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Grassland in most cases is a man-made ecosystem. It covers large areas as a result of logging and slash-and-burn agriculture. It is maintained by regularly burning and cattle grazing. In contrast to forests, they contribute only insignificantly to soil preservation, water cycling, and production of regenerative resources and conservation of biodiversity. Regeneration to closed forest is possible passing through a stage of pioneer trees, when degradation of soils is not too severe and sources of seeds are not too far away. Natural regeneration can be enhanced by active reforestation. Tropical grassland is often referred to as savanna, which is defined as a vegetation form that denotes a continuous graminoid stratum, more or less interrupted by trees or shrubs. Edaphic and climatic savannas can be distinguished, according to the factors that cause their existence. Poor nutrient content of the soils and too much or too little water hamper the succession into forest in natural grasslands.