Biologische Krusten auf den Böden der Region Ouargla (Algerien)
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In Algerien nehmen gipshaltige B�den eine Fl�che von 7966,3 km ein, was einem Anteil von 3,3 % der Gesamtfl�che des Landes entspricht; die an diesen B�den durchgef�hrten Untersuchungen sind weitaus eher bodenkundlicher als mikrobiologischer Natur. Diese Arbeit ist eine quantitative und qualitative Untersuchung der Mikroorganismen, die in den Oberfl�chenkrusten einiger gips- und salzhaltiger B�den in einer W�stenumgebung (der Region Ouargla) leben. Die physikalisch-chemischen Analysen zeigen, dass die B�den von Ouargla eine sandige und lehmig-sandige Textur aufweisen. Die untersuchten B�den zeichnen sich durch einen geringen Feuchtigkeitsgehalt, einen hohen Salzgehalt und variable Gipsgehalte aus. Die Gehalte an organischer Substanz und Gesamtstickstoff im Boden sind gering. Die Vegetationsdecke ist sp�rlich und manchmal g�nzlich fehlend. Die B�den werden von einer vielf�ltigen Mikroflora besiedelt, die an die schwierigen Bedingungen der Sahara angepasst ist; die mikrobielle Biomasse und die Keimzahl variieren von Boden zu Boden. Die biologischen Krusten in der Region Ouargla sind aufgrund klimatischer Faktoren (Trockenheit) und biologischer Faktoren (Seltenheit und/oder Fehlen der Vegetationsdecke) wenig entwickelt.
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