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- Title
ECOLOGICAL AND FLORISTIC STUDIES ON DRY SAND SLOPES IN WESTERN SEALAND.
- Authors
Fredskild, Bent
- Abstract
On some hills—drumlins, ridges, etc. with sandy soil—in south-western Sealand, which has the lowest rainfall in Denmark, the vegetation and soil on 60 sites have been investigated. The vegetation has been divided into various types of which the most important are the open continental dry-slope vegetation with abundant southern and continental therophytes and the closed continental dry-slope vegetation which is poor in therophytes, but rich in perennial species. The soils on the hills are characterized by: Average content of silt-clay 11.5 per cent. (1.7–30.0); stone plus gravel content between 0.1 and 33.9 per cent.; pH generally between 7 and 8 (only 8 sites showed pH below 6.5, including four from a barrow with acid clay (4.8–5.7) and discrepant vegetation); most soils contained some lime (up to 13 per cent.); moisture equivalent generally 10–20 per cent. (7.4–56.7); loss on ignition only a few per cent. (1.1–14.9); the soil is rather poor in salt solutes: χ20 ⊗ 106 generally between 100 and 200 (63–493). The dependence of these factors on depths is discussed. Contents of soil moisture were measured for the period April 29-September 24, 1954 (Fig. 2) at three depths in five sites (minimum 0.4 per cent., maximum 41.1 per cent.). On a southern slope all plants in a limited area were dug out in three different seasons, root depths being measured and the root depths of the therophytes being compared for spring, summer and autumn.
- Subjects
DENMARK; SLOPES (Soil mechanics); VEGETATION &; climate; ANNUALS (Plants); SOIL composition; SOIL testing; SOIL moisture; PLANT ecology
- Publication
Oikos, 1954, Vol 5, Issue 2, p205
- ISSN
0030-1299
- Publication type
Article
- DOI
10.2307/3565162