Search results for "soil crusting"

showing 2 items of 2 documents

Características de las costras físicas y biológicas del suelo con mayor influencia sobre la infiltración y la erosión en ecosistemas mediterráneos

2010

28 páginas, 4 figuras, 5 tablas.

Costra biológicaSoil textureRunoffBiological soil crustSoil scienceSoil crustinglcsh:QH540-549.5semiáridoGeomorphologyQH540-549.5Ecology Evolution Behavior and SystematicsSemiaridEscorrentíaTotal organic carbonCostra físicaEcologycostra biológicaescorrentíaerosiónBiological soil crustsCrustSemiáridoAridErosiónSoil materialInfiltration (hydrology)Erosionlcsh:EcologyPredictive variablesSurface runoffGeology
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Evolution des paysages Sahélines au cours des six dernières décennies dans la région de Niamey : de la disparition de la brousse tigrée à l'encroutem…

2010

In the Sahel, the rapid increase of the population during the last decades and the climate variation lead to an important environmental degradation. This work aims to measure the impacts of the human pressure on ecosystem during the six last decades. A diachronic cartography of a 100 km² area close to Niamey was done with aerial photographs (1950 and 1975) and GPS measurements (2009). Results showed that the tiger bush vegetation was completely cleared between 1950 and 2009 while the fallow decreases from 7 % to 1 %. In the sandy valley, the increase of cultivated fields from 20,7 % (1950) to 69,4 % (1975) favoured wind and water erosions which allowed surface soil crusting. Between 1975 an…

région de Niameyhuman pressureaerial photographsphotos aériennesSahel[SDU.STU] Sciences of the Universe [physics]/Earth Sciencessoil crustingsoils degradation[SDU.STU]Sciences of the Universe [physics]/Earth Sciencesdégradation des solspression anthropiqueencroûtement SahelNiame
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