Modeling of critical lead loads on natural ecosystems of Belarus

We give an outline of the model of behavior of heavy metals in terrestrial ecosystems and present the results derived from implementing it in estimating critical lead loads on natural ecosystems of Belarus. We provide the main methodological approaches, the algorithm, the composition of input information, the soil-geochemical, biogeocenotic, hydrological-climatic and other parameters used in the study as well as starting cartographic information. We provide the results of calculations in terms of the model as well as the maps of critical lead loads on the main types of natural terrestrial ecosystems of Belarus according to the effect-oriented and preservation approaches and demonstrate some cases where the existing levels exceed the calculated load standards.