Ordination of Vegetation of Miscanthus-type Grassland under the Some Artificial Pressure

Abstract

Vegetation of Miscanthus-type grassland located in Kanto region of Japan and subjected to artificial pressure such as cutting, burning, and grazing were investigated in the fixed quadrates for 20 years. Community data, as represented by the extended summed dominance ratio, E-SDR2, was ordinated by principal component analysis. The first component, characterized by Miscanthus sinensis and Zoysia japonica, indicated the effect of grazing. The second component, characterized by trees, indicated natural succession. Yearly vegetational data for each plot was plotted on these two component axes. The vegetation of each plot was distributed depending on the kind of artificial pressure.