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Physiological response of Norway spruce foliage in the drought vegetation period 2009

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Author(s): Jaroslav Kmeť | Ľubica Ditmarová | Daniel Kurjak | Tibor Priwitzer

Journal: Časopis Beskydy
ISSN 1803-2451

Volume: 4;
Issue: 2;
Start page: 109;
Date: 2011;
Original page

Keywords: Picea abies | decline | drought | stress markers | ecophysiology

ABSTRACT
Today, we are facing the threat of fast decay of forest stands (so called modern decline) differing from the "classic" decay scenarios. Responding to the progressive worsening health condition of forests, not limited only to our country, there are emerging efforts to identify and eliminate the mechanism underlying this phenomenon. A frequently discussed issue in this context is the climate change -- one of the factors sharing in the decline of mostly the non-native, but also native spruce forest stands. The changes in soil moisture content and air humidity represent one of the supposed causes underlying the tree weakening and possibly leading up to a complete decay of entire forest stands. In this paper we discuss the physiological response of the assimilatory apparatus in spruce trees during the stemwood growth phase on the study plot Iviny. The research was carried out on a sample of six irrigated and six non-irrigated (control) trees. Oneyear-old needles sampled from each tree in 2009 were measured for photosynthetic rate, chlorophyll afluorescence parameters, pigments concentration and needle water potential. A continual monitoring of meteorological characteristics was carried out. The results of selected physiological parameters measured in the spruce stand on the study plot Iviny allow to conclude that no significant differences between the irrigated and the control spruce individuals were recorded.
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