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