INTERDECADAL DYNAMICS OF THE EFFICIENCY OF PHOTOSYNTHETICALLY ACTIVE RADIATION UTILIZATION IN THE FORESTS OF MESHHERA
Abstract
The efficiency of the utilization of photosynthetically active radiation (PhAR) during the vegetation periods of 1958–2008 is studied for the eight forest sites typical for the Central Meshhera region. The photosynthesis efficiency is thought of as a ratio between the energy assimilated in phytomass and the incoming PhAR during the vegetation period. The study revealed the synchrony of the interdecadal dynamics of photosynthesis efficiency between the zonal site types, except the intrazonal Ledum palustre / Carex vesicaria / Sphagnum pine forest site. During the study period all sites showed the certain intervals of the multidirectional trends of photosynthesis efficiency. The photosynthesis efficiency has a nonlinear relation with the average groundwater level in May-August; the optimal depth for the photosynthesis is 0,7–1,0 m. In hydromorphic sites the vegetation utilizes solar energy more effectively during the years with low precipitation, while in other sites the peaks of photosynthesis efficiency correspond to those of precipitation. This may be due to the geophysical and geochemical processes caused by rain water. The correlation between the annual values of the photosynthesis efficiency and the solar activity indices (the Wolf numbers) is insignificant.
About the Authors
K. N. Diakonov
Lomonosov Moscow State University.
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, Head of the Department, D.Sc. in Geography, Professor, Corresponding member of the RAS.
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, Head of the Department, D.Sc. in Geography, Professor, Corresponding member of the RAS.
A. S. Bajbar
Lomonosov Moscow State University.
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, student.
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, student.
T. I. Kharitonova
Lomonosov Moscow State University.
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, Associate Professor, PhD. in Geography.
Russian Federation
Faculty of Geography, Department of Physical Geography and Landscape Science, Associate Professor, PhD. in Geography.
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Review
For citations:
Diakonov K.N., Bajbar A.S., Kharitonova T.I. INTERDECADAL DYNAMICS OF THE EFFICIENCY OF PHOTOSYNTHETICALLY ACTIVE RADIATION UTILIZATION IN THE FORESTS OF MESHHERA. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2017;(5):12-23. (In Russ.)
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