Standing crops of dominant &lt;i&gt;combretum&lt;/i&gt; species at three browsing levels in the Kruger National Park

Dayton, Bruce R.

doi:10.4102/koedoe.v21i1.961

Cited by 20 publications

(7 citation statements)

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“…The median values of standing crop for the different land-use types are nature conservation 20,4 t/ha, commercial cattle farming 17,5 t/ha, communal lands 4,8 t/ha. Griffin et al (1992), 2 Shackleton (unpublished data), 3 Dayton (1978). 4 Rutherford (1979).…”

Section: Fuelwood Demandmentioning

confidence: 94%

Growing more trees for fuelwood in the Northern Transvaal or redistribution after sustainable harvesting?

Shackleton

1994

Development Southern Africa

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A model of the supply and demand for fuelwood within Region G is considered against the background of the plant nursery programme of the Biomass Initiative. Despite severe deficit in fuelwood supply in the homeland areas, the region as a whole could be self-sufficient in sustainably harvested fuelwood from natural vegetation given redistribution of fuelwood from areas in the region where sustainable supply is in excess of demand (mainly conservation areas and commercial grazing areas and to a lesser extent commercial forestry plantations); an appropriate transport and distribution system; and multi-purpose land-use management. Redistribution would provide jobs within the neglected rural sector and the stimulus for additional industries around other natural resources. It would obviate the need for nurseries aimed primarily at encouraging rural communities to plant trees to alleviate the fuelwood shortage.

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Section: Fuelwood Demandmentioning

confidence: 94%

Growing more trees for fuelwood in the Northern Transvaal or redistribution after sustainable harvesting?

Shackleton

1994

Development Southern Africa

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“…All woody plants (>0.5 m in height) rooted within the transect were identified to species and categorized as either trees (>=3 m in height, shrubs (<3 m), coppice (trees resprouting from the base after elephants have pushed them over), or dead. Trees with no available browse (no foliage below 5.5 m, the maximum browsing height of giraffe [Dayton 1978]) were also recorded. Trees and shrubs were respectively each assigned to one of four easily distinguishable size classes.…”

Section: Vegetation Samplingmentioning

confidence: 99%

Topo-edaphic, floristic and physiognomic gradients of woody plants in a semi-arid African savanna woodland

Witkowski

O’Connor

1996

Vegetatio

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The variation in topo-edaphic conditions, woodland composition and physiognomic structure of a semi-arid savanna woodland, namely the 59 400 ha Klaserie Nature Reserve, was studied with multivariate techniques. Spatial variation in the texture and chemistry of both the A-and B-horizons was substantial. One gradient of the A-horizon was of increasing clay, silt, organic matter, pH and conductivity, while a second gradient was of increasing rockiness, slope and gravel content, associated in part with upper landscape positions. Physiognomic structure of the woodland also displayed substantial spatial variation. Variation in tree density had the greatest effect on total canopy volume, and the density of coppice and dead individuals were closely correlated. Topo-edaphic variation, after the effect of vegetation composition had been accounted for, had a direct effect on woodland structure, as clay content of soils or rockiness influenced shrub density, and catenal position together with silt-or gravel-content of soils influenced coppice density. Ordination analyses identified that the included topo-edaphic variables accounted for a significant amount of floristic variation, but also showed that important environmental variables were omitted. Floristic variation of woody elements was of the nature of a large number of relatively equivalent, independent gradients rather than of a few simple primary gradients. Ten woodland types were identified by TWlNSPAN which differed in their topo-edaphic and physiognomic character. Distinctive woodland assemblages were found on rocky outcrops or alluvial areas, on deep, sandy soils or on clay-or silt-rich soils, Colophospermum mopane formed the densest woodlands. Characteristics of the B-horizon were often dissimilar to those of the A-horizon, and seemed important for woodland composition.

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“…The average was recorded CD and formed the basis for canopy area (CA) calculations (CA = p/4 CD 2 ). The BD was measured just above the basal swell at roughly ankle height, because most woody vegetation grows in multistemmed forms at all sites (Dayton, 1978). For multistemmed individuals, the total basal area (BA) was calculated as the sum of the basal areas of all stems:…”

Section: Sampling Protocolmentioning

confidence: 99%

An analysis of structure: biomass structure relationships for characteristic species of the western Kalahari, Botswana

et al. 2013

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Savannah ecosystems are important carbon stocks on the Earth, and their quantification is crucial for understanding the global impact of climate and land‐use changes in savannahs. The estimation of aboveground/belowground plant biomass requires tested allometric relationships that can be used to determine total plant biomass as a function of easy‐to‐measure morphological indicators. Despite recent advances in savannah ecology, research on allometric relations in savannahs remains confined to a few site‐specific studies where basal area is typically used as the main morphometric parameter with plant biomass. We investigate allometric relations at four sites along a 950‐km transect in the Kalahari across mean rainfall gradient 170 mm yr−1–550 mm yr−1. Using data from 342 harvested trees/shrubs, we relate basal area, height and crown diameter to aboveground biomass. These relationships are strongest in trees and weakest in small shrubs. Strong allometric relationships are also determined for morphologically similar groups of woody vegetation. We show that crown diameter can be used as an alternative to basal area in allometric relationships with plant biomass. This finding may enhance the ability to determine aboveground biomass over large areas using high‐resolution aerial or satellite imagery without requiring ground‐based measurements of basal area.

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Standing crops of dominant <i>combretum</i> species at three browsing levels in the Kruger National Park

Cited by 20 publications

References 0 publications

Growing more trees for fuelwood in the Northern Transvaal or redistribution after sustainable harvesting?

Growing more trees for fuelwood in the Northern Transvaal or redistribution after sustainable harvesting?

Topo-edaphic, floristic and physiognomic gradients of woody plants in a semi-arid African savanna woodland

An analysis of structure: biomass structure relationships for characteristic species of the western Kalahari, Botswana

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