Plant Biodiversity in Urbanized Areas by Sonja Knapp

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By Sonja Knapp

Urbanization is likely one of the major drivers of worldwide swap. It frequently occurs in parts with excessive biodiversity, threatening species world wide. to guard biodiversity not just outdoors but additionally correct inside city components, wisdom in regards to the results of city land use on species assemblages is vital. Sonja Knapp compares numerous features of plant biodiversity among city and rural parts in Germany. utilizing broad databases and smooth statistical equipment, she is going past species richness: city components are wealthy in species yet plant species in city parts are nearer relating to one another than plant species in rural parts, respectively. The city atmosphere, characterised by means of excessive temperatures and widespread disturbances, adjustments the sensible composition of the plants. It promotes e.g. short-lived species with leaves tailored to drought yet threatens insect-pollinated or wind-dispersed species. the writer claims that the safety of biodiversity will not be basically specialize in species richness but in addition on practical and phylogenetic range, additionally correct inside city parts, to maintain a plant life with a excessive capability for edition to altering international stipulations.

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The Saale valley in the northern part of the city and in the district of Saalkreis, north-west of the city, is characterized by porphyric rocks that border the valley. The south-western part of Halle is built on Materials and Methods 33 Triassic and Tertiary bedrock. The north-eastern and the south-western parts of the city and its surroundings are divided by a fault line that runs directly through the city center giving rise to a salt spring from Late Permian (Wagenbreth & Steiner 1982). In the eastern part of the city, older bedrocks are nearly completely overlaid by quaternary bedrock.

They did, however, not consider shifts in trait state frequency. If these shifts in trait spectra indeed occur, they might affect ecosystem functioning: Increased leaf dry matter content for example might decrease litter decomposability (Kazakou et al. 2006). Today’s differences in the trait state composition of urban and rural floras might point to potential future shifts with further urbanization. We compared the proportions of several trait states of vascular plants in urbanized, agricultural and semi-natural areas in Germany.

Data on climate [mean annual, mean July and mean January temperature, mean difference between July and January temperature (all 1961-1990), mean annual precipitation (1951-1980), mean wind speed] were provided by the “Deutscher Wetterdienst Department Klima und Umwelt”; data on topography (mean altitude above sea level) were provided by ESRI (ARCDeutschland 500 dataset, 1: 500,000); data on soils (number of soil types, number of soil patches), and geology (number of geological types, number of geological patches) are based on the German soil survey map (Bundesanstalt für Geowissenschaften und Rohstoffe 1995) and the Geological survey map (Bundesanstalt für Geowissenschaften und Rohstoffe 1993) provided by the German Federal Agency for Nature Conservation.

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