Influence of soil moisture level on metabolism of non-structural carbohydrates in Quercus robur leaves

The long-term increases in average temperature and intensification of droughts which characterise the current state Earth’s climate system have a negative impact on forest ecosystems can lead to decrease their area deterioration living conditions components. In Ukrainian Steppe an important environmental, antierosion, water-protective soil-protective role belongs ravine forests. most valuable component forests is presented by natural populations common oak (Quercus robur L.), are able tolerate arid typical steppe region. But with global warming, endurance this species changing. It believed that significant plant adaptation drought high temperatures may belong non-structural carbohydrates. Therefore, it study changes concentration these substances leaves leading under action adverse hydrothermal conditions. article analyzes content dynamics soluble sugars (glucose, fructose, sucrose) starch Quercus L. different growth (hygromesophilic (CL2–3), mesoxerophilic (CL1) xerophilic (CL0)). research was conducted Viyskove (steppe zone Ukraine) thalweg at levels slope southern exposure. Content glucose, sugar determined. found when exposed increasing water stress during vegetation period (CL0–1) conditions, both glucose sucrose Q. becomes much higher than more optimal supply. At same time, disaccharide significantly monosaccharide. greatest amount observed driest months (July, August), for providing plants stressful. When grows increase correlated reduction content. has been fructose droughty growing comparable favourable moisture. September, there decline all forms carbohydrates variants compared previous month, especially do not affect nature robur, although they change quantitative indicators. Based protective function stressors plants, we assume lack moisture soil accumulation areas hygrotopes plays resistance.