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The broadleave tree species have always been in the focus of attention of forest managers and owners because of valuable wood. Moreover, the presence of broadleaves increases the forest biological diversity. There is only a limited selection of tree species in Latvia ? the Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) Karsten), silver birch (Betula pendula Roth), pubescent birch (Betula pubescens Ehrh.), black alder (Alnus glutinosa (L.) Gaertn.), less represented - common ash (Fraxinus excelsi...

In the years 2011-2016 the effect of different agronomy practices on changes in topsoil qualities of Chernozem was studied. Soil quality refers to the ability of soil aggregates to resist dispersion. Two soil tillage treatments were established ? disc tillage and fallow. The locality is situated in the Mikulov district in a maize-growing region at an altitude of 350 m. The average annual temperature and precipitation was 9.6 °C and 524 mm, respectively. Local soils were characterized as medium-heavy Chernozem on l...

Arid ecosystems occupy large areas in the world and perform important ecological functions to maintain the biodiversity and stability of natural ecosystems. In this article, we present the results of the research on the change in the activity of catalase and dehydrogenases when the soils of the arid ecosystems of the Southern Russia are polluted by zinc: dark chestnut, chestnut, light chestnut, brown semidesert and sandy soil. Zinc was added to the soil in the amount of 300, 3,000 and 30,000 mg/kg (1, 10 and 100 m...

In Latvia, English oak Quercus robur L. planting material is grown both as bare-root seedlings and bare-root plants. Its breeding is difficult, because the quality of planting material is affected by both abiotic and biotic factors. Damage caused by various factors may be spread evenly and unevenly in the area of cultivating planting material. The most common damage to seedlings and plants can be observed already in the spring, when new leaves begin to flourish and new shoots develop. It is clear that differences ...