Influence of Acer negundo L. on overgrowing of laylands of suburban territories

The work purpose as a research of ekological-cenotic structure of plantings Acer negundo L. as indicator of transformation of communities on the former processed lands. Researches were conducted in inundated territories in suburbs of Kemerovo on which garden associations and personal plots were located more than 30 years ago. The middle-aged plantings of A. negundo having various crown density are chosen as objects of a research: not close, middle-close and high-close. Selection of the trial areas is carried out taking into account horizontal differentiation of space on internal, transitional and external zones of phytogenous fields. Geobotanical descriptions are carried out by standard methods, the taxonomical and ekological-cenotic structure of a ground cover is defined. In total 49 species of the higher plants which belong to 47 genus and 21 families are noted, zone distribution of types on a rank of families is established. The greatest specific abundance is noted for external zones of non-close plantings - 25 species, the smallest - for internal zones of high-close plantings. In non-close plantings recovery successions proceed on meadow type with a considerable delay in the transitional and the internal zones of trees where weed and invasive species are localized. In the middle-close plantings preservation of a projective covering of Poa angustifolia L. is noted up to 50%, but there is a considerable impoverishment of specific structure. In high-close plantings groups forest prevail and the ruderal species, however in addition of a live ground cover Humulus lupulus L. and Urtica dioica L. which not only are steady against joint growth under cover of A. negundo have major importance, but also supplement its role as transforming look that leads to formation of the simplified communities in a metastable state during vaguely long term.