Optimal Environmental Factors and Photosynthesis Intensity of Scots Pine and Siberian Larch in the Baikal Region
G. G. SUVOROVA, L. S. YANKOVA, L. D. KOPYTOVA, A. K. FILIPPOVA
Abstract
Changes of maximal intensity of photosynthesis of Scots pine (Pinus silvestris L.) and Siberian larch (Larix sibirica Ledeb.) depending on the radiation intensity, air and soil temperature, air humidity and reserves of accessible soil humidity of the upper half-meter layer were studied. It is shown that optimal ranges within whose limits the highest values of photosynthetic activity are realized change both during the vegetation period and in years of various heat and moisture-providing levels. The species specificity of ranges is analyzed taking into account the peculiarities of water regime and components of carbon dioxide exchange - the true photosynthesis and respiratory activity of each species. The analysis of assimilation activity in "abnormal" season makes it possible to specify the notions of peculiarities of realization of the photosynthetic potential of conifers under natural conditions.
|
