were an order of magnitude higher in the meadow soils. Denitrifying community composition was related to process rates and vegetation type as determined on the basis of multivariate analyses of nosZ terminal restriction fragment length polymorphism profiles. Denitrifier communities formed distinct groups according to vegetation type and site. Screening 225 nosZ clones yielded 47 unique denitrifying genotypes; the most dominant genotype occurred 31 times, and half the genotypes occurred once. Several dominant and less-dominant denitrifying genotypes were more characteristic of either meadow or forest soils. The majority of nosZ fragments sequenced from meadow or forest soils were most similar to nosZ from the Rhizobiaceae group in α-Proteobacteria species. Denitrifying community composition, as well as environmental factors, may contribute to the variability of denitrification rates in these systems.
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van Verseveld, Willem J., Holly R. Barnard, Chris B. Graham, Jeffrey J. McDonnell, J. Renée Brooks, and Markus Weiler. "A sprinkling experiment to quantify celerity–velocity differences at the hillslope scale." Hydrology and Earth System Sciences 21, no. 11 (November 27, 2017): 5891–910. http://dx.doi.org/10.5194/hess-21-5891-2017.
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Abstract. Few studies have quantified the differences between celerity and velocity of hillslope water flow and explained the processes that control these differences. Here, we asses these differences by combining a 24-day hillslope sprinkling experiment with a spatially explicit hydrologic model analysis. We focused our work on Watershed 10 at the H. J. Andrews Experimental Forest in western Oregon. Celerities estimated from wetting front arrival times were generally much faster than average vertical velocities of δ2H. In the model analysis, this was consistent with an identifiable effective porosity (fraction of total porosity available for mass transfer) parameter, indicating that subsurface mixing was controlled by an immobile soil fraction, resulting in the attenuation of the δ2H input signal in lateral subsurface flow. In addition to the immobile soil fraction, exfiltrating deep groundwater that mixed with lateral subsurface flow captured at the experimental hillslope trench caused further reduction in the δ2H input signal. Finally, our results suggest that soil depth variability played a significant role in the celerity–velocity responses. Deeper upslope soils damped the δ2H input signal, while a shallow soil near the trench controlled the δ2H peak in lateral subsurface flow response. Simulated exit time and residence time distributions with our hillslope hydrologic model showed that water captured at the trench did not represent the entire modeled hillslope domain; the exit time distribution for lateral subsurface flow captured at the trench showed more early time weighting.
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Daly, Christopher, Jonathan W. Smith, Joseph I. Smith, and Robert B. McKane. "High-Resolution Spatial Modeling of Daily Weather Elements for a Catchment in the Oregon Cascade Mountains, United States." Journal of Applied Meteorology and Climatology 46, no. 10 (October 1, 2007): 1565–86. http://dx.doi.org/10.1175/jam2548.1.
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Abstract High-quality, daily meteorological data at high spatial resolution are essential for a variety of hydrologic and ecological modeling applications that support environmental risk assessments and decision making. This paper describes the development, application, and assessment of methods to construct daily high-resolution (∼50-m cell size) meteorological grids for the 2003 calendar year in the Upper South Santiam Watershed (USSW), a 500-km2 mountainous catchment draining the western slope of the Oregon Cascade Mountains. Elevations within the USSW ranged from 194 to 1650 m. Meteorological elements modeled were minimum and maximum temperature; total precipitation, rainfall, and snowfall; and solar radiation and radiation-adjusted maximum temperature. The Parameter–Elevation Regressions on Independent Slopes Model (PRISM) was used to interpolate minimum and maximum temperature and precipitation. The separation of precipitation into rainfall and snowfall components used a temperature-based regression function. Solar radiation was simulated with the Image-Processing Workbench. Radiation-based adjustments to maximum temperature employed equations developed from data in the nearby H. J. Andrews Experimental Forest. The restrictive terrain of the USSW promoted cold-air drainage and temperature inversions by reducing large-scale airflow. Inversions were prominent nearly all year for minimum temperature and were noticeable even for maximum temperature during the autumn and winter. Precipitation generally increased with elevation over the USSW. In 2003, precipitation was nearly always in the form of rain at the lowest elevations but was about 50% snow at the highest elevations. Solar radiation followed a complex pattern related to terrain slope, aspect, and position relative to other terrain features. Clear, sunny days with a large proportion of direct radiation exhibited the greatest contrast in radiation totals, whereas cloudy days with primarily diffuse radiation showed little contrast. Radiation-adjusted maximum temperatures showed similar patterns. The lack of a high-quality observed dataset was a major issue in the interpolation of precipitation and solar radiation. However, observed data available for the USSW were superior to those available for most mountainous regions in the western United States. In this sense, the methods and results presented here can inform others performing similar studies in other mountainous regions.
