Groundlayer vegetation gradients across oak woodland canopy gaps1

摘要: Abstract Pavlovic, N., R. Grundel, and W. Sluis (U.S. Geological Survey, Great Lakes Science Center, 1100 N. Mineral Springs Rd., Porter, IN 46304). J. Torrey Bot. Soc. 133(2): 225–239. 2006.—Frequency of groundlayer plants was measured across oak woodland canopy gaps at three sites in northwest Indiana to examine how vegetation varied with gap size, direction along the edge, microhabitat. Microhabitats were defined as under adjacent gap, within gap. Gap-sites consisted plus tree canopy. Gaps classified small (16 ± 1 m2), medium (97 8), large (310 32). Neither richness nor diversity differed among microhabitats, sizes, or edges. Similarity between microhabitats wthin a gap-site increased distance plots decreased difference PAR decreased, latter explaining twice variation percent dissimilarity compared Mg concentration, A horizon depth, litter cover. Diervilla lonicera, ...