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Contemporary Problems of Ecology

2004 year, number 1

Specific Features of the Changes in Daily Photosynthetic Productivity of Conifers. II. Siberian Spruce and Pine

G. G. SUVOROVA, A. S. SHCHERBATYUK, L. S. YAN’KOVA

Abstract

The dependencies of daily photosynthetic productivity of the Siberian larch on total daily illumination, air temperature averaged over the photosynthesis period, soil temperature at the depth of 5 cm, and amount of moisture accumulated in the upper half-a-meter layer of soil are analyzed. The dependence on the environmental factors was found to be substantially different in spring and in the summer-autumn period: in spring spruce requires sufficient moisture content of soil and sufficient illumination; for pine, the dependence on soil temperature was revealed. In summer and in autumn, spruce is shade- and moisture-requiring while pine exhibits the features of a xerophyte. The importance of these features in vital functions of plants is discussed.