The structure and species composition of communities of 9 areas within the city of Tobolsk (Tyumen region, Russia) and its surroundings were studied. The method used to assess the quality of the environment consisted in determination of the fluctuating asymmetry index of the Betula pendula Roth lamina. For spatial characterization of the state of the test object and assessment of the anthropogenic load, a bioindication map was drawn up using isolines. The environmental heterogeneity of environmental conditions and the degree of deviation from the environmental optimum were revealed. During the examination of groups of individuals, insignificant fluctuations in the nature of environmental conditions from conditionally normal (I point) to critical (V points) were noted. Such fluctuations are explained by the uneven distribution of pollution sources between the compared territories. It was established that under conditions optimal for a species, the smallest level of deviations from the norm is observed, and that the territory under study is heterogeneous in terms of the fluctuating asymmetry index.

研究了托博尔斯克市（俄罗斯秋明州）及其周边地区9个地区的群落结构和物种组成。用于评估环境质量的方法包括确定白桦的波动不对称指数罗斯层。对于测试对象状态的空间表征和人为负荷的评估，使用等值线绘制了生物指示图。揭示了环境条件的环境异质性和偏离环境最优的程度。在对个体群体进行检查期间，注意到环境条件的性质从条件正常（I 点）到临界（V 点）的波动很小。这种波动的原因是比较地区之间污染源的分布不均。已经确定，在一个物种的最佳条件下，观察到与标准的最小偏差，并且研究的区域在波动的不对称指数方面是异质的。