Figure 1. Infrared spectra of vanadium-oxides a) V20" b) V204, c) V205(2-6) as a basis for the interpretation of spectroscopic data pertaining to vanadium-oxide-based catalysts, and hence as a starting-point for discussion of the behavior of these catalysts in practical applications, it seems of interest to make our findings known.

This study developed regional overstory-understory models for four forest types in southeastern Alabama and tested the ability of these models to predict understory vegetation using overstory data from southern and southwestern Alabama. Cross-sectional data from the USDA Forest Service Forest Inventory and Analysis Unit Multiresource Survey of Alabama was used to analyze the relationship between timber stand characteristics and herbaceous cover under planted pine, natural pine, mixed pine-hardwoods, and upland hardwoods. Herbaceous cover was significantly related to total growing stock volume of timber in all forest types. Stand characteristics and management activities that affected herbaceous cover varied by forest type. The models for planted pine, mixed pine-hardwoods, and upland hardwoods captured a significant amount of the variation in the original data. Extrapolation of southeastern Alabama overstory-understory relationships to southern and southwestern forests was not possible with these models.

A point frame has been modified to allow for plant cover estimates to a 152 cm height. Construction ofa third crossmember that can be added to a 76.cm tall point frame allows sampling pins to be projected both upward and downward. Spacings between pins were changed to produce equal sampling areas while sampling circular plots. This design was tested with a miniature point frame on artificial plant populations and was shown to measure within 3~5% of actual cover values.

SUMMARYThe

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