Folgen eines Klimawandels für die biogene Sandstabilisierung in Küstendünen

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This dataset is part of Edaphobase.

Edaphobase is a data warehouse that collects information from literature, museum collections and research data about the distribution and ecology of soil organisms (earthworms, potworms, nematodes, springtails, proturans, diplurans, moss/beetle mites, gamasina mites, centipedes, millipedes, woodlice, soil fungi and soil prokaryotes).

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Detlev Handelmann

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Description of this dataset

Coastal dunes have an important function as unique habitats for plants and animals as well as natural barriers against storm tides. Thus, they are of special value for nature conservation and coastal defence issues. In context of the potential endangering of coastal dunes due to accelerated climate change the presented study deals with the impact of climate change on biogenic sand stabilization, which has to be conceived as an ecosystemic process. The aim of the present investigation was to point out the impact of e1evated temperature on alterations in biogenic sand stabilization and causally connected reaction patterns of involved organisms. Within the scope of a 2-years-Iasting fie1d experiment conducted on the East frisian Island Norderney the microclimate near the soil surface was modified by gauze covering, which was set up on 4 m2 sized field plots planted with Marram grass. The top soil temperature increased by approximately I K under the gauze covered plots versus the control plots. Soil samples were taken in intervals of 3 months for measuring plant- and microbial biomass, soil fauna abundances of different trophic groups (Nematoda, Collembola, Gamasina) and soil structure. Production of plant- and microbial biomass, densities of nematodes and the rate of soil aggregates as specification of the soil structure increased by the experimental change of microclimate. Significant response of Collembola and Gamasina could not be detected. However, their abundances showed an explicit positive correlation with subterranean plant biomass. Hence, at least an indirect effect of the modified microclimate on Collembola and Gamasina can be concluded. Corresponding reactions and feedbacks within the ecosystem are to be assumed since the perceived alterations occured almost unidirectionally in all parameters. The findings of this investigation indicate that biogenic sand stabilization in coastal dunes will increase if the regional climate scenario for the year 2050 (elevated temperature and precipitation) will apply. A resulting favourable effect on stability and capability of regeneration of coastal dunes may be counteracted by prospective consequences of advancing storm situations and an accelerated sea level rise. Thus, predictions concerning stability of coastal dunes under conditions of the expected climate change are indecisive.

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