| Автор | Stalmans, M. |
| Автор | Mentis, M.T. |
| Дата выпуска | 1993 |
| dc.description | AbstractA step‐wise approach was followed towards the design of a monitoring system for the herbaceous layer on the escarpment of the Drakensberg mountains in the Transvaal, South Africa. The parameter of concern was proportional species composition. In a first phase, the plot size and number of point observations required to achieve a repeatable assessment of a single plot at a predetermined precision level were investigated. The Chapman‐Richards three‐parameter model was fitted to similarity values obtained from comparisons between successively larger sets of points. This resulted in 140 points being required within a 30 × 30 m plot in order to recover 95% of the internal association of the composition data. In a second phase, the number of plots required for a repeatable assessment of a large stratum was determined. Successively larger nested areas were sampled. Monitoring of a large stratum at 95% of asymptotic replicate similarity would require sets of 21 randomly selected plots. The third and final phase was concerned with the development of a procedure for detecting change. A similarity test made it possible to detect change between successive surveys with a known degree of precision. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Тема | Replicate similarity |
| Тема | sourveld |
| Тема | wheel‐point apparatus |
| Название | Development of monitoring procedures for the herbaceous layer on the Northeastern Transvaal escarpment |
| Тип | research-article |
| DOI | 10.1080/10220119.1993.9638339 |
| Electronic ISSN | 1727-9380 |
| Print ISSN | 1022-0119 |
| Журнал | African Journal of Range & Forage Science |
| Том | 10 |
| Первая страница | 129 |
| Последняя страница | 134 |
| Аффилиация | Stalmans, M.; Resource Ecology Group, Department of Botany, University of the Witwatersrand; KaNgwane Parks Corporation |
| Аффилиация | Mentis, M.T.; Resource Ecology Group, Department of Botany, University of the Witwatersrand; Envirobiz Africa |
| Выпуск | 3 |
| Библиографическая ссылка | Acocks, JPH. 1975. Veld types of South Africa (), 2nd edn, Memoirs of the Botanical Survey of South Africa 40 |
| Библиографическая ссылка | Barnett, V. 1981. Elements of sampling theory, London: Hodder & Stoughton. |
| Библиографическая ссылка | Brockett, B and Holton, GD. 1986. “Proposed procedures for monitoring vegetation”. In Monitoring in South African grasslands, Occasional Report 13 Edited by: Mentis, MT. Pretoria: CSIR. |
| Библиографическая ссылка | Button, A. 1973. A regional study of the stratigraphy and development of the Transvaal basin in the eastern and north‐eastern Transvaal, Johannesburg: University of the Witwatersrand. PhD thesis, |
| Библиографическая ссылка | Duckworth, AC and Walker, RS. 1988. REPSIM ‐ SAS macros for determining efficient sampling intensities by replicate similarity, Occasional Report 30 Pretoria: CSIR. |
| Библиографическая ссылка | Gamble, F. 1988. “Climate of the Transvaal Escarpment”. In Environmental conservation features of the Transvaal Escarpment, Occasional Report 31 Edited by: Ferrar, AA, Isaacs, G and Stacey, JR. Pretoria: CSIR. |
| Библиографическая ссылка | Gauch, HG. 1982. Multivariate analysis in community ecology, Cambridge: Cambridge University Press. |
| Библиографическая ссылка | Hall, CAS and Day, JW. 1977. Ecosystem modelling in theory and practice, New York: John Wiley & Sons. |
| Библиографическая ссылка | Hardy, MB and Walker, RS. 1991. Determining sample size for assessing species composition in grassland. Journal of the Grassland Society of Southern Africa, 8: 70–73. |
| Библиографическая ссылка | Hill, MO. 1979. DECORANA ‐ A FORTRAN program for detrended correspondence analysis and reciprocal averaging, Ithaca, New York: Cornell University. |
| Библиографическая ссылка | Hinds, WT. 1984. Towards monitoring of long‐term trends in terrestrial ecosystems. Environmental Conservation, 11: 11–18. |
| Библиографическая ссылка | Jongman, RHG, ter Braak, CJF and van Tongeren, OFR. 1987. Data analysis in community and landscape ecology, Wageningen: Pudoc. |
| Библиографическая ссылка | Mentis, MT. 1984. Monitoring in South African grasslands, South African National Scientific Programmes Report 91 Pretoria: CSIR. |
| Библиографическая ссылка | Mentis, MT. 1986. “Veld monitoring using permanent plots — a case history”. In Monitoring in South African grasslands, Occasional Report 13 Edited by: Mentis, MT. Pretoria: CSIR. |
| Библиографическая ссылка | Mentis, MT. 1989. Developing techniques to detect vegetation changes in South Africa. South African Journal of Science, 85: 86–88. |
| Библиографическая ссылка | Mentis, MT and Walker, RS. 1989. An expert system for monitoring vegetation. South African Journal of Science, 85: 241–245. |
| Библиографическая ссылка | Tidmarsh, CEM and Havenga, CM. 1955. The wheel‐point method of survey and measurement of semi‐open grasslands and Karoo vegetation in South Africa, Memoirs of the Botanical Survey of South Africa 29 |
| Библиографическая ссылка | Von Gadow, K and van Hensbergen, HJ. 1987. Contributions to forestry modelling research. South African Forestry Journal, 140: 44–50. |
| Библиографическая ссылка | Walker, RS. 1988. “Monitoring species composition in mountain catchment grasslands”. In Vegetation Monitoring Workshop III, Occasional Report 39 Edited by: Mentis, MT. Pretoria: CSIR. |
| Библиографическая ссылка | Whittaker, RH. 1967. Gradient analysis of vegetation. Biology Review, 42: 207–264. |
| Библиографическая ссылка | Zar, JH. 1974. Biostatistical analysis, London: Prentice‐Hall. |
