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Aboveground litterfall fluxes of selected elements in central European temperate forest
Bašta, Jan ; Oulehle, Filip (advisor) ; Chuman, Tomáš (referee)
5 Abstract Aboveground litterfall is the most important intrasystem flow in the temperate forest ecosystem. It is also the largest input flux to the soil surface for most of the macronutrients (N, P, Ca, Mg, K). However, under Central European conditions, studies on the magnitude of this flux in relation to elemental stocks are lacking. GEOMON Small Forest Catchment Network is used to investigate long-term trends in nutrient cycles in temperate forests of Central Europe and the human influence on them. As part of this network aboveground litterfall collectors were placed in 14 catchments at a total of 19 sites at the end of 2019. Litterfall was then collected bimonthly, weighed and sorted into different fractions. These fractions were analyzed to determine the concentration of the elements of interest. From these values, the fluxes of the elements in the aboveground litterfall were calculated. The observed values were compared with the characteristics of the individual sites and the element budgets in the catchments. The monitored elements can be ranked according to the size of the flux of the element through the aboveground litterfall in relation to other inputs of that element to the soil as follows: C, P, N, Ca, Mg and K. The average amount of aboveground litterfall in the GEOMON network is 4.6...
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Methane emissions from temperate freshwater reservoirs
Bašta, Jan ; Frouzová, Jaroslava (advisor) ; Rulík, Martin (referee)
Methane (CH4) emissions from temperate freshwater reservoirs have only been evaluated for the last several decades. Freshwater ecosystems (including water reservoirs) release crucial quantities of this important greenhouse gas. Ebullition that releases methane into the atmosphere from bubbles originating from sediment is important source of methane. Regardless of the importance of these emissions, a very limited number of scientific research papers monitoring this flux into the atmosphere are available. Estimated values of methane emissions from freshwater temperate reservoirs vary considerably. There are many different methods for monitoring methane emissions. It seems that the freshwater reservoir stimulates methane formation in increasing scales. The size of the sum of methane emitted from freshwater reservoirs is also difficult to say.
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Purchasing management in logistics of a trading company
Bašta, Jan ; Cimler, Petr (advisor) ; Zeman, Jiří (referee)
The final thesis analyzed the position of purchase in logistics of a trading company, moreover there are analysis focused on processes that take place in the purchasing management in this company. The aim of final thesis is to improve current system. This fact will lead to optimization of processes and activities in procurement.
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