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

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 aid of the U. S. division of Energy's place of work of health and wellbeing and Environmental learn (DOE/OHER), to quantify land-water interactions in a forested panorama. It was once designed to target 3 imperative ambitions: (1) to enhance baseline info on unpolluted ecosystems, (2) to give a contribution to our wisdom of biking and lack of chemical parts in usual ecosystems, and (3) to supply the certainty valuable for the development of mathe­ matical simulation types for predicting the consequences 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 extensive learn on nutrient biking and organic productiveness. This paintings was once supported through the nationwide technological know-how starting place (NSF). Over the following four years, in depth process-level learn on basic 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 point biking on Walker department Wa­ tershed due to the huge info base being built below either DOE and NSF support.

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1986). These features include leaf inclination angle distributions and vertical distributions of silhouette area densities of leaves and woody canopy elements. As is discussed in Sect. 4, studies of radiative transfer in this forest have shown that the degree of foliage clumping is a critical architectural characteristic in defining forest radiation regimes. However, a technique for direct measurement of this characteristic is yet to be devised. 6 shows the cumulative proportion of leaf area density falling into 10° inclination angle classes for the three major canopy strata in this forest.

The observed vertical variation in leaf size and weight agrees with predicted variation based upon thermal regulation, water-use efficiency, and photosynthetic potential (Givnish 1979). The fact that the rate of increase in mean unit-area dry leaf weight with height was relatively constant among species warrants further study of this variable. 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.

Included are those features of the site and of its upwind fetch that affect the flow of air in the surface boundary layer over the 38 3: Forest Meteorology ATDL-M85/389 R E ....... >OeD Z <1:0 Uw ~I­ oU IIlO .... w ~ 20 a... 11. Comparison of bulk canopy stomatal resistances (f,J for water vapor transfer as computed with the Jarvis-Norman model and the Penman-Monteith equation (e) and as measured in a soybean canopy (0). , as f /LAI). D. B. Hicks, and P. Camara. 1987. A canopy stomatal resistance model for gaseous deposition to vegetated surfaces.

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