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The aim of this work was to determine seasonal dynamics of the herbaceous vegetation in the deciduous forests and their relations with climatic factors. The object of the work was Kamsha zoological-botanical reserve situated near Kaunas. Investigations were done during vegetation periods in 1991, 2000, 2006 and 2006. The dates of phenological appearance and projection cover were recorded. The spectra of vegetation and flowering were made. The data on temperature and precipitation was analysed with the purpose to determinate the influence of climatic conditions on the growth and development of plants. It was determined, that vegetation of herbs started at the beginning of April (12th-13th week). Intensive vegetative development started at the 14th week in 1991 and 2007, and at 16th week in 2000 and 2006. In 2006 projection cover of herbs showed two picks - one in spring time and other in August. Projection cover in 2000 decreased during dry period in September. In the coldest spring (2006) flowering of herbs started two weeks later than in years of 1991 and 2000. In the warmest year (2007) flowering of herbs started two weeks earlier than in years of 1991 and 2000. In the warmest year (2007) foliation of trees started and completed 2 weeks earlier than in 2000 and 2006. In 1991 foliation of trees started 2 weeks later, but completed about at the same time like in 2000 and 2006. The majority of plants flowered in spring when trees were without leaves and light conditions were good. [ABSTRACT FROM AUTHOR]

The aim of this work was to determine seasonal dynamics of the herbaceous vegetation in the deciduous forests and their relations with climatic factors. The object of the work was Kamsha zoological-botanical reserve situated near Kaunas. Investigations were done during vegetation periods in 1991, 2000, 2006 and 2006. The dates of phenological appearance and projection cover were recorded. The spectra of vegetation and flowering were made. The data on temperature and precipitation was analysed with the purpose to determinate the influence of climatic conditions on the growth and development of plants. It was determined, that vegetation of herbs started at the beginning of April (12th-13th week). Intensive vegetative development started at the 14th week in 1991 and 2007, and at 16th week in 2000 and 2006. In 2006 projection cover of herbs showed two picks - one in spring time and other in August. Projection cover in 2000 decreased during dry period in September. In the coldest spring (2006) flowering of herbs started two weeks later than in years of 1991 and 2000. In the warmest year (2007) flowering of herbs started two weeks earlier than in years of 1991 and 2000. In the warmest year (2007) foliation of trees started and completed 2 weeks earlier than in 2000 and 2006. In 1991 foliation of trees started 2 weeks later, but completed about at the same time like in 2000 and 2006. The majority of plants flowered in spring when trees were without leaves and light conditions were good. [ABSTRACT FROM AUTHOR]