General differences in experimental contour and flat plots and control forest plots are often quite visible, and give an intuitive idea of where to proceed with further analysis. The following graphics suggest the scope of variation in the ground surfaces. And finally, by comparing experimental contour and flat plots, it can be seen whether the contour treatments actually made a significant difference in the soil surface. Tree positions in relation to microtopography in forest plots. Trees are marked in red.
Tick marks are in meters.
As an additional study, the positions and diameters of the trees in the forest topography plots were recorded. By superimposing this information onto two-dimensional contour graphs, the positions of the trees in relation to microtopography can be assessed. Trees are expected to show a preference for mounds in moist soils. References Barry, W.J., A.S. Garlo, and C.A. Wood 1996. Beatty, S.W. 1984.