A Field Study on the Ecology of Centaurium vulgare Rafn

Self Cite

Centaurium littorale was cultured under various conditions of nutrient availability, salinity and pH. The mineral composition of the experimental plants and of plants from a field site was investigated. The highest relative growth rate observed was 0.02 mg.mg.-1 day-1 and the shoot: root ratio was 0.8. Optimal growth occurred at very low nutrient availability. Suction tensions below 7 atm had no strong effect on the growth rate. There was a marked accumulation of NaCI in the tissues without a negative effect on the uptake of nutrient ions. In the pHrange 7.7-4.8 growth was equal. In its growth physiology and mineral nutrition Centaurium littorale is well adapted to the habitat: the brackish and poor young dune soil.

“…UNGAR 1967). In nature Centaurium littorale germinates especially in spring when the soil moisture content is highest and the salt concentration is negligible (FREIJSEN 1967).…”

Section: Discussionmentioning

confidence: 99%

Section: Germination and Salinitymentioning

confidence: 92%

Section: Mineral Composition In the Fieldmentioning

confidence: 92%

“…All of them were carried out with plants of Centaurium littorale var. iberoides (Jonker) Freijsen 1967. The seeds were collected in the dunes near Oostvoorne, S.W.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Growth-Physiology, Salt-Tolerance and Mineral Nutrition of Centaurium Littorale (Turner) Gilmour: Adaptations to Its Olygothrophic and Brackish Habitat

Freijsen¹

1971

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Demographic Studies of Anthyllis Vulneraria L. In the Netherlands

Sterk

1975

In the course of 4 to 6 years demographic studies were made of several coastal populations of Anthyllis vulneraria L. var. langei Jalas and of an inland population of the var. vulneraria. Fluctuations in the population density, in the biomass and in the rate of flowering were recorded, and in addition the relation between life span and flower production was investigated.Coastal populations appear to exhibit a far greater fluctuation in density, annual biomass production and rate of flowering than the inland population studied. These different degrees of fluctuation are associated with differences in the environment. In the interior, fewer flowers are produced per plant and the plants more often flower only once, whilst more plants start flowering at a later age than is the case in coastal populations. The differences in the pattern of flowering are most probably correlated with the denser stands of vegetation at the site in the interior where the mutual competition among the plants is stronger. The total life-span of the plants appears to be about the same near the coast and in the interior. Coverage: mosses and lichensRe leve E I: Hypnum cupressiforme L. var. elatum B.S. 70%, Dicranum scoparium Hedw. 20%; Re le ve E 2: Hypnum cupressiforme L. var. elatum B.S. 20%, Dicranum scoparium Hedw. 20%, Cladonia impexa Harm. p, Cladonia pityrea (Florke) Fr. a, Cladonia rangiformis Hoffm. p, Cladonia furcata Schrad. a; Re le ve E 3: Hypnum cupressiforme L. var. elatum B.S. 50%; Re lev e E 5: Hypnum cupressiforme L. var. elatum B.S. 40%; Re le ve T: Cladonia furcata Schrad. p, Cladonia rangiformis Hoffm. p, Peltigera spuria (Ach.) DC. r, Cladonia chlorophaea Spreng. p, Ceratodon purpureus Brid. p, Tortula ruralis Ehrh. p; Re leve W: Fissidens taxifolius Hedw. 02, Camptothecium lutescens (Hedw.) B. and G. a, Campylium chrysophyllum (Brid.) Lange a, Pseudoscleropodium purum (Hedw.) Fleisch. a, Weissia controversa Hedw. p, Brachythecium rutabulum (L.) B.S.

Hapaxant Species of Coastal Beach Plains Colonizing Embanked Sand Flats

Bruinenberg

Joenje

1980

The article documents the colonization of sand tlats exposed in a new polder by r-selected species of beach plain environments. i.e. Sagina maritima, Juncus bufonius ssp. ambiguus. Centaurium pulchellum, C. littorale and Sag ina nodosa var. moniliformis. Species distribution along transects after eight years of succession in the polder and on the beach plain of the island of Schiermonnikoog were compared and related to combinations of the principal environmental factors: salinity. hydrology and % coverage of the vegetation. It is concluded that several hapaxant species of beach plain communities. and especially those belonging to the B2 life form (summer annuals exhibiting innate dormancy) are pre-destined to be successful colonizers of embanked flats, indicating temporary ecological similarity. The more even distribution of the species in the hapaxant life form spectrum of the polder susceptibly indicates the succession towards mesic communities.