A Conceptual Model of Arid Rangeland Degradation

Milton, Suzanne J.; Siegfried, W. R.

doi:10.2307/1312204

Cited by 295 publications

(138 citation statements)

References 37 publications

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“…The development of threshold and resilience concepts and STMs for categorising woodland expansion and evaluating natural disturbances or management applications has been a building process since the late 1980s (Archer 1994;Milton et al 1994;Briske et al 2008;Petersen et al 2009). Several detailed STMs have been proposed for describing the expansion of J. occidentalis Hook.…”

Section: Introductionmentioning

confidence: 99%

Sagebrush steppe recovery after fire varies by development phase of Juniperus occidentalis woodland

Bates

Sharp

Davies

2014

Int. J. Wildland Fire

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Abstract. Woodland ecosystems of the world have been changed by land use demands, altered fire regimes, invasive species and climate change. Reduced fire frequency is recognised as a main causative agent for Pinus-Juniperus L.(piñon-juniper) expansion in North American woodlands. Piñon-juniper control measures, including prescribed fire, are increasingly employed to restore sagebrush steppe communities. We compared vegetation recovery following prescribed fire on Phase 2 (mid-succession) and Phase 3 (late-succession) Juniperus occidentalis Hook. (western juniper) woodlands in Oregon. The herbaceous layer on Phase 2 sites was comprised of native perennial and annual vegetation before and after fire. On Phase 3 sites the herbaceous layer shifted from native species to dominance by invasive Bromus tectorum L. (cheatgrass). After fire, shrubs on Phase 2 sites were comprised of sprouting species and Ceanothus velutinus Dougl. (snowbrush). On Phase 3 woodland sites the shrub layer was dominated by C. velutinus. The results suggest that Phase 2 sites have a greater likelihood of recovery to native vegetation after fire and indicate that sites transitioning from Phase 2 to Phase 3 woodlands cross a recovery threshold where there is a greater potential for invasive weeds, rather than native vegetation, to dominate after fire.

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Section: Introductionmentioning

confidence: 99%

Sagebrush steppe recovery after fire varies by development phase of Juniperus occidentalis woodland

Bates

Sharp

Davies

2014

Int. J. Wildland Fire

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“…This approach presents challenges because it requires definition of these states (e.g. Milton et al 1994), a process which is not formally established in the SANParks planning environment. In addition, the TPC approach requires various types of information, for example a definition of (1) species diversity, (2) population size, (3) temporal and/or spatial changes in populations and (4) an assessment of whether such changes are within the (established or predicted) TPC.…”

Section: The Sanparks Contextmentioning

confidence: 99%

From numbers to ecosystems and biodiversity: A mechanistic approach to monitoring

Ferreira

Deacon

Sithole

et al. 2011

Koedoe

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Diverse political, cultural and biological needs epitomise the contrasting demands impacting on the mandate of the South African National Parks (SANParks) to maintain biological diversity. Systems-based approaches and strategic adaptive management (learn by doing) enable SANParks to accommodate these demands. However, such a management strategy creates new information needs, which require an appropriate analytical approach. We use conceptual links between objectives, indicators, mechanisms and modulators to identify key concerns in the context of and related to management objectives. Although our suggested monitoring designs are based mostly on defined or predicted underlying mechanisms of a concern, SANParks requires inventory monitoring to evaluate its key mandate. We therefore propose a predictive inventory approach based on species assemblages related to habitat preferences. Inventories alone may not always adequately serve unpacking of mechanisms: in some cases population size needs to be estimated to meet the information needs of management strategies, but actual population sizes may indirectly affect how the species impact on other values. In addition, ecosystem objectives require multivariate assessments of key communities, which can be used in trend analysis. SANParks therefore needs to know how to detect and define trends efficiently, which, in turn, requires precision of measures of variables. Conservation implications: Current research needs with regard to monitoring should focus on defining designs to yield optimal precision whilst taking methodology, survey trade-offs and analytical approaches into account. Use of these directives and research will guide monitoring during evaluation of SANParks objectives at various scales.How to cite this article: Ferreira, S., Deacon, A., Sithole, H., Bezuidenhout, H., Daemane, M. & Herbst, M., 2011, ‘From numbers to ecosystems and biodiversity: A mechanistic approach to monitoring’, Koedoe 53(2), Art. #998, 12 pages. doi:10.4102/koedoe.v53i2.998

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“…4,5,9,[46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64] This new technology in oil water separations is also being applied now to newer onshore fields to meet the onshore disposal criteria. 47,54,[58][59][60] Different technologies that are being employed in the industry for oil/water separations are:…”

Section: Chapter II Background and Literature Reviewmentioning

confidence: 99%

“…Centrifuge Technology: Centrifuges 9,13,46,48,50,[52][53][54][55]64 are considered to be effective for specific applications. Centrifuges can be used to treat low pressure produced water streams as well as treating oily water streams from the drain systems.…”

Section: Chapter II Background and Literature Reviewmentioning

confidence: 99%

“…However, water alone will not provide the 'utopia' for rangeland restoration. Degraded rangelands have undergone change due to environmental or human forces and have generally transitioned over a threshold [48] of ecological health into a state that is usually less productive, both ecologically and in terms of human benefits. To restore such degraded lands requires significant inputs outside of normal ecological succession.…”

Section: Restoring Rangeland Habitatmentioning

confidence: 99%

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Recovery of Fresh Water Resources from Desalination of Brine Produced During Oil and Gas Production Operations

Burnett¹,

Siddiqui²

2006

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A Conceptual Model of Arid Rangeland Degradation

Cited by 295 publications

References 37 publications

Sagebrush steppe recovery after fire varies by development phase of Juniperus occidentalis woodland

Sagebrush steppe recovery after fire varies by development phase of Juniperus occidentalis woodland

From numbers to ecosystems and biodiversity: A mechanistic approach to monitoring

Recovery of Fresh Water Resources from Desalination of Brine Produced During Oil and Gas Production Operations

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