Demand, propagation and seedling establishment of selected medicinal trees

Netshiluvhi, T.R.

doi:10.1016/s0254-6299(15)31020-6

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…The allometric method for calculating leaf area does not suffer from these sampling and stem area contamination problems, but is critically dependent on the validity of the allometric relationships available, which is hard to assess. The allometric relationships assembled by Netshiluvhi & Scholes (2001) include dozens of species (including the dominants from all the sites), but were determined at locations often very far from the sites at which they were applied. Furthermore, at shrubby sites they were applied to stems with diameters smaller than the stems used to establish the relationship.…”

Section: Resultsmentioning

confidence: 99%

“…Many such relationships have been developed for southern Africa (Rutherford, 1979; Scholes, 1987; Goodman, 1990; Shackleton, 1997), but most are in the ‘grey literature’. These relationships have been compiled and re‐analysed by Netshiluvhi & Scholes (2001). For the species where no allometric information is available (which constitute a small proportion of the leaf biomass on the sites) the following equation, based on the generalized relationship that emerged from the pooled relationships, was used: where L is leaf mass (kg DM) and A is the cross‐sectional area of the stem (m 2 ).…”

Section: Allometrymentioning

confidence: 99%

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Canopy structure in savannas along a moisture gradient on Kalahari sands

Scholes

Fröst

Tian

2003

Global Change Biology

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Measurements of tree canopy architecture were made at six savanna sites on deep, sandy soils, along a gradient of increasing aridity. There was substantial variation in the leaf area estimated within each site, using the same sample frame, but different measurement techniques. The trends in canopy properties in relation to the aridity gradient were consistent, regardless of the technique used for estimating the properties. The effective plant area index for the tree canopy (the sum of the stem area index and the leaf area index (LAI)) declined from around 2 to around 0.8 m 2 m À 2 over a gradient of mean annual rainfall from 1000 to 350 mm. Stems contributed 2-5% of the tree canopy plant area index. Since the tree canopy cover decreased from 50% to 20% over this aridity range, the leaf area index within the area covered by tree canopies remained fairly constant at 3-4 m 2 m À 2. Tree leaves tended from a horizontal orientation to a more random orientation as the aridity increased. On the same gradient, the leaf minor axis dimension decreased from around 30 mm to around 3 mm, and the mean specific leaf area decreased from 14 to 5 m 2 kg ha À 1 . There was good agreement between LAI observed in the field using a line ceptometer and the LAI inferred by the MODIS sensor on the Terra satellite platform, 2 months later in the same season.

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Section: Resultsmentioning

confidence: 99%

Section: Allometrymentioning

confidence: 99%

Canopy structure in savannas along a moisture gradient on Kalahari sands

Scholes

Fröst

Tian

2003

Global Change Biology

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“…As both consumers' and healers' demand preferences are for wild-sourced products, this will challenge efforts for cultivation of traditional medicines to bolster the sometimes questionable ecological sustainability of the industry (Netshiluvhi 1999, Botha et al 2004, Mander et al 2007, Petersen et al 2012). The challenge is that whilst healers may indicate preparedness to alternatively source cultivated materials for traditional medicines (Botha et al 2004), the principal cultural drivers of consumer demand may not necessarily change, so that as long as wild-harvested medicines are perceived by the market to have greater strength and efficacy, and remain available (even at a cost premium), cultivated substitutes may gain limited consumer support.…”

Section: Discussionmentioning

confidence: 99%

Implementing value chain analysis to investigate drivers and sustainability of Cape Town's informal economy of wild-harvested traditional medicine

et al. 2014

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Despite a highly visible presence, policy-maker knowledge of the drivers and participants in the informal economy of wild-harvested medicinal plants in Cape Town remains limited. To illuminate the workings of this local cultural business activity, the researchers adopted value chain analysis (VCA) for dissecting harvesting, trading and consumer demand in the trade. The study included qualitative, openended interviews with 58 traditional healers and a quantitative consumer study of 235 township households. Cape Town's traditional healers are numerous and potentially more uniquely culturally diverse than elsewhere, serving various community health needs. Healer groups enhance their healing reputation by utilising wild-sourced medicines -much of which is harvested locally. Their services remain culturally important and utilised by at least 50% of all consumer respondents. The VCA revealed a universal healer and consumer requirement for wild medicine stocks which has considerable implications for policy-making, protected area management and traditional medicine-oriented conservation projects.

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“…The potting mix comprised four parts loam soil, two parts sand, one part manure and two parts compost (Netshiluvhi, 1999). H. hemerocallidea and T. violacea were subjected to water treatments (10 replicates of clonal plantlets) where seedlings were irrigated with 1000 ml of distilled water per plant in intervals of 3, 14 and 21 days.…”

Section: Planting Materials Preparationmentioning

confidence: 99%

Effect of water stress on antimicrobial activity of selected medicinal plant species

Netshiluvhi

Eloff

2016

South African Journal of Botany

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a b s t r a c t Available online xxxx Edited by J.J.M. MeyerSome traditional medicinal practitioners believe that cultivated medicinal plants will lose healing powers, compared to plants growing in nature. Several scientists have shown that a plant under stress will produce secondary metabolites that may influence its medicinal properties. This perception has negative effects on the cultivation of medicinal plants to control local extinctions by uncontrolled collection of medicinal plants. To investigate this perception we examined the effect of water treatments on the antimicrobial activity of selected plant species grown under controlled conditions. Firstly, Tulbaghia violacea and Hypoxis hemerocallidea plants were subjected to watering regimes of 1000 ml of water in intervals of 3,14 and 21 days in a preliminary experiment. Subsequently, T. violacea, Leonotis dysophylla and Bulbine frutescens were subjected to different water regimes of 50, 100, 200 and 500 ml every second day for 240 days. Air-dried leaves of matured plants were finely ground and extracted with acetone. Minimum inhibitory concentration (MIC) and total activity were determined in order to evaluate the antimicrobial activity and potential use of plant extracts against four bacteria and two fungi. In general there were no statistically significant differences in MIC and total activity values and there were no clear trends across treatments. The applied water treatments did not cause significant effects on the antimicrobial activity of extracts. The fact that water stress did not materially influence antimicrobial activity does not mean that water stress does not affect other medicinal properties. Nevertheless our results question the general perception of traditional medicinal practitioners that plants growing under natural stress conditions have higher biological activities at least as far as water stress related to antimicrobial activities is concerned.

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Demand, propagation and seedling establishment of selected medicinal trees

Cited by 10 publications

References 12 publications

Canopy structure in savannas along a moisture gradient on Kalahari sands

Canopy structure in savannas along a moisture gradient on Kalahari sands

Implementing value chain analysis to investigate drivers and sustainability of Cape Town's informal economy of wild-harvested traditional medicine

Effect of water stress on antimicrobial activity of selected medicinal plant species

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