Paprastojo išplautžemio savybių pokyčiai ir fitocenozių produktyvumas kintant žemėnaudai ; Changes of Haplic luvisol properties and productivity of phytocenoses with altering land use

Abstract

Research relevance. Sustainable land use is an agroecosystem which aims to gain pro-ducts that, by their amount, could compete with production obtained on land of at least ave-rage productivity, and could maintain stable soil productivity or even improve it in case of selected specific land uses and grown crops. Low-productivity light textured soils are risky for cultivation of agricultural products. So the exploration on rational use of resources in such soils requires special attention. Sandy loam soils are naturally infertile and acidic, with low content of organic matter, so the importance and aspiration to conserve or improve such soils is enshrined in legislation such as the National Climate Change Management Policy and the National Environmental Protection Strategy. The Kyoto Protocol emphasizes that soil is one of the main CO2 reser-ves, which must be protected and, if possible, increased. At the Paris Conference on Climate Change the member states pledged to achieve the so-called "absolute zero" threshold as quickly as possible, and to reach the balance of pollutants and green energy which would not further extend the greenhouse effect by 2100. It was noted that certain farming techniques allow agricultural soils to absorb and perform carbon sequestration, enabling the assessment of land use conversion efficiency (Huang et al., 2010, 2012; Jin et al., 2014). Research objectives: 1. to determine changes of macromorphological characteristics of the soil profile (0–120 cm) resulting from the altered land use; 2. to explore the impact of different land uses on soil fertility, assessing changes of agro-chemical characteristics of soil profile (0–120 cm); 3. to assess differences in organic carbon sequestration in different land uses; 4. to assess the productivity (biomass, total energy) of different land uses and their altera-tions depending on the duration of the land use transformation period; 5. to identify changes in the species composition of natural phytocenoses (fallow) in the course of soil renaturalization.