Rehabilitation of Rangelands in Paulshoek, Namaqualand: Understanding vegetation change using biophysical manipulations

Simons, Lee H.; Allsopp, Nicky

doi:10.1016/j.jaridenv.2006.11.012

Cited by 34 publications

(39 citation statements)

References 19 publications

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“…Both the time needed and the lack of a promising natural restoration potential at DEG to support species which are common to sustainably managed rangelands, point towards the need for active interventions. The maintenance of landscape functionality in terms of trapping and storing seeds (Dreber and Esler, 2011) suggests that interventions improving capture of seeds and natural recruitment like brushpacking (Simons and Allsopp, 2007) are unnecessary at the degraded site. Due to the negligible seed rain effects, for restoration the artificial creation of a seed bed of target species is most important.…”

Section: Evaluation Of the Restoration Potentialmentioning

confidence: 99%

“…Seed rich topsoil replacement and sowing of target species (De Villiers et al, 2003;Solomon et al, 2006;Visser et al, 2004) implemented in a long-term strategic framework of sustainable land management (Jones and Esler, 2004) would be necessary in order to improve rangeland condition in terms of vegetation composition, functionality, and productivity. However, the success strongly relies on species-specific recruitment and establishment requirements, which have to be understood in advance (Simons and Allsopp, 2007).…”

Section: Evaluation Of the Restoration Potentialmentioning

confidence: 99%

“…Beukes et al, 2002;Snyman, 1998;Todd and Hoffman, 2009) and the assessment of land degradation and restoration attempts (e.g. Dean et al, 1995b;Simons and Allsopp, 2007;Visser et al, 2004). However, the literature is dominated by studies focusing on aboveground assessments, often neglecting the role that soil seed banks play in ecosystem resistance and resilience.…”

Section: Introductionmentioning

confidence: 99%

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Species, functional groups and community structure in seed banks of the arid Nama Karoo: Grazing impacts and implications for rangeland restoration

Dreber

Oldeland

Rooyen

2011

Agriculture, Ecosystems & Environment

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Please cite this article in press as: Dreber, N., et al., Species, functional groups and community structure in seed banks of the arid Nama Karoo: Grazing impacts and implications for rangeland restoration. Agric. Ecosyst. Environ. (2011) The regeneration potential of grazing-affected Nama Karoo vegetation was evaluated by comparing soil seed banks of different microsites across a fence-line contrast in arid Namibia. Seed banks under low and high grazing pressure reflected the condition of the standing vegetation in terms of composition, community structure and species abundance distributions. However, a close concordance between vegetation and seed bank was restricted to the herbaceous and grassy vegetation within the inter-shrub matrix. The divergence of seed bank communities across the fence-line was low at community level but high at the level of species abundances. Continuous severe grazing increased the abundance of small-seeded, prostrate forbs with round seeds and favored unpalatable, annual grasses over palatable, perennial grasses. Microsites provided a source of small-scale variation in seed bank community composition and were dissimilar between the rangelands.Results indicated an advanced divergence in the vegetation at the degraded site with seed banks of species common under sustainable grazing being drastically reduced. Their low abundance, even in safe sites, suggests that long-distance dispersal is one of the main limiting factors for natural re-establishment after disturbance. The inertia in recovery of Namibian degraded rangelands through seed limitation can be overcome only by active species introduction.

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Section: Evaluation Of the Restoration Potentialmentioning

confidence: 99%

Section: Evaluation Of the Restoration Potentialmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Species, functional groups and community structure in seed banks of the arid Nama Karoo: Grazing impacts and implications for rangeland restoration

Dreber

Oldeland

Rooyen

2011

Agriculture, Ecosystems & Environment

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“…Continuous grazing in degraded arid grassland had a negative effect on plant diversity and biomass production, thus potentially limiting the resilience of the grassland response to interference and environmental stress (Simons and Allsopp 2007). In our study, plant covers and heights significantly decreased with the increasing grazing intensities (P < 0.05, Table 1); probably due to the grazing livestock's biting effect (Medina-Roldán et al 2012).…”

Section: Resultsmentioning

confidence: 54%

Mehlich 3 extractant used for the evaluation of wheat-available phosphorus and zinc in calcareous soils

Sedlář¹,

Balík²,

Kulhánek³

et al. 2018

PLANT SOIL ENVIRON

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Relation between wheat (Triticum aestivum) nutritional status determined at the beginning of stem elongation and during anthesis, respectively, and available content of phosphorus (P-M3) and zinc (Zn-M3) determined by the Mehlich 3 extractant was studied. Both one-year pot experiment with spring wheat and two-year on-farm trials with winter wheat were run on various calcareous soils (pH values of 7.18–7.94, median 7.80, P-M3 1–289 ppm, median 54, and Zn-M3 2–14 ppm, median 4), in the Czech Republic (Central Europe). Phosphorus nutrition index (ratio of phosphorus concentration in shoot biomass to critical phosphorus concentration – P<sub>c</sub>) was calculated using the Belanger et al.’s model: P<sub>c</sub> = –0.677 + 0.221N – 0.00292N(2), where both phosphorus and nitrogen concentrations were expressed in g/kg shoot dry matter. Unlike phosphorus concentration in shoot biomass, phosphorus nutrition index significantly correlated with P-M3 content in soil. Optimal values of the phosphorus nutrition index were recorded if P-M3 was 51–68 ppm. Zinc concentration in shoot biomass more strongly correlated with P:Zn ratio (M3) in soil compared to Zn-M3 content in soil. P:Zn ratio in shoot biomass of 130:1 did not lead to phosphorus deficiency and corresponded to P:Zn (M3) ratio in soil of 9.3:1–14.3:1.

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“…Climate is relatively mild , with temperatures ranging from below zero during winter months to above 37 C during summer (MACKELLAR et al 2007;SIMONS & ALLSOPP 2007) with an annual average of 16-18 °C (COWLING et al 1997).…”

mentioning

confidence: 99%

Interactions between wildlife and vegetation under different grazing intensities and habitat types in the Knersvlakte, South Africa

Bösing¹

2009

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Rehabilitation of Rangelands in Paulshoek, Namaqualand: Understanding vegetation change using biophysical manipulations

Cited by 34 publications

References 19 publications

Species, functional groups and community structure in seed banks of the arid Nama Karoo: Grazing impacts and implications for rangeland restoration

Species, functional groups and community structure in seed banks of the arid Nama Karoo: Grazing impacts and implications for rangeland restoration

Mehlich 3 extractant used for the evaluation of wheat-available phosphorus and zinc in calcareous soils

Interactions between wildlife and vegetation under different grazing intensities and habitat types in the Knersvlakte, South Africa

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