Abstract
We studied the effects of wear on the understorey vegetation and the soil microbial community structure (phospholipid fatty acid pattern) in urban forests of medium fertility and of varying size in the capital area of Finland, Helsinki. These forests are important sites of recreation for a large number of residents. Consequently, the cover of understorey vegetation is affected by trampling. In the study, the cover of ground layer plant species (mosses) was found to be lower than in rural reference areas. We found that microbial activity, measured as soil respiration, was lower in the most worn forest patches as compared to less worn sites. Further, the microbial community structure of the humus layer changed due to the effects of wear. By comparing the PLFA pattern in trampled and un-trampled forest patches, we found out that the most important factors affecting the structure of microbial community were the dominant tree species (the proportion of broad-leaved tree species in relation to conifers), and the composition of the understorey vegetation. Thus, we could conclude that wear affects the microbial community structure through changes in vegetation, in the quality of litter shed, and through resultant changes in the humus pH, rather than only through soil compaction.
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Malmivaara-Lämsä, M., Fritze, H. Effects of wear and above ground forest site type characteristics on the soil microbial community structure in an urban setting. Plant and Soil 256, 187–203 (2003). https://doi.org/10.1023/A:1026227702403
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DOI: https://doi.org/10.1023/A:1026227702403