. Plant succession; an analysis of the development of vegetation. Plant ecology. BRITAIN. 255 etc. The Quercetum arenosum may similarly yield to scrub and then to grass- heath. Heath (Callunetum arenosum) may arise from oak-birch-heath or it may develop on bare sands. The developmental relations of oakwood, scrub, heath, and grassland are shown in figure 14. Formation of sandy and gravelly soils Heath Formation Dry oakwoorf association i -> Scrub ⢠Grassheath -*â association Oak-birch heath association 1. Oakwood i i"^ 2. Beechwood â go S-^3. Birchwood .2^g'4. Pinewood "^ * [sub-
. Plant succession; an analysis of the development of vegetation. Plant ecology. BRITAIN. 255 etc. The Quercetum arenosum may similarly yield to scrub and then to grass- heath. Heath (Callunetum arenosum) may arise from oak-birch-heath or it may develop on bare sands. The developmental relations of oakwood, scrub, heath, and grassland are shown in figure 14. Formation of sandy and gravelly soils Heath Formation Dry oakwoorf association i -> Scrub ⢠Grassheath -*â association Oak-birch heath association 1. Oakwood i i"^ 2. Beechwood â go S-^3. Birchwood .2^g'4. Pinewood "^ * [sub-spontaneous] 5. Heath Heath assoc atlon Scottish 'pinewood _ Heathy 'birchwood ^ English pinewood [sub-spontaneous] Fig. 14.âSerai relations of woodland in England. After Tansley. Moss (137) has indicated the relationship of the formation of siliceous soils as shown in figure 15. Woods of Betula tomentosa or of Qnercos sessiliflora ^amps Various stages of scrub. ^olinia grassland Nardus grassland with much Calluna [Moorland formationj Fig. 15.âSerai sequences in the Pennines, England. After Moss. The associations of the chalk subformation are grouped by Tansley and Rankin (178) as in figure 16. i^tWOOl Beechwood [with much yevfl iYew wood y Chalk scrub + Yew growes Chalk grassland »-Chalk heath Fig. 16.âSerai commtmities on chalk, southern England. After Tansley and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clements, Frederic E. (Frederic Edward), 1874-1945. Washington, Carnegie Institution of Washington
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