Acta Phytogeographica Suecica

G. Samuelsson

Die Verbreitung der höheren Wasserpflanzen in Nordeuropa.

北欧高等水生植物的分布。

H. Smith

Carex arctogena nova species.

新种高山薹草（Carex arctogena）

Scorpidium turgescens (Th. Jens. ) Moenkem. En senglacial relikt i nordisk alvarvegetation.

N. Albertson

Scorpidium turgescens (Th. Jens.) Moenkem. 在北欧阿尔瓦植被中的一个冰期残遗种。

Die Verbreitung der Alchemilla-Arten aus der Vulgaris-Gruppe in Nordeuropa (Fennoskandien und Danemark)

Gunnar Samuelsson

Die Verbreitung der Alchemilla-Arten aus der Vulgaris-Gruppe in Nordeuropa (Fennoskandien und Dänemark)

北欧（芬诺斯坎迪亚和丹麦）中来自Vulgaris组的羽衣草种的分布

Den nordiska utbredningen av Lactuca alpina, Aconitum septentrionale, Ranunculus platanifolius och Polygonatum verticillatum

Magnus Fries

Den nordiska utbredningen av Lactuca alpina, Aconitum septentrionale, Ranunculus platanifolius och Polygonatum verticillatum.

北欧地区乳菇、北方乌头、悬铃木叶毛茛和轮叶黄精的分布。

In the past, arable fields were established locally on the alvar on Oland. Several persisted until the present time, but some of them were abandoned shorter or longer ago. We found a series of arable fields forming a chronosequence: still cultivated, ca. 20 years abandoned, ca. 50 years abandoned, and never cultivated. Species of man-influenced habitats gradually disappeared from the former arable fields, but a few persisted after 50 years. A group of alvar species had re-established after 20 years, but others did not re-establish even after 50 years of abandonment, although they are present in the local species pool. We found no evidence of dispersal as a constraint for re-establishment.

Jan P. Bakker

K. Steg

E. Rosen

Re-establishment of alvar plant species in abandoned arable fields on Öland

奥兰岛弃耕地阿尔瓦植物物种的重新建立

Nutrient and water supply, light availability and removal of biomass were manipulated in a limestone grassland community on the Swedish island of Oland from 1990 to 1993 in order to investigate how these factors influence species richness and year-to-year turnover at fine scales. Turnover, broken down into disappearance (‘extinction’) and appearance (‘immigration’) of vascular plant species, was measured at different spatial scales in plots ranging from 4 cm2 to 0.25 m2. For most treatments, turnover was highest at the finest scale, both measured as absolute and relative numbers. Turnover rate increased at all scales when the treatment implied such a change in the environment, where application of fertilizer was combined with shading. In these cases, disappearance of species largely exceeded appearance in a predictable manner, and resulted in species-poor assemblages at all scales. In plots treated with either fertilizer or shade, there were large differences in the direction of the turnover (i.e. whether immigration or extinction dominated) between years, apparently depending on the weather conditions in the respective year. After drought spells total turnover was also high for such treatments, whereas plots regularly receiving additional water supplies had rather similar turnover rates during the whole experiment.

Renate Huber

Eddy van der Maarel

Plant species turnover in an alvar grassland under different environmental conditions and at different scales

不同环境条件和尺度下岩生草甸植物物种更替

We studied dry grassland vegetation on southern Oland, both within and outside the Great Alvar, using the Braun-Blanquet approach. We were able to distinguish 15 associations or equivalent units belonging to three major syntaxa. Dry grasslands on sandy soils (class Koelerio-Corynephoretea; subclass Koelerio-Corynephorenea) occurred along the east and west coasts. Weathered rock and outcrop communities (class Koelerio-Corynephoretea; subclass Sedo-Scleranthenea) inhabited shallow skeletal soils, mainly on the Great Alvar. Semi-dry basiphilous grasslands of the class Festuco-Brometea occurred on moraine soils, which were the least extreme in terms of soil moisture and nutrient availability. Whereas the first category comprises impoverished variants of widely distributed syntaxa, all Sedo-Scleranthenea and Festuco-Brometea communities lack direct counterparts in central Europe. The alvar communities proved to be floristically well separated from the others. Species density on 4 m2 was highest in the Sedo-Scleranthenea (that of the Gypsophilo fastigiatae-Globularietum vulgaris with 80 taxa being one of the highest known), intermediate in the Festuco-Brometea, and lowest in the Koelerio-Corynephorenea. Harsh and variable conditions, small plant sizes, and a large local species pool are considered possible causes.

Swantje Löbel

J. Dengler

Dry grassland communities on southern Öland: phytosociology, ecology, and diversity

南厄兰岛干草原群落：植物社会学、生态学与多样性

The relationships between properties of present landscapes and species diversity within fragmented grasslands have been the subject of many studies. However the potential roles of grassland history ...

Honor Prentice

B.O. Jonsson

Martin Sykes

Margareta Ihse

Merit Kindström

Fragmented grasslands on the Baltic island of Öland: Plant community composition and land-use history

波罗的海厄兰岛上的破碎草地：植物群落组成与土地利用历史

E Rosén

S-O Borgegård

8. The open cultural landscape

8. 开放的文化景观

Publication Information	Publisher: Opulus Press AB，Publishing cycle: ，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 2007，Proportion of original research papers: ，Self Citation Rate:， Gold OA Rate:

Acta Phytogeographica Suecica

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