The article shows the results of the influence of different concentrations of allelochemicals of Acer negundo L. leaf litter, germination energy, absolute germination of seeds and plant growth. The seeds of Raphanus sativus L. and Avena sativa L. were used as model objects. Active substances contained in leaf litter A. negundo, have a selective inhibitory effect on the germination of seeds and the growth of seedlings of monocotyledonous and dicotyledonous plants. The allelopathic effect of the fall is not a limiting factor for the germination of seeds of herbaceous plants of the above-ground cover of the studied plantation.
The possibility of using chemical and mechanical methods to control the undesirable growth of the invasive species Acer negundo L. at the expositions of the Main Botanical Garden of the Russian Academy of Sciences, which has the status of a specially protected natural area, was studied. It was found that treatment of freshly cut stumps of A. negundo with glyphosphate in concentration of 7.2 g/l causes death of 65% of plants. In the rest of the specimens of A. negundo from this option the amount of growing epicormic sprouts decreased by 5.2 times in comparison with the usual cutting (control).
On the territories of Moscow, Acer negundo L. (ash-leaved maple) occupies large areas and is one of the first places in terms of quantity among other species. It is recognized as an alient invasive breed for Central Russia. Invasive species pose a threat to natural flora, therefore, their distribution and number must be controlled. There are decrees for the removal of this breed in Moscow, but the number of plants in the city does not decrease, and new specimens continue to be planted. The article discusses the features of the legislation regarding the removal of A.negundo as an invasive species on the territories of the green fund of Moscow, as well as the biological features of this species that complicate the removal of specimens and the management of its coppice and seed renewal. According to the regulations established in Moscow, in the territories occupied by green plants, since the ash-leaved one should be gradually removed from the territory, since old specimens are gradually cut down (if they are affected by diseases and pests, dead or emergency), do not plant new trees of this species recommended. In practice, the number of trees does not decrease, and the rapid growth of self-sowing leads to the fact that in a short time the self-sown plant goes into the category of “tree”, which cannot be removed. In natural areas, for A.negundo, felling, uprooting, annual removal of growing shoots and of juvenile specimens are envisaged. Due to biological characteristics (multi-trunk, extensive root system, high ability to grow overgrowth after cutting the trunk, high germination of seeds and their spread over long distances), these measures for the removal of the species are insufficient. In particular, uprooting leads to a violation of the integrity of the biocenosis, and often it is impossible to carry out it. Without the development of a complex of forestry and chemical control measures, the withdrawal of the invasive species A.negundo from the plantations is impossible.
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