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dc.contributor.author Harrison, YA en_US
dc.contributor.author Shackleton, CM en_US
dc.date.accessioned 2007-03-28T08:53:47Z en_US
dc.date.accessioned 2007-06-07T10:07:27Z
dc.date.available 2007-03-28T08:53:47Z en_US
dc.date.available 2007-06-07T10:07:27Z
dc.date.copyright en_US
dc.date.issued 1999-05 en_US
dc.identifier.citation Harrison, YA and Shackleton, CM. 1999. Resilience of South African communal grazing lands after the removal of high grazing pressure. Land Degradation & Development, vol. 10(3), pp 225-239 en_US
dc.identifier.issn 1085-3278 en_US
dc.identifier.uri http://hdl.handle.net/10204/2157 en_US
dc.identifier.uri http://hdl.handle.net/10204/2157
dc.description.abstract A paired site study was conducted of communally grazed eutrophic and dystrophic grasslands and adjacent ungrazed areas of varying periods of exclusion from communal grazing. This allowed determination of the rate and extent of change of a number of vegetation and soil variables following the removal of high and continuous grazing pressure characteristic of communal lands. Similarity indices for grass species composition between the grazed and adjacent ungrazed areas showed a significant exponential decrease with increasing time since protection from continuous grazing. Most change in grass species composition occurred within four to nine years of protection from communal grazing in eutrophic grasslands, and in six to nine years in dystrophic grasslands. In both grassland types palatability increased with time since protection. In eutrophic sites the abundance of perennials showed a significant increase with time since protection, while the abundance of annuals showed a concomitant decrease. This relationship was not evident in dystrophic grasslands. Grass species diversity, basal cover and density showed no relationship with time since protection in the eutrophic sites, but a general increase with time since protection was found in dystrophic sites. Soil bulk density, field capacity, pH and soil nutrients showed no evidence of a relationship with time since protection for either grassland type, while soil porosity increased significantly with time since protection at eutrophic sites, but not dystrophic sites. These relatively rapid changes following the removal of the high grazing pressure indicate that these systems are characterized by relatively high resilience. en_US
dc.format.extent 182162 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en en_US
dc.publisher John Wiley & Sons Ltd en_US
dc.rights Copyright:1999 John Wiley & Sons, Ltd. en_US
dc.source en_US
dc.subject Communal grazing lands en_US
dc.subject Degraded lands en_US
dc.subject Rapid changes en_US
dc.subject Resilience en_US
dc.subject South Africa en_US
dc.subject Enviromental sciences en_US
dc.title Resilience of South African communal grazing lands after the removal of high grazing pressure en_US
dc.type Article en_US


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