Abstracts

For testing the response of plantlets of conifers to soil moisture variation the neighbouring plots with balanced soil background, with isolating from precipitation and side filtration have been established. Four variants of water supply conditions for model trees were created according to the experiment at the level of soil-hydrological constants: 1 – wilting point (WP) or difficult accessible water, 2 – capillary moisture capacity (CMC) or mid-accessible water, 3 – field moisture capacity (FMC) or easily accessible water, and 4 – control variant. Required conditions of different soil water regimes were achieved by assessing of water deficit and watering norm calculation for each variant of experiment during the vegetation period.

Analysis of annual height increments showed that the most increments of Scots pine, Siberian spuce, Siberian larch are noted in the variant with easily accessible moisture. Annual increments of Siberian spruce plantlets in the variants of easily accessible moisture and control differ more than in variants of Scots pine and Siberian larch. This is the evidence of high need of spruce for soil water. For Siberian stone pine the optimal variant for height growth is the variant with mid-accessible water and control variant. It reflects the ecological specificity of this species.

Different response of species under created dry conditions is observed for wood anatomical features forming. Plantlets of Siberian stone pine and Siberian larch are found to be the most sensitive to dry conditions of the experiment – in the variant with mid-accessible water (CMC) and especially in difficult water availability (WP). Significant decrease of parameters of all anatomical features is observed in the year of experiment in comparison with the previous year. In conditions of easily accessible water(FMC) the trees of all species have similar response which appears in increasing of tree ring width, cell number, cell wall thickness, tracheid radial diameter in comparison with parameters of these features before experiment start.

The work was made under financial support of RFBR № 07-04-00292.

Note. Abstracts are published in author's edition

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