Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.593438
Title: The effects of deep forest ploughing on soil physical properties, nutrient mobilisation and tree root development
Author: Simpson, Thomas George
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1987
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Abstract:
The effect of deep ploughing indurated upland soils to 90cm was investigated at three sites in North East Scotland. The sites varied in age from recently ploughed to sixteen years old. The profile morphology, disruption of induration and change in rootable volume, the maximum depth of root extension, and root orientation were quantified. The soil moisture regime was monitored over one growing season at Glenbuchat using a series of tensiometers inserted horizontally into the profile face. The deeply buried organic matter remained moist throughout the summer. In contrast organic matter near the surface underwent fluctuating cycles of wetting and drying. The deeper soils showed little response to summer rainfall. The rate of decomposition of the buried organic matter was assessed in three ways. A litterbag study determined the effect of burial on weight loss, nutrient element loss and microbial activity. Anaerobic incubations were used to measure rates of nitrogen mineralisation and the concentration of 'Klason' lignin were used as an indice of decomposition of buried organic matter. At Glenbuchat there was a significant decrease in mineralisable nitrogen and lignin concentration with depth. In contrast the older site at Culloden had the opposite trend with a significant increase with depth. This later result was thought to be due to the death and decay of fine roots.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.593438  DOI: Not available
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