Download Analysis of Biogeochemical Cycling Processes in Walker by R. I. Van Hook (auth.), Dale W. Johnson, Robert I. Van Hook PDF

By R. I. Van Hook (auth.), Dale W. Johnson, Robert I. Van Hook (eds.)

The Oak Ridge nationwide Laboratory's Environmental Sciences department initiated the Walker department Watershed undertaking at the Oak Ridge Reservation in east Tennessee in 1967, with the aid of the U. S. division of Energy's workplace of wellbeing and fitness and Environmental learn (DOE/OHER), to quantify land-water interactions in a forested panorama. It used to be designed to target 3 central ambitions: (1) to improve baseline information on unpolluted ecosystems, (2) to give a contribution to our wisdom of biking and lack of chemical components in common ecosystems, and (3) to supply the knowledge beneficial for the development of mathe­ matical simulation types for predicting the results of man's actions on forested landscapes. In 1969, the overseas organic Program's jap Deciduous wooded area Biome undertaking used to be initiated, and Walker department Watershed used to be selected as among the websites for in depth study on nutrient biking and organic productiveness. This paintings used to be supported through the nationwide technological know-how origin (NSF). Over the subsequent four years, in depth process-level study on basic productiveness, decomposition, and belowground organic strategies was once coupled with ongoing DOE-supported paintings at the characterization of simple geology and hydrological cycles at the watershed. In 1974, the NSF's RANN application (Research utilized to nationwide wishes) begun paintings on hint point biking on Walker department Wa­ tershed as a result vast info base being built lower than either DOE and NSF support.

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Extra resources for Analysis of Biogeochemical Cycling Processes in Walker Branch Watershed

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B. Hicks, and P. Camara. 1987. A canopy stomatal resistance model for gaseous deposition to vegetated surfaces. Atmos. Environ. 21:91-101. site. Because of the role of plant water potential in establishing fs values, soil moisture availability is another edaphic condition requiring characterization for studies of forest meteorological phenomena involving exchanges of water or in which fs plays a mediating role. In the longer term, the availability of soil moisture and nutrients affects canopy-atmosphere exchange by virtue of their influence on stand structure, species composition, and ecological succession.

To produce generalizable knowledge of exchange mechanisms and quantities, holistic and integrated studies of forest meteorology are required. This chapter summarizes our attempts to conduct such forest meteorology research at the Walker Branch Watershed. Following a description of the research site and facilities, the characterization of relevant boundary conditions is discussed. Results of intensive experimental and theoretical studies of deciduous forest canopy radiation transfer are presented, and the status and preliminary results of canopy-atmosphere turbulent exchange are described.

As a result, an overestimate of rsc by nearly a factor of 2 by the Penman-Monteith model is to be expected. With these comments in mind, the comparisons of Fig. 11 strongly support the conclusion that the coupled Jarvis-Norman model of Baldocchi et at. (1987) adequately characterizes bulk canopy stomatal behavior in terms of canopy-atmosphere exchanges of latent heat in the case of a soybean canopy. Similar tests, using rjLAI and environmental data from the Walker Branch forest canopy, await acquisition of suitable data sets.

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