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 place of work of future health and Environmental learn (DOE/OHER), to quantify land-water interactions in a forested panorama. It used to be designed to target 3 vital targets: (1) to increase baseline info on unpolluted ecosystems, (2) to give a contribution to our wisdom of biking and lack of chemical parts in typical ecosystems, and (3) to supply the certainty useful 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 woodland Biome undertaking used to be initiated, and Walker department Watershed was once selected as one of many websites for in depth examine on nutrient biking and organic productiveness. This paintings used to be supported by way of the nationwide technology origin (NSF). Over the following four years, in depth process-level examine on basic productiveness, decomposition, and belowground organic approaches used to be coupled with ongoing DOE-supported paintings at the characterization of easy geology and hydrological cycles at the watershed. In 1974, the NSF's RANN software (Research utilized to nationwide wishes) all started paintings on hint point biking on Walker department Wa tershed as a result of vast info base being constructed below either DOE and NSF support.
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Additional resources for Analysis of Biogeochemical Cycling Processes in Walker Branch Watershed
Pp. 4-17. IN D. L. ), Watershed Research in Eastern North America. A Workshop to Compare Results. Chesapeake Bay Center for Environmental Studies, Smithsonian Institution, Edgewater, Maryland. M. Anderson, L. W. Elwood, T. F. Harris, A. Hunley, W. l. L. E. Todd. 1971. Walker Branch Watershed: A study of terrestrial and aquatic system interactions. pp. 30-48. IN Ecological Sciences Division Annual Report, 1971. ORNL-4359. Oak Ridge National Laboratory, Oak Ridge, Tennessee. C. R. S. D. Huff. 1979.
If such constancy were found among species in a variety of forests, the height variation in unitarea dry leaf weight might be a useful characterization of forest canopies at particular sites, or it may represent an ecological constant that is maintained over a range of deciduous canopy types. We have attempted to parameterize the leaf stomatal resistance vs. PAR response curve for derivation of bulk canopy stomatal resistances by means ofthe coupled Norman-Jarvis model described earlier. Minimal stomatal resistance values observed in the Walker Branch forest canopy are of the order of 100 to 150 s/m.
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.