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Population genetic structure in European populations of Spiranthes romanzoffiana set in the context of other genetic studies on orchids
Spiranthes romanzoffiana Cham. is restricted in Europe to the British Isles, where it is recognised as a conservation priority species due to frequent extirpation of populations along with noExpand
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A QUANTITATIVE ANALYSIS OF SHOOT PHENOLOGY AND DOMINANCE IN HERBACEOUS VEGETATION
SUMMARY (1) Variation in standing crop and in litter has been measured by seasonal sampling and sorting of the herbaceous vegetation at thirteen sites in the Sheffield region. The vegetation typesExpand
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EFFECTS OF TREE LEAF LITTER ON HERBACEOUS VEGETATION IN DECIDUOUS WOODLAND
SUMMARY (1) In two areas of deciduous woodland, measurements were made of the spatial variation in the shoot biomass and species-composition of the ground flora and of the amount of persistent treeExpand
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Regeneration by natural layering of heather (Calluna vulgaris): frequency and characteristics in upland Britain
1. Heather, Calluna vulgaris, can regenerate by layering (adventitious rooting) of stems. The frequency of layering stems, and strength of adventitious rooting, was surveyed in 11 stands (of 0.5-2 haExpand
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Changes in burning of Scottish heather moorland since the 1940s from aerial photographs
Abstract Changes in the burning of heather moorland were studied in the Borders and Grampian Regions of Scotland using aerial photographs from the 1940s, 1960s and 1988. Seven out of 32 sitesExpand
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A comparative study of root development using a simulated rock crevice
(1) Using seeds collected from the same grassland community, root development was examined in seedlings of four perennial herbs grown in containers simulating a shallow limestone soil profile.Expand
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Distribution and ecology of small cow-wheat (Melampyrum sylvaticum L.; Scrophulariaceae) in the British Isles
Summary Melampyrum sylvaticum L. is an annual, hemiparasitic herb which mainly grows in light woodland and on upland ledges in northern Britain and Ireland. Its distribution is poorly known due toExpand
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Can we protect threatened Scottish arctic-alpine higher plants?
The threatened arctic-alpine plants in Scotland are described from the results of a comprehensive survey carried out between 1990 and 1996 which attempted to record all populations. The factorsExpand
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A COMPARATIVE STUDY OF LEAF DEMOGRAPHY IN LIMESTONE GRASSLAND
(1) A study of leaf demography was conducted to investigate seasonal changes in shoot biomass within a community of grassland plants. The appearance and death of leaves and the changes in length ofExpand
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