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Flowering of Picea abies (L.) Karst. clones of Istebna origin in the Kórnik seed orchard

100%

Chalupka W., Rozkowski R.

Dendrobiology

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2004

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tom 51 Supplement

The flowering and graft mortality of Norway spruce clones of Istebna origin was only slightly different from clones of other origin in the same seed orchard. The negative effect ofmoving Istebna clones from the south to the north of their origin was probably compensated by moving them from a higher altitude to lowland. There is a danger that the complete loss of several clones, observed in the seed orchard with time,may really decrease the expected level of genetic variation in the progeny. It is recommended that the mortality of grafts and the reduction in the number of clones in the seed orchard should be under permanent observation.

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Phenology of the wild service tree (Sorbus torminalis (L.) Crantz] in Poznań and Wielkopolski National Park

100%

Bednorz L., Urbaniak A.

Dendrobiology

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2005

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tom 53

3-10

In this paper the results of the 3-year observations (2001–2003) of seasonal rhythm of S. torminalis trees growing in Poznań in Dendrological Garden of Agricultural University and in forests of Wielkopolski National Park are presented. The observations included the course of leaf development, leaf coloration and leaf fall as well as flowering, fruit ripening and fall. Sixteen phenophases were taken into account. The differences in timing and duration of S. torminalis phenophases from year to year, between two sites and among trees within the same site are pointed out and discussed.

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Effect of increased nitrogen depositions and drought stress on the development of young Norway spruce Picea abies (L.) Karst. stands

80%

Palatova E.

Dendrobiology

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2004

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tom 51 Supplement

The effects of drought stress, stress by increased nitrogen depositions and the combined effect of the two stress factors on the growth of Norway spruce Picea abies (L.) Karst. were studied in two stands. The drought stress was induced by reducing atmospheric precipitations by 60% and the increased nitrogen depositions were simulated by repeated applications of ammonium sulphate at a rate corresponding to 100 kg N ha–1 year–1. All stress factors under study affected the height increment of the above-ground part, the length and colour of needles, and the biomass, vertical distribution, functionality and mycorrhizal infection of fine roots. The root system responded to the simulated stresses right from the the very first year of their action, exhibiting a greater damage than the above-ground part of the plant. Drought acted as a stress factor stronger than the nitrogen depositions themselves. The strongest impact was recorded in the simultaneous influence of the stress factors.

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Changes in the density and spatial structure of trees in pine stands planted at different initial spacing

80%

Ceitel J., Szmyt J.

Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

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2004

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tom 69

Ograniczanie wyników

3 Dendrobiology

1 Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

1 Bednorz L.

1 Ceitel J.

1 Chalupka W.

1 Palatova E.

1 Rozkowski R.

1 Szmyt J.

1 Urbaniak A.

1 2005

3 2004

Flowering of Picea abies (L.) Karst. clones of Istebna origin in the Kórnik seed orchard

Phenology of the wild service tree (Sorbus torminalis (L.) Crantz] in Poznań and Wielkopolski National Park

Effect of increased nitrogen depositions and drought stress on the development of young Norway spruce Picea abies (L.) Karst. stands

Changes in the density and spatial structure of trees in pine stands planted at different initial spacing