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Ward, Adam S., Steven M. Wondzell, Noah M. Schmadel, Skuyler Herzog, Jay P. Zarnetske, Viktor Baranov, Phillip J. Blaen, et al. "Spatial and temporal variation in river corridor exchange across a 5th-order mountain stream network." Hydrology and Earth System Sciences 23, no. 12 (December 20, 2019): 5199–225. http://dx.doi.org/10.5194/hess-23-5199-2019.
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Abstract. Although most field and modeling studies of river corridor exchange have been conducted at scales ranging from tens to hundreds of meters, results of these studies are used to predict their ecological and hydrological influences at the scale of river networks. Further complicating prediction, exchanges are expected to vary with hydrologic forcing and the local geomorphic setting. While we desire predictive power, we lack a complete spatiotemporal relationship relating discharge to the variation in geologic setting and hydrologic forcing that is expected across a river basin. Indeed, the conceptual model of Wondzell (2011) predicts systematic variation in river corridor exchange as a function of (1) variation in baseflow over time at a fixed location, (2) variation in discharge with location in the river network, and (3) local geomorphic setting. To test this conceptual model we conducted more than 60 solute tracer studies including a synoptic campaign in the 5th-order river network of the H. J. Andrews Experimental Forest (Oregon, USA) and replicate-in-time experiments in four watersheds. We interpret the data using a series of metrics describing river corridor exchange and solute transport, testing for consistent direction and magnitude of relationships relating these metrics to discharge and local geomorphic setting. We confirmed systematic decrease in river corridor exchange space through the river networks, from headwaters to the larger main stem. However, we did not find systematic variation with changes in discharge through time or with local geomorphic setting. While interpretation of our results is complicated by problems with the analytical methods, the results are sufficiently robust for us to conclude that space-for-time and time-for-space substitutions are not appropriate in our study system. Finally, we suggest two strategies that will improve the interpretability of tracer test results and help the hyporheic community develop robust datasets that will enable comparisons across multiple sites and/or discharge conditions.
Books on the topic "Forest productivity – Oregon – H.J. Andrews Experimental Forest"
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Luoma, Daniel L. Biomass and community structure of sporocarps formed by hypogeous ectomycorrhizal fungi within selected forest habitats of the H. J. Andrews Experimental Forest, Oregon. 1988.
Find full textBook chapters on the topic "Forest productivity – Oregon – H.J. Andrews Experimental Forest"
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Farnsworth, John Seibert. "Notes from the H. J. Andrews Experimental Forest." In Nature beyond Solitude, 115–48. Cornell University Press, 2020. http://dx.doi.org/10.7591/cornell/9781501747281.003.0004.
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This chapter details the author's field notes from the H. J. Andrews Experimental Forest. The author was awarded a two-week residency in the forest through the Spring Creek Project, which is administered through Oregon State University. The project began in 2003 and will continue until 2203, fully funded. The mission is to keep a “Forest Log” of ecological reflections for two centuries. The chapter then recounts the author's identification of the trees and plants. The trees include Douglas-firs, western hemlock, western red cedars, and Pacific silver firs. Meanwhile, the plants include the Low Oregon grape, trillium, and Linnaea borealis, better known as “twinflower.” However, there were no blooms to speak of at the end of October.
