Growth

Dörffling, Karl

doi:10.1007/978-3-642-71668-3_10

Cited by 4 publications

(2 citation statements)

References 146 publications

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“…Accordingly, K could be located in the cytoplasm in the cambial zone and could be transported into the vacuole during cell growth. Nevertheless, growth regulators (especially IAA) are of main importance for cell extension and have to be considered in discussing the increase of the radial cell diameter of the fertilized trees (Dörffling 1986;Aloni 1989). High Ca contents in the phloem of Picea abies were also registered by Rademacher (1986) and Alcubilla et al (1990).…”

Section: Element Content In the Cambial Zone During The Period May 19mentioning

confidence: 91%

Influence of Mineral Elements on Wood Formation of Old Growth Spruce (Picea abies [L.] Karst.)

Dünisch¹,

Bauch²

1994

HFSG

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The influence of mineral element supply on wood formation of old growth spruce (Picea abies [L.] Karst.) was investigated in relation to other exogenous factors, e.g. temperature, precipitation and suction force of the soil. At a 110 year-old spruce stand two plots (3300m 2 each) were selected for studying wood formation, one fertilized in 1986 with 98 kg K, 59 kg Ca and 128 kg Mg, the other unfertilized äs control. Wood increment, biomass production and mineral element content were investigated for selected trees of each plot. In addition, nutrient elements in the cambial region of two trees of each plot were quantified in monthly intervals from May 1991 to March 1992. During the Vegetation per i öd s 1990 to 1992 the influence of mineral element supply on cambial activity and cell differentiation was analysed intraannually. The distribution of mineral elements in the cambial region was investigated also on a subcellular level by Energy-Dispersive-X-Ray analysis (TEM-EDX) parallel to the lignification process studied by UV-spectroscopy. In 1991 the biomass production of the fertilized trees was 30% higher than those of the controls. Higher K, Ca and Mg contents were registered in different tree fractions of the fertilized trees, whereas N Contents were slightly reduced. The variability of the K and Ca contents in the cambial region was strongly related to ontogenetic factors. The fertilized trees showed a significant increase in periclinal cell divisions compared to the controls, which was mainly caused by an extended period of cambial activity of the fertilized trees. At the beginning of the Vegetation period the rate of cell division and the cell dimensions are strongly influenced by temperature, whereas at a later stage wood formation is mainly influenced by water availability. In periods with extreme precipitation deflcit the positive influence of fertilization on wood formation was stronger than in periods with high soil water content. At the beginning of lignification of the tracheids a strong decrease of the Ca content in the cell wall layers of the differentiating cells was observed.

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