924 resultados para Occupational and Environmental Medicine


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Includes bibliographical references and index.

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Spine title: 1989/1990 plan amendments and environmental assessment.

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"For use in conjunction with the proposed RMP"--P. [2] of cover, v. 1.

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Pt. 2 has subtitle: Hearings before the Committee on Energy and Natural Resources, United States Senate, One Hundredth Congress, first session, on the status of the Department of Energy's effects to address issues concerning the defense materials production reactors ... October 27 and 29, 1987.

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In boreal bogs plant species are low in number, but they differ greatly in their growth forms and photosynthetic properties. We assessed how ecosystem carbon (C) sink dynamics were affected by seasonal variations in photosynthetic rate and leaf area of different species. Photosynthetic properties (light-response parameters), leaf area development and areal cover (abundance) of the species were used to quantify species-specific net and gross photosynthesis rates (PN and PG, respectively), which were summed to express ecosystem-level PN and PG. The ecosystem-level PG was compared with a gross primary production (GPP) estimate derived from eddy covariance measurements (EC). Species areal cover rather than differences in photosynthetic properties determined the species with the highest PG of both vascular plants and Sphagna. Species-specific contributions to the ecosystem PG varied over the growing season, which in turn determined the seasonal variation in ecosystem PG. The upscaled growing-season PG estimate, 230 g C/m**2, agreed well with the GPP estimated by the EC, 243 g C/m**2. Sphagna were superior to vascular plants in ecosystem-level PG throughout the growing season but had a lower PN. PN results indicated that areal cover of the species together with their differences in photosynthetic parameters shape the ecosystem-level C balance. Species with low areal cover but high photosynthetic efficiency appear to be potentially important for the ecosystem C sink. Results imply that functional diversity may increase the stability of C sink of boreal bogs.

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Thesis (Master's)--University of Washington, 2016-06

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This Article does not have an abstract.