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Postglacial patterns in trees diversity and distribution in Romania: homogenization or differentiation?

Domenii publicaţii > Ştiinţele pământului şi planetare + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Feurdean, A., Willis, KJ, Parr, CL, Tanţãu, I., Fãrcaş, S.

Editorial: Journal of Biogeography, 37(11), p.2197-2215, 2010.

Rezumat:

This paper examines eight fossil pollen datasets from Romania with the aim of exploring regional and elevational patterns in site similarity throughout the Holocene. In particular, we aim to determine whether there are clear intervals of homogenization /differentiation and to ascertain the potential driving factors. We found strong variability in the past vegetation dynamics during the Holocene. Bray-Curtis similarity analyses show large fluctuations in vegetation similarity and distinct periods of homogenization and differentiation throughout the Holocene. The magnitude and length of these periods appear quite variable in
time, but the significant ones can be delimited as follows: (1)differentiation
between 11,250 and 11,000 cal. yr BP, 10,000 and 9750 cal. yr BP, 6000 and
5750 cal. yr BP, 2500 and 2250 cal. yr BP, and especially over the last 200 years; and (2) homogenization between 9750 and 9500 cal. yr BP, and 2750 and
2500 cal. yr BP, with more stable periods between 9000 and 7750 cal. yr BP, 4750 and 3500 cal. yr BP, and 2000 and 1000 cal. yr BP.

Cuvinte cheie: Bray-Curtis similarity, eastern Europe, Holocene, homogenization/differentiation, human disturbance, pollen, Romania, vegetation dynamics