Home – Home – Jornals – Contemporary Problems of Ecology 2007 number 2

A correlation between the high values of photosynthesis intensity in Pinus sylvestris L. and Picea obovata Ledeb. and definite combinations of weather conditions is investigated. It is shown that under the conditions of Baikal Siberia the maximal intensity of photosynthesis in conifers is observed under optimal soil wetting in early spring and during summer. The early spring maximum, which is observed at low soil temperature and high amount of accumulated water, can be much higher than the intensity of photosynthesis in summer. The summer maximum is observed after rains and heating of the lower soil horizons. The types of localization of the maxima of photolynthesis intensity observed under vegetation periods with different weather conditions are graphically marked out and characterized.