Microsite analysis of tree species along an elevational gradient.

Abstract

From data collected on the lateral glacial moraine found along County Road 64, we analyzed a number of abiotic and biotic factors in order to determine how they affect the tree community as elevation decreases. Tree species and number were recorded from fifteen 10 by 10 meter plots at fifty meter intervals down our transect. Soil samples were taken from the A1 and B horizons of each plot and tested for moisture, organic matter, and macronutrient content. Regressions, correlations, and chi-square tests were used to determine the statistical significance of our data. We found that changes in the tree community along the gradient are not random, and are influenced mainly by soil moisture content. There is a higher tree density and species richness found with decreased elevation. These biotic and abiotc changes occurred gradually along the length of the transect. We therefore conclude that there is a relationship between woody plant community composition and elevation along the moraine.