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CR 39:209-219 (2009)  -  DOI:

Influence of climate change on phenological phases in Latvia and Lithuania

Gunta Kalvāne1,*, Danuta Romanovskaja2, Agrita Briede1, Eugenija Bakšienė2

1University of Latvia, Faculty of Geography and Earth Sciences, Raina Blvd. 19, Rīga 1059, Latvia
2Voke Branch of Lithuanian Institute of Agriculture, Zalioji a. 2, Vilnius 02232, Lithuania

ABSTRACT: To investigate the impact of recent climatic changes on plant development, this study used phenological data of the volunteer networks in Latvia and Lithuania from the 1971–2000 period. The phenological calendar method was applied. Phenological seasons were described using data on 6 phenological phases at 10 stations. The growing season was described using birch Betula pendula as an example. Correlation analysis, linear regression and non-parametric Mann-Kendall trend tests were applied to establish the relationship between phenological phases and meteorological factors (temperature, precipitation) and the North Atlantic Oscillation (NAO). The results indicate a statistically significant trend toward earlier onset of spring and summer phases. The study found that, unlike the majority of trends observed in Europe, on average the onset of phenological autumn in Latvia and Lithuania also started earlier. The observed trends in spring correlated well with temperatures in the preceding months and with the NAO. A strong correlation (in 12 cases out of 20) was found between spring phenophases and precipitation in February.

KEY WORDS: Phenology · Climate change · Phenological trends · Time series · Growing season

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Cite this article as: Kalvāne G, Romanovskaja D, Briede A, Baksiene E (2009) Influence of climate change on phenological phases in Latvia and Lithuania. Clim Res 39:209-219.

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