Browsing by Subject "Bioenergy"

Now showing 1 - 3 of 3
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    Coarse Woody Debris in a Loblolly Pine Plantation Managed for Biofuel Production
    (2010-12-10) Beauvais, Christopher
    Weyerhaeuser Company has initiated a long-term study investigating the sustainability effects of managing biomass for biofuels production in an existing 200-acre loblolly pine (Pinus taeda) plantation in Lenoir County, NC. As part of this comprehensive study, Weyerhaeuser contracted researchers from Duke University to design and carry out a study of the effects of harvest and site preparation methods on coarse woody debris (CWD) within the research area. The purpose of this study is to estimate the amount of CWD biomass, carbon, and nitrogen removed by each treatment method to establish baseline data as future growth trends are analyzed.
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    Growth and physiological responses of isohydric and anisohydric poplars to drought.
    (J Exp Bot, 2015-07) Attia, Ziv; Domec, Jean-Christophe; Oren, Ram; Way, Danielle A; Moshelion, Menachem
    Understanding how different plants prioritize carbon gain and drought vulnerability under a variable water supply is important for predicting which trees will maximize woody biomass production under different environmental conditions. Here, Populus balsamifera (BS, isohydric genotype), P. simonii (SI, previously uncharacterized stomatal behaviour), and their cross, P. balsamifera x simonii (BSxSI, anisohydric genotype) were studied to assess the physiological basis for biomass accumulation and water-use efficiency across a range of water availabilities. Under ample water, whole plant stomatal conductance (gs), transpiration (E), and growth rates were higher in anisohydric genotypes (SI and BSxSI) than in isohydric poplars (BS). Under drought, all genotypes regulated the leaf to stem water potential gradient via changes in gs, synchronizing leaf hydraulic conductance (Kleaf) and E: isohydric plants reduced Kleaf, gs, and E, whereas anisohydric genotypes maintained high Kleaf and E, which reduced both leaf and stem water potentials. Nevertheless, SI poplars reduced their plant hydraulic conductance (Kplant) during water stress and, unlike, BSxSI plants, recovered rapidly from drought. Low gs of the isohydric BS under drought reduced CO2 assimilation rates and biomass potential under moderate water stress. While anisohydric genotypes had the fastest growth under ample water and higher photosynthetic rates under increasing water stress, isohydric poplars had higher water-use efficiency. Overall, the results indicate three strategies for how closely related biomass species deal with water stress: survival-isohydric (BS), sensitive-anisohydric (BSxSI), and resilience-anisohydric (SI). Implications for woody biomass growth, water-use efficiency, and survival under variable environmental conditions are discussed.
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    Public perception of bioenergy in North Carolina and Tennessee
    (Energy, Sustainability and Society, 2016-12) Radics, RI; Dasmohapatra, S; Kelley, SS
    © 2016, The Author(s). Background: The goal of the study is to examine the general public’s understanding and perceptions of bioenergy and biofuels in North Carolina (NC) and Tennessee (TN). The study focuses on the public concerns, support and risk evaluations of alternative bioenergy feedstocks and biofuels, and includes an assessment of the economic, environmental, social, and policy impacts of bioenergy production and use. Methods: A sample of consumers in NC and TN were surveyed in the fall of 2013 and spring of 2014 for their perceptions about bioenergy and specifically, biofuels for transportation. Five hundred eighty-six consumers completed the questionnaire electronically (376 in NC and 210 in TN). Results: Respondents reported that the price and vehicle compatibility with biomass-based transportation fuels were the most important factors in their choice of biofuels over gasoline at a pump. Results show that the acceptance of bioenergy depends on the extent of knowledge and available information to consumers about the energy source. A principal component analysis (PCA) indicated seven distinct dimensions of consumer’s perception about bioenergy. The key dimensions are the following: how bioenergy benefits the society, risks of bioenergy use, government support for bioenergy, increase in food cost, conditional use of trees, support for low-cost biofuel alternative to current energy, and market attributes of bioenergy purchase. Conclusions: The findings from this study reflect the need for communicating the benefits and risks from the use of bioenergy to the general public through trustworthy channels of communication and targeted policy, market, and institutional support.