Changes in the physiological processes of Norway spruce seedlings induced with brown rot decomposed timber
1991
Podracka, O. (Ustav pro Hospodarskou Upravu Lesa, Brno (CSFR)) | Cervena, M.
The seedlings of Norway spruce Picea abies were cultivated in sand cultures with differentiated amounts of pulverized brown rot decomposed spruce timber. Brown rot decomposed timber induced in the seedlins changes in the basic growth parameters. If only decomposed timber was used as a substrate, the growth of seedlings was largely inhibited, and this inhibition increased during the trial. A mixture of mineral soil and decomposed timber at the ratio of 1 : 1 permanently stimulated the seedling growth: it stimulated first of all the growth in the root part, the response of which to the substrate composition was most sensitive. In the resting period, a significant shift of dry matter from the aboveground parts of seedlings the roots occurred in variants 50 and 100. The presence of decomposed timber in the substrate was manifested as changes in the root system morphology. In decomposed timber as the only component of substrate, the growth of main root was inhibited completely and the lateral roots were short and thin. Fifty volume per cent of decomposed timber used in the substrate induced the rich branching of main root; the roots of this variant were always longer than the roots of the control variant. The decomposed timber in substrate did not influence the chlorophyll content in assimilation organs. Neither did the chlorophyll a : b ratio change. Decomposed timber increased the resistance of spruce seedlings to frost; this was manifested in the higher per cent survival of seedlings grown in variants 50 and 100.
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