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ABSTRACT:The landscape on southern exposed hillsides in the inneralpine Vinschgau Valley (Northern Italy) is shaped by many thousand years of cultivation. Phases of intensive land use and deforestation were followed by phases of natural regeneration and later by governmental programs of reforestation. The result in the present landscape is the juxtaposition of reforested woodland (RF-areas) and xeric grassland with steppe species (XG-areas) on the same hillside. The scenic and ecological contrast presents ideal conditions for comparative studies in ecology, forest and soil science. On the side of soil science especially the depth and intensity of soil development on the whole hillside have been underrated, whereas the existence of podzolised soils in the reforested area has mostly been overrated so far. One aim of this study was to investigate differences in the development of soils. A further aim was the comparative investigation of the recent hydrological and physical properties as well as the present dynamics of the hillside soils. With regard to that some results of the field and laboratory studies are presented which are contradictory to results of other studies concerning this region.

The floodplain vegetation of the Tarim River in Northwest China is strongly influenced by irrigated agriculture. The abstraction of river water disturbs the natural dynamics of the floodplain ecosystem. The human impact on the hydrological system by bank dams and the irrigation of cotton plantings have caused adverse changes of the Tarim River and its floodplains, so the current stocks of the typical Tugai vegetation show significant signs of degradation. Field studies of soils and statistical analysis of soil moisture data have shown that the vitality of the Tugai vegetation is primarily determined by its position to the riverbank and the groundwater. There exist complex interactions between soil hydrological conditions and the vitality of the vegetation. But the availability of water is not only influenced by the groundwater level and seasonal flood events. The spatial distribution of stocks at different states of vitality seems also to be decisively influenced by physical soil properties. Our results show that the water supply of plant communities is strongly influenced by the soil texture. Spatial differences of soil moisture and corresponding soil water tensions may be the decisive factors for the zonation of vegetation. Physical soil properties control the water retention and rising of capillary water from deeper soil layers and the phreatic zone and may supply the root systems of the phreatophytic vegetation with water.

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