Topographic thresholds for plant colonization on semi-arid eroded slopes

摘要: Soil erosion plays an important role in plant colonization of semi-arid degraded areas. In this study, we aimed at deepening our knowledge the mechanisms that control on eroded slopes east Spain by (i) determining topographic thresholds for colonization, (ii) identifying soil properties limiting establishment and (iii) assessing whether colonizing species have specific traits to cope with these limitations. Slope angle aspect were surrogates rate water availability, respectively. Since availability can limit both interact landscape, analysed variations success (vegetation cover number) slope 156 slopes, as a function aspect. After was sampled near threshold values analysis [nitrogen, phosphorous, calcium carbonate (CaCO3), holding capacity]. Plant expressing capacity pool steep just below inhabiting gentler absent from threshold. Results show decreased north south. For vegetation cover, 63°, 50°, 46°, 41° north, east, west south classes, respectively, 65°, 53°, 49° 45° richness same classes. No differences existed among aspects between positions (just above threshold) within This suggests classes result plants which is controlled availability. Long-distance dispersal mucilage production preferably associated species. These results are discussed perspective more efficient ecological restoration ecosystems where acts filter establishment. Copyright © 2009 John Wiley & Sons, Ltd.