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Filtering by: Creator Boyd, O. Sierra Remove constraint Creator: Boyd, O. Sierra Academic Affiliation Forest Ecosystems and Society Remove constraint Academic Affiliation: Forest Ecosystems and Society

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  • Environmental variability and system heterogeneity in terrestrial biogeochemical models

    Creator:
    Sierra, Carlos Alberto
    Abstract:
    Ecosystems are highly heterogeneous systems subjected to important levels of environmental variability; however, it is common in terrestrial biogeochemical models to assume homogeneous properties of the elements of the system or constant environmental conditions. For some processes, heterogeneity in these models is treated very simplistically, but there is not much...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Carlos A. Sierra for the

  • Assessment and Recommendations for Interpretive Programming around Climate Change at the Glades Wildlife Refuge

    Creator:
    Boyd, Kelsey
    Abstract:
    This paper identifies 51 best practices of interpretive programming in relation to the topic of climate change and applies those practices to interpretive programs delivered by Natural Lands, a Pennsylvania environmental non-profit organization, and specifically at the Glades Wildlife Refuge, one of Natural Lands’ nature preserves. The best practices are...
    Resource Type:
    Capstone Project
    Full Text:
    Interpretive Programming around Climate Change at the Glades Wildlife Refuge by Kelsey Boyd

  • Decomposition of heterogeneous organic matter and its long-term stabilization in soils

    Creator:
    Sierra, Carlos A., Harmon, Mark E., and Perakis, Steven S.
    Abstract:
    Soil organic matter is a complex mixture of material with heterogeneous biological, physical, and chemical properties. Decomposition models represent this heterogeneity either as a set of discrete pools with different residence times or as a continuum of qualities. It is unclear though, whether these two different approaches yield comparable predictions...
    Resource Type:
    Article
    Full Text:
    its long-term stabilization in soils CARLOS A. SIERRA,1,2,4 MARK E. HARMON,1 AND STEVEN S. PERAKIS3

  • Wicked Water Problems for South-Central Texas

    Creator:
    Doty, Brent R.
    Abstract:
    Like many areas around the globe experiencing ever-growing demand for diminishing natural resources, the south-central region of Texas is facing a wicked problem in water resource planning and sustainability. This Region includes San Antonio, the seventh largest city in the U.S. With a projected population increase over one million residents...
    Resource Type:
    Capstone Project
    Full Text:
    dependence on the Edwards Aquifer continued unchallenged until 1991 when the Sierra Club filed suit against

  • Impacts of dwarf mistletoe on the physiology of host Tsuga heterophylla trees as recorded in tree ring C and O stable isotopes

    Creator:
    Marias, Danielle E.
    Abstract:
    Dwarf mistletoes, obligate, parasitic plants with diminutive aerial shoots, have long-term effects on host tree water relations, hydraulic architecture, and photosynthetic gas exchange and can eventually lead to tree death. To investigate the long-term impacts of dwarf mistletoe on gas exchange of host western hemlock trees, I compared growth, gas...
    Resource Type:
    Masters Thesis
    Full Text:
    Host Tsuga heterophylla Trees as Recorded in Tree Ring C and O Stable Isotopes Abstract

  • Simulated response of ecosystem processes to climate change in northern California and western Nevada

    Creator:
    McGlinchy, Maureen C.
    Abstract:
    In order to investigate potential climate impacts on landscape-scale ecosystem processes, I implemented a dynamic general vegetation model (DGVM) over a large domain in northern California and western Nevada on a rectangular grid of ca. 800-meter spatial resolution. I used 100 years of observed, monthly climate and nine future climate...
    Resource Type:
    Masters Thesis
    Full Text:
    overestimated annual production in the Sierra Nevada and Klamath Mountains and underestimated it in the

  • Spatial and ecological analysis of red fir decline in California using FIA data

    Creator:
    Mortenson, Leif A.
    Abstract:
    Red fir (Abies magnifica) is a high elevation conifer generally growing between an altitude of 1,400 and 2,700 meters. In California, red fir grows in the Sierra Nevada, the Klamath Mountains, the eastern edges of the northern Californian Coast Ranges, and in the southern Cascades. Red fir commonly grows in...
    Resource Type:
    Masters Thesis
    Full Text:
    in the Sierra Nevada, the Klamath Mountains, the eastern edges of the northern Californian Coast

  • Long and Short-Term Effects of Fire on Soil Charcoal of a Conifer Forest in Southwest Oregon

    Creator:
    Pingree, Melissa R. A., Homann, Peter S., Morrissette, Brett, and Darbyshire, Robyn
    Abstract:
    In 2002, the Biscuit Wildfire burned a portion of the previously established, replicated conifer unthinned and thinned experimental units of the Siskiyou Long-Term Ecosystem Productivity (LTEP) experiment, southwest Oregon. Charcoal C in pre and post-fire O horizon and mineral soil was quantified by physical separation and a peroxide-acid digestion method....
    Resource Type:
    Article
    Full Text:
    Productivity (LTEP) experiment, southwest Oregon. Charcoal C in pre and post-fire O horizon and mineral soil

  • Banks, Gardens and Bees: Enhancing Community Resilience in West Africa

    Creator:
    Polasky, Sophia
    Abstract:
    International development programs are often implemented with the goal of building community resilience, but without a clear articulation of how this goal will be met, or any consideration of if or why the effort was successful after it has concluded. This thesis considers three different activities implemented by the U....
    Resource Type:
    Masters Thesis
    Full Text:
    community resilience in Sierra Leone, Guinea, and Côte d’Ivoire. Activities considered include: the

  • Ecological Forestry : A Critical Analysis

    Creator:
    Batavia, Chelsea
    Abstract:
    Although science is widely accepted as a fundamental source of information underlying decisions about forest management and conservation, considerably less attention has been paid to the inevitable role that normative values and beliefs play in such decisions. This thesis highlights the normative dimensions of "ecological forestry," a strategy of forest...
    Resource Type:
    Masters Thesis
    Full Text:
    . current proposals to use ecological forestry to manage the O&C lands in western  Oregon,   without