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Swanson, Frederick J. "Science, Citizenship, and Humanities in the Ancient Forest of H. J. Andrews." In Long-Term Ecological Research. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199380213.003.0012.
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The H. J. Andrews Experimental Forest Long-Term Ecological Research (LTER) program has nurtured a large, highly interdisciplinary community that has been a wonderful seedbed for emergence of ideas from our group, and for my own growth as a scientist, educator, collaborator, and communicator. Collaborations for me as an individual and within the Andrews forest group have grown over the decades: research–land management since the 1950s, ecology–earth sciences since the early 1970s, biophysical sciences–social sciences since the early 1990s, and humanities–arts–sciences over the past dozen years. As a US Forest Service scientist in seamless collaboration with academic and land manager colleagues, the stable yet dynamic community that the LTER program fosters has served as a great platform for connecting science lessons with society through many means, ranging from development of regional conservation strategies and landscape management plans to storytelling. This is a practice of citizenship by individual scientists and by a science-based team. The sustained learning that the LTER program has underwritten gives scientists a foundation for communicating findings from science and discussing their implications with the public, and the forest itself is a great stage for these conversations. I have had a career of immersion in the International Biological Program (IBP) and in the LTER program since its inception. After completing graduate studies in geology in 1972, I had the good fortune to join the early stages of IBP in the Coniferous Forest Biome Project at the H. J. Andrews Experimental Forest (AND) in the Cascade Range of Oregon. Our team of forest and stream ecologists, and a few earth scientists, had the decade of the 1970s to coalesce, mature, and craft stories of the ecosystems of the Pacific Northwest. The Andrews forest was a wonderful place to do that. It has a complex, ancient forest with nearly 100-m tall trees and fast, cold, clear, mountain streams whose beauty and chill takes your breath away. The year 1980 was pivotal for the group in three ways. First, Jerry Franklin led a synthesis of our team’s knowledge of old-growth forests, which set the stage for major transformation in public perception and policy toward federal forests a decade later and, incidentally, changed our lives.
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Johnson, Sherri L. "Streams and Dreams and Cross-site Studies." In Long-Term Ecological Research. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199380213.003.0010.
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The influence of the Long-Term Ecological Research (LTER) program on my science has been to broaden my scope through exposure to long-term research and to encourage me to explore major questions across biomes. Communication and outreach with natural resource managers and policy makers has given me insight into translation of science and shaped my research. Through my experiences in the LTER program, I began collaborations with stream ecologists and biogeochemists across sites, which expanded into a high-profile research project that spanned several decades. I encourage scientists to work at LTER sites because they are supportive science communities with a wealth of information to share. Currently, I am a co–principal investigator at the H. J. Andrews Experimental Forest LTER project (AND) in Oregon and have been involved with LTER sites most of my professional life. In 1990, I began graduate research on freshwater shrimp responses to a hurricane at the Luquillo LTER site (LUQ) with Alan Covich, my PhD advisor at the University of Oklahoma. My involvement with LTER research expanded during my postdoctoral fellowship. Through the LTER All Scientists Meetings, I met Julia Jones and other researchers from AND. With their encouragement, I received a National Science Foundation (NSF) Postdoctoral Fellowship Grant in 1996 to examine stream temperature dynamics at AND. After several years at Oregon State University, I was hired by the US Forest Service (USFS) Pacific Northwest Research Station in 2001 as a USFS scientist for AND and became a co–principal investigator in 2002. I have had the benefit of being mentored for multiple years by Fred Swanson and have gradually assumed lead USFS responsibilities for AND. As a stream ecologist, I have studied basic questions and applied issues involving water quality, water quantity, and stream food webs, primarily in forested streams. My research at the LUQ site has examined responses of fresh water shrimp to disturbances and their role in ecosystem dynamics. At AND, my research exploring patterns and controls of stream temperature began as a theoretical landscape-scale question and expanded to examination of temperature responses to flow paths, calculations of heat budgets, and policy implications of forest management (Johnson and Jones 2000; Johnson 2004).