Modification of The model of Influence of climatic factors on photosynthesis in the conditions of the south of Ukraine
Authors: Poliovyi A. , Kuznietsova Yu. 
Published: May 2020

The article describes the method of calculation of plant vegetation photosynthesis and its modification to the spikes in the South of Ukraine. The object of the study is the Tsyurupinsk forest-hunting farm, which is located in the Kherson region, on the Nizhnedneprovsky sands. Artificial forest in the Steppe zone of Ukraine is of interest as a factor influencing the climate of this area. The subject of the study is pine needles, which is dominant. The place of simulation is determined as the driving force behind the development of science. The existing modeling methods that are most often used in practice are described. Existing models of calculation of photosynthesis are presented and the second is specified сonsidered what are the models based and what results can be obtained for their use. Component of the method of calculation of vegetation photosynthesis, developed by Polevoy A. M, is demonstrated. The proposed method is implemented in Fortran language using standard agrometeorological information. The data can be used both for a single station and average characteristics for areas, regions and soil - climatic zones. The blocks of data necessary to calculate the intensity of photosynthesis are shown. The data necessary for the implementation of this model is drawn up. The modification of the method to the studs, which were chosen as the object of research, is described. For the subject of research, the pinholes of studs are chosen, because it is a productive assimilation apparatus. The calculations of this modification are shown in the form of tables. They allow us to see the influencing agrometeorological factors and the area, growth, photosynthesis of the research subject. The results of the simulation are presented separately for the Crimean pine and for the common pine. The average of the decade's effective temperature for this region of the study varied from 3,3 to 12,2 °C. The sum of effective temperatures with an increasing amount during the growing season of the needle increased from 36,3 to 517,5 °C. The average per decade intensity of the FAR over the shoots for both types of hairpins varied from 0,25 to 0,33 cal/cm2 min. For the decade, the intensity of the FAR in the shoots of the Crimean pine needles was from 0,12 to 0,5 cal/cm2, while in the pine usual 0,17-0,09 cal/cm2 min. The results of the calculation of the area, photosynthesis and growth of the needle pin are different. The area of the Crimean pine needles varies from 2,3 to 5 mm2, and the pine is usual from 0,9 to 2 mm2 during the first six decades. The difference in the area of the needles of the studied studs is 3 mm2. The intensity of photosynthesis under optimal conditions on the temperature and humidity of the soil for both studs is 1,2 СО2/dm2 h. The intensity of photosynthesis in the field conditions in the Crimean pine grows during the first three decades from 0,1 to 0,3 СО2/dm2 h., аnd in the pine common from 0,1 to 0,2 СО2/dm2 h. during the first four decades. Photosynthesis of shoots per day differs by 0,7 g/m2. The height of this indicator is observed during the first three decades: in the Crimean pine from 0,2 to 1,2 g/m2, and in the pine common from 0,1 to 0,5 g/m2. The indicator of the growth of the total mass of shoots for a decade in the Crimean pine increases from 2,1 to 8,8 g/m2, and in the pine usual from 0,8 to 3,5 g/m2. The growth of the Crimean pine needles is 5,3g/m2 larger. An analysis is made of the results obtained in the modification of the model for the calculation of photosynthesis. A conclusion is made on the success of the modification of the method for calculating vegetation photosynthesis to the hairpin.