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Ruan Veldtman   Dr.  Senior Scientist or Principal Investigator 
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Ruan Veldtman published an article in January 2019.
Top co-authors
Thomas Seifert

52 shared publications

Scientes Mondium UG (haftungsbeschränkt), Ruppertskirchen, Germany

Sylvanus Mensah

20 shared publications

Laboratory of Biomathematics and Forest Estimation, University of Abomey-Calavi, Benin

Ben Du Toit

12 shared publications

Department of Forest and Wood Science, Stellenbosch University, Matieland, South Africa

5
Publications
8
Reads
0
Downloads
11
Citations
Publication Record
Distribution of Articles published per year 
(2016 - 2019)
Total number of journals
published in
 
5
 
Publications
Article 1 Read 1 Citation Water as a resource, stress and disturbance shaping tundra vegetation Julia Kemppinen, Pekka Niittynen, Juha Aalto, Peter C. Le Ro... Published: 24 January 2019
Oikos, doi: 10.1111/oik.05764
DOI See at publisher website
Article 0 Reads 0 Citations The Invasive Vespidae in South Africa: Potential Management Strategies and Current Status C. Van Zyl, P. Addison, R. Veldtman Published: 01 September 2018
African Entomology, doi: 10.4001/003.026.0267
DOI See at publisher website
Article 0 Reads 0 Citations Fine- and broad-scale distribution of a cushion plant species: Patterns and predictors for Euphorbia clavarioides Mia Momberg, Michelle Greve, Stephni Van Der Merwe, Peter C.... Published: 01 January 2018
Arctic, Antarctic, and Alpine Research, doi: 10.1080/15230430.2018.1505136
DOI See at publisher website ABS Show/hide abstract
Cushion plants are a key Arctic, Antarctic, and alpine growth form, with many cushion-forming species strongly affecting community structure in abiotically stressful environments. Despite their ecological importance, there is little information about what drives the distribution of species exhibiting this growth form. This study investigates the determinants of the distribution of a cushion plant species, Euphorbia clavarioides at (1) a fine scale, using field-collected predictors from an alpine landscape; and (2) a broad scale, using distribution records and climate data across the species’ distributional range. At the fine scale, the species was locally rare (occurring in about 4 percent of samples) and may be limited to specific microsites by interspecific competition with taller-growing species. Broad-scale species distribution modeling showed that both temperature and rainfall are important in predicting the distribution of E. clavarioides with a higher probability of occurrence in areas with higher annual precipitation and mean annual temperatures < 15°C. Given the species’ sensitivity to competition and abiotic conditions (high temperatures and low precipitation), E. clavarioides may be vulnerable to environmental changes. Therefore, assuming that other cushion plant species exhibit similar patterns, species of this growth form may be particularly useful indicators of change in alpine, Arctic, and Antarctic areas.
Article 0 Reads 3 Citations Impact of biotic interactions on biodiversity varies across a landscape Heidi K. Mod, Risto K. Heikkinen, Peter C. Le Roux, Mary S. ... Published: 15 June 2016
Journal of Biogeography, doi: 10.1111/jbi.12794
DOI See at publisher website
Article 7 Reads 7 Citations Aboveground Biomass and Carbon in a South African Mistbelt Forest and the Relationships with Tree Species Diversity and ... Sylvanus Mensah, Ruan Veldtman, Ben Du Toit, Romain Glèlè Ka... Published: 08 April 2016
Forests, doi: 10.3390/f7040079
DOI See at publisher website ABS Show/hide abstract
Biomass and carbon stocks are key information criteria to understand the role of forests in regulating global climate. However, for a bio-rich continent like Africa, ground-based measurements for accurate estimation of carbon are scarce, and the variables affecting the forest carbon are not well understood. Here, we present the first biomass study conducted in South Africa Mistbelt forests. Using data from a non-destructive sampling of 59 trees of four species, we (1) evaluated the accuracy of multispecies aboveground biomass (AGB) models, using predictors such as diameter at breast height (DBH), total height (H) and wood density; (2) estimated the amount of biomass and carbon stored in the aboveground compartment of Mistbelt forests and (3) explored the variation of aboveground carbon (AGC) in relation to tree species diversity and structural variables. We found significant effects of species on wood density and AGB. Among the candidate models, the model that incorporated DBH and H as a compound variable (DBH2 × H) was the best fitting. AGB and AGC values were highly variable across all plots, with average values of 358.1 Mg·ha−1 and 179.0 Mg·C·ha−1, respectively. Few species contributed 80% of AGC stock, probably as a result of selection effect. Stand basal area, basal area of the ten most important species and basal area of the largest trees were the most influencing variables. Tree species richness was also positively correlated with AGC, but the basal area of smaller trees was not. These results enable insights into the role of biodiversity in maintaining carbon storage and the possibilities for sustainable strategies for timber harvesting without risk of significant biomass decline.
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