Development of invasive species Canadian goldenrod (Solidago canadensis L.) in Vetka and Chechersk districts of Gomel region

Currently, invasive aggressive plant species represent an ecological threat to the natural complexes of Belarus, their stability and functioning. At present time, studying the issues related to the introducing of these species into natural communities is very important. The results of studying of the invasive species Canadian goldenrod showed that individuals were in the immature, virgin and generative states in the studied objects. Individuals of seed origin that reached a height of 8 to 12 cm. In the vegetative type of reproduction, they reached a height of 90-110 cm. The height of some generative individuals was 1.8 m, the diameter of the shoot varied from 0.3 to 0.8 cm. The length of the leaves in the upper formation was 4-7 cm, width 1.4-1.8 cm, interstices 0.7-1.9 cm. The invasive species Canadian goldenrod spreads rapidly due to active propagation both by seeds and vegetatively. Individuals quickly reach a generative state. They are characterized by many generative shoots that produce a huge number of seeds and thereby maintains the population''s stability under natural conditions. There are individuals from the immature to the old generative states. In 2017, compared with 2016, there was an increase in individuals in populations from 0.4 to 14.3 individuals/m2. Research methods: population-ontogenetic, ecological-floristic, biometric.