Enzymatic and microbiological activity of the soil under the influence of <i>Acer negundo</i> L
The study of the enzymatic and microbiological activity of the soil was carried out in Acer negundo L. plantations (ash-leaved maple), located on former arable land within the city of Kemerovo (55°21′55″ N; 85°09′45″ E). The registration sites are located within the projection of the Acer negundo crowns in the sub-crown and under-crown zones: I - single trees in non-closed stands; II - stands with medium crown closeness; III - stands with high crown closeness. The external zone of single trees was selected as control. The soil of the studied sites was characterized by a neutral and slightly alkaline reaction of salt extract, an average supply of mobile forms of phosphorus, and a low content of nitrate nitrogen. The authors of the article noted an increase in the enzymatic and microbiological activity of the soil during the period of active plant growth, by the end of the growing season - their decrease. Allelopathically active substances of ash-leaved maple released into the soil did not significantly affect the indicators of biological activity of soils, especially in areas with high crown closeness. Some features of the biological activity of soils in maple plantations have been established: an increase in the number of microorganisms involved in the transformation of nitrogen mineral compounds and invertase activity, a decrease in the number of microscopic fungi and the activity of protease and phosphatase.