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Crittenden, PD/ Kershaw, KA 1979: Studies on lichen-dominated systems. XXII. The environmental control of nitrogenase activity in Stereocaulon paschale in spruce-lichen woodland. - Canadian Journal of Botany 57: 236-254. [RLL List # 103-16 / Rec.# 3700]
Keywords: STEREOCAULON/ NORTHWEST TERRITORIES/ CANADA/ NITROGENASE/ NITROGEN FIXATION/ SEASONALITY
Abstract: 4 tables. 12 figures. [Study conducted on samples from Northwest Territories, Canada, showed that "...while nitrogenase activity in S. paschale at any point in time was dependent upon concurrent environmental conditions, it also was strongly influenced by pretreatment: both winter frost and thermal stress during summer droughts impeded recovery of nitrogenase activity following the onset of ameliorative conditions. It is suggested that a large fraction of the total annual N assimilation by S. paschale in drier, continental subarctic habitats may be achieved in summer during a few comparatively short episodes of suitable moisture conditions."]

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