| Автор | Martens, J.C. |
| Автор | Morris, C.D. |
| Дата выпуска | 1994 |
| dc.description | AbstractHierarchical classification based on proportional species composition of the grass layer was used to identify and classify semi‐arid rangeland into range types. The relation between range types produced by the classification and the environmental parameters measured were investigated using a two‐group, and a multi‐group stepwise linear discriminant function analysis. The first split of the TWINSPAN dendrogram separated savanna from open grassveld. The open grassveld was characterized by Themeda triandra, Microchloa caffra, Eragrostis capensis and E. plana and the savanna by Setaria neglecta, Sporobolus fimbri atus,Panicum stapfianum and Cymbopogon plurinodis. The two range types were best discriminated by rainfall, soil depth and altitude with sites in the grassveld corresponding to deep soils and receiving rainfall of more than 450 mm a<sup>‐1</sup>, and sites in savanna corresponding to shallow soils and receiving rainfall of 400–500 mm a<sup>‐1</sup>. Further divisions within these two range types were related to soil textural and chemical characteristics of the A‐horizon. Multi‐group discriminant function analysis identified eight environmental variables which best discriminate between range types at level 3 of the hierarchical dendrogram. Rainfall, soil depth and altitude were selected as the most important environmental variables discriminating between range types. Reclassification by discriminant analysis using the eight selected environmental factors resulted in a 67% concurrence with range types. It is proposed that the area be stratified on the basis of the current classification for monitoring and management purposes. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Тема | Classification |
| Тема | discriminant analysis |
| Тема | environmental variables |
| Тема | range type |
| Тема | species composition |
| Название | Classification of the grass layer of semi‐arid rangeland in the Smaldeel area of the eastern Cape |
| Тип | research-article |
| DOI | 10.1080/10220119.1994.9638360 |
| Electronic ISSN | 1727-9380 |
| Print ISSN | 1022-0119 |
| Журнал | African Journal of Range & Forage Science |
| Том | 11 |
| Первая страница | 61 |
| Последняя страница | 68 |
| Аффилиация | Martens, J.C.; Döhne Agricultural Development Institute, Dept of Agriculture |
| Аффилиация | Morris, C.D.; Roodeplaat Grassland Institute, Agricultural Research Council |
| Выпуск | 3 |
| Библиографическая ссылка | Acocks, JPH. 1988. Veld types of South Africa (), 3rd edn, Memoirs of the Botanical Survey of South Africa Number 57 |
| Библиографическая ссылка | Anon. 1985. The grazing capacity map for the Eastern Cape Region, Stutterheim: Department of Agriculture & Water Supply. |
| Библиографическая ссылка | Austin, MP, Williams, OB and Belbin, L. 1981. Grassland dynamics under sheep grazing in an Australian Mediterranean type climate. Vegetatio, 47: 201–211. |
| Библиографическая ссылка | Bosch, OJH, Janse van Rensburg, FB and Truter, S du T. 1987. Identification and selection of benchmark sites on litholitic soils of the western grassland biome of South Africa. Journal of the Grassland Society of Southern Africa, 4: 59–62. |
| Библиографическая ссылка | Danckwerts, JE and Marais, JB. 1989. An evaluation of the economic viability of commercial pastoralism in the Smaldeel area of the eastern Cape. Journal of the Grassland Society of Southern Africa, 6: 1–7. |
| Библиографическая ссылка | Foran, BD, Bastin, G and Shaw, KA. 1986. Range