Impact of climate change on productivity of ecosystems of the Polissya zone of the Ukraine

Abstract

Climatic parameters that cause changes in the productivity of ecosystems in the Polissya zone of Ukraine have been identified, and the degree of their impact on bioproductive processes has been assessed. The result of the research is the coefficients of correlation and determination, which indicate the presence or absence of a linear connection between indicators, their nature and the degree of dependence of the variation of the dependent indicator on the variation of independent variables. According to the results of the analysis, the indicator of net primary productivity has a strong connection with the indicator of solar insolation. It has been proven that the length of daylight and the level of solar radiation are the driving force behind changes in the growth of primary products, as floral forms are one of the first indicators of changes in ecosystems due to global warming. The group of climatic components that have a moderate connection with the bioproductivity of ecosystems of the Polissya zone are derivatives of bioclimatic indicators related to air temperature, including annual temperature, seasonality, minimum temperature of the coldest month, and the average temperature of the coldest quarter. Seasonality and the annual variation of temperature affect bioproductive processes inversely: with the increase of the temperature range between the warmest and coldest periods of the year and in the middle of quarters the productivity decreases. The minimum temperature of the coldest month of winter is critical, as a directly proportional effect on productivity is recorded. There is no influence on the growth of biomass of the main and derivative indicators of precipitation and maximum temperature in July, which is explained by the sufficient soil moisture in the region, the developed river network and the predominance of floodplains.