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 venture at the Oak Ridge Reservation in east Tennessee in 1967, with the help of the U. S. division of Energy's workplace of overall healthiness and Environmental examine (DOE/OHER), to quantify land-water interactions in a forested panorama. It was once designed to target 3 crucial targets: (1) to increase baseline information on unpolluted ecosystems, (2) to give a contribution to our wisdom of biking and lack of chemical components in normal ecosystems, and (3) to supply the knowledge precious for the development of mathe matical simulation types for predicting the results of man's actions on forested landscapes. In 1969, the foreign organic Program's japanese Deciduous wooded area Biome venture used to be initiated, and Walker department Watershed used to be selected as among the websites for extensive learn on nutrient biking and organic productiveness. This paintings used to be supported by means of the nationwide technological know-how beginning (NSF). Over the subsequent four years, extensive process-level study on fundamental productiveness, decomposition, and belowground organic techniques 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 aspect biking on Walker department Wa tershed end result of the huge facts base being constructed less than either DOE and NSF support.
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Additional info for Analysis of Biogeochemical Cycling Processes in Walker Branch Watershed
SJ. M. Norman. 1986. A. J. Ecol. 74:635-676. If forest canopy architecture were static, the data presented in Figs. 9 would constitute a reasonably complete characterization of a canopy in terms of radiation transfer. However, the structure of a deciduous canopy varies drastically from season to season and more subtly from year to year. Y. 0 1. 9. , Q. prinus; and 0, Aeer rubrum). if is the nondimensional height defined in Fig. 7. A. R. T. l. Gross, SJ. M. Norman. 1986. A. 1. Ecol. 74:635-676. and leafless phases.
13) forest, no variation in PAR penetration with changing solar elevation throughout these days is apparent in Fig. 14a. 46 3: Forest Meteorology As the vernal equinox approaches, the apparent rate of movement of solar paths to the north increases. Hence, the sun appears to rise higher in the sky each day, and the solar beam paths become ever shorter and less optically dense. Consequently, a break appears in the relationship between beam PAR penetration and solar elevation at roughly 30° (Fig. 14b), the elevation where a marked decrease in the optical density of the leafless canopy is visible in Fig.
Data used to generate these figures are from clear to mostly clear days. Radiation is least attenuated in the winter leafless forest (year-day 25) in both the total solar spectrum and the PAR wave band. Despite limited leaf expansion and significantly higher solar elevations throughout much of year-day 95, the penetration of both Rg (Fig. 15) and PAR (Fig. 16) radiation is reduced from that of year-day 25. Continued leaf expansion further reduces radiation penetration by year-day 110. However, comparison of the data for solar radiation in Fig.
Analysis of Biogeochemical Cycling Processes in Walker Branch Watershed by R. I. Van Hook (auth.), Dale W. Johnson, Robert I. Van Hook (eds.)