METHOD OF EVALUATING TROPHIC STATUS OF ECOSYSTEMS OF MINERALISED LAKES ON LEVEL OF DEVELOPMENT OF AQUATIC COMMUNITIES

摘要

FIELD: agriculture.;SUBSTANCE: invention relates to the field of ecology and hydrobiology and is designed to assess the trophic status of ecosystems of mineralised lakes. In assessing the trophic status of the lake ecosystem with water mineralisation over 3 g/dm³ according to the level of development of aquatic communities the negative effect of mineralisation level is taken into account by calculating the amount of lost biomass using the obtained empirical dependence and its approximation in the form of a power function of the form:; $В\text{'}=k_1\cdot X^{k2},\text{ (1)}\mathop{\mathrm{image}}$ ;where B' is the estimated biomass, X is water mineralisation, and k₁ and k₂ are empirical coefficients. ; $Вр=В\text{'}\text{'}-В\text{'},\text{ (2)}\mathop{\mathrm{image}}$ ;where Bp is potentially lost biomass with increasing mineralisation, B'' is estimated biomass with mineralisation of 3 g/dm³. From equations (1) and (2) the potential biomass is determined that would be in the absence of inhibitory effect of mineralisation as follows: ; $Вm=Вav+Вр,\text{ (3)}\mathop{\mathrm{image}}$ ;where Bm is potential biomass in the absence of inhibitory effect of mineralisation, Bav is average biomass in the foreshore of the water reservoir.;EFFECT: invention enables to estimate the real trophic status of lake ecosystems under the influence of natural and anthropogenic factors and to predict the biomass of aquatic communities when change in the water mineralisation of lakes.;1 dwg, 1 ex