. Research methods in ecology. Plant ecology. 258 THE FORMATION covering on their faces, while the forces which produce disintegration oper- ate from above or below. 317. Succession by binding aeolian soils. Dunes (thinia) are classic ex- amples of the reaction of pioneer vegetation upon habitats of wind-borne sand. The initial formations in such places consist exclusively of sand- binders, plants with masses of fibrous roots, and usually also with strong rootstalks, long, erect leaves, and a vigorous apical growth. They are al- most exclusively perennial grasses and sedges, possessing the uni
. Research methods in ecology. Plant ecology. 258 THE FORMATION covering on their faces, while the forces which produce disintegration oper- ate from above or below. 317. Succession by binding aeolian soils. Dunes (thinia) are classic ex- amples of the reaction of pioneer vegetation upon habitats of wind-borne sand. The initial formations in such places consist exclusively of sand- binders, plants with masses of fibrous roots, and usually also with strong rootstalks, long, erect leaves, and a vigorous apical growth. They are al- most exclusively perennial grasses and sedges, possessing the unique prop-. Fig. 06. Thicket formation (Qiicrcus-Holodiscus-driodium), stage V of the talus siicces.'iion. erty of pushing up rapidly through a covering of sand. They react by fixing the sand with their roots, thus preventing its blowing about, and also by catching the shifting particles among their culms and leaves, forming a tiny area of stabilization, in which the next generation can establish a foot- hold. The gradual accumulation of vegetable detritus serves also to enrich the soil, and makes possible the advent of species requiring better nourish- ment. Blowouts {anemia) are almost exact duplicates of dunes in so far as the steps of revegetation are concerned; while one is a hollow, and the other a hill, in both the reaction operates upon a wind-swept slope. Sand-hills (amathia) and deserts (eremia) show similar though less marked. 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. Lincoln, Neb. , University Pub. Co.
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