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Sediment samples were collected during four years from two plots, one covered by natural vegetation and the other, a ''replica'' of the same plot, from which the vegetation was removed manually (disturbed plot), in order to evaluate the effects of vegetal cover on sediment particle size distribution. Particle-size was measured using a Coulter LS130 laser diffraction device. The effective size distribution...
Inappropriate land use is one of the main reasons for soil erosion and nutrient loss in the hilly loess area. In the Yangjuangou catchment, which has typical hill and gully topography, the effects of land use changes on soil erosion and the distribution of soil nutrients and moisture were studied at the three spatial scales of total catchment, transect and land use type. Between 1984 and 1996, forest...
The paper describes the application of caesium-137 measurements for estimating soil erosion rates in a small catchment in the Three Gorges region of the Yangtze River, China. The construction of the Three Gorges Dam has drawn attention to the impact of erosion and sedimentation, but there are relatively few quantitative estimates of sediment transfer for this area. The suitability of the fallout radionuclide,...
Badland landforms, created in Plio-Pleistocene clay landscapes of the Basilicata region of southern Italy, form marginal features in a semi-arid landscape dominated by the widespread cultivation of subsidised cereals. These badland features are high relative relief forms exhibiting a high drainage density and steep slopes, with slope angles typically in excess of 35 o . Economic incentives...
The implementation of soil and water conservation structures in semiarid areas, usually poses a difficult design problem. This is, in large part, due to the high variability of rainfall and the huge potential impact of extreme hydrologic events on structures and on the landscape in general. Magnitudes of runoff and soil loss or sedimentation rates in those environments are better not assessed by conventional...
Geomorphodynamic and pedogenetic processes were studied in a dry valley (the Borten Valley) within a typical loess region near Heilbronn. Land use in this area is very intensive and causes serious soil erosion problems. Soil mapping showed the degree of erosion of Luvisols and the resulting mosaic of different erosion and accumulation patterns. Soil profiles on slopes have been eroded and soils with...
Weathering and soil formation rates are regarded as the main criteria of a tolerable soil loss. The efficiency of weathering in the seasonal semiarid tropics has often been greatly over-estimated especially in the geomorphologic literature in which weathering is assumed to be as fast or even faster than surface erosion. Six selected ''Red Soils'' in two intramontane basins of hyperthermic SW Nepal...
Environmental magnetism, elemental chemistry, pollen, macrofossil, and radioisotopes were studied on top-metre cores from Ballydoo Lough, Connemara, western Ireland, to reconstruct the impact of changing farming practices on soil erosion in a lake catchment. Documentary evidence, including detailed agricultural statistics, gave an independent land-use history over the period represented in the sediment...
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