Typology and successions of grassland communities in the area of Bistra

Špoljar, Mirjana (2012) Typology and successions of grassland communities in the area of Bistra. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Based on the phytosociological and statistical analyses of the relevés collected during 2011 several grassland communities were recognised: ass. Arrhenatheretum elatioris Br.-Bl. ex Scherr. 1925 with the subass. Arrhenatheretum elatioris alopecuretosum Tx. 1937 and ass. Ononido-Arrhenatheretum elatioris (Horvatić) Ilijanić et Šegulja 1983. Due to the abandonment of agricultural activities by local residents, the grasslands are endangered by succession processes that have already led to changes in physiognomy and species composition of a large part of the surveyed communities. Diversity indices were calculated, NMDS, cluster analysis and NMDS with passively projected vectors of Ellenberg's ecological indicator values adjusted by Pignatti were performed, as well as analysis of the CSR strategies based on the Landolt's indices. It was found that the share of typical grassland species decreases in the earlier stages of succession, but the total diversity increases due to colonisation of non-grassland species. On the contrary, in later stages of succession total diversity decreases, and structure and composition of vegetation are changed. Typical grassland species are displaced by herbs, forest species and weeds.

Item Type: Thesis (Diploma thesis)
Keywords: Molinio-Arrhenatheretea, northwestern Croatia, Bistra, grasslands, dynamics of vegetation
Supervisor: Alegro, Antun
Date: 2012
Number of Pages: 65
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 25 Feb 2014 12:11
Last Modified: 02 May 2017 12:07
URI: http://digre.pmf.unizg.hr/id/eprint/489

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