Microorganisms population size of the soil organic layer and characteristics of the black locust litterfall (Robinia pseudoacacia L.) on the reclaimed soil of the Energy-Industrial Complex Kolubara [Serbia]
2010
Miletić, Z., Institute of Forestry, Belgrade (Serbia) | Stajić, S., Institute of Forestry, Belgrade (Serbia) | Golubović-Ćurguz, V., Institute of Forestry, Belgrade (Serbia)
The researches were conducted on the reclaimed miner soil formed by the deposition of the waste-rock from the open-pits of the lignite mines in three black locust monocultures. The total annual yield of the litterfall, organic carbon and nitrogen, as well as phosphorus and potassium, calcium and magnesium, was studied. The C/N ratio and hydrolized forms of nitrogen were determined. In the soil organic layer under the black locust culture the seasonal dynamics of the population size of the saprophitic microorganisms, which perform the important function in the nitrogen cycle in the forest ecosystems, was studied. Along with the black locust litterfall in the monocultures of these species, the native species have an important role in the formation of the soil organic layer, which provides the various energy material for the saprophitic microorganisms and create favourable condition for humus synthesis. The extremely high quantities of nitrogen, which is basic missing nutrient in the studied reclaimed soil, are present in the black locust litter. The products of the decomposition of the black locust leaves are the important source of the nutrients for the native species. Because of the characteristics of the black locust litter and light regime in the black locust stands, this species is very favourable for the use in the thick mixed plantations of the short rotation intended for the production of timber for the energy purposes. The products of the decomposition of the black locust litter and humus in the mixed plantations can improve the nutrition of the other species.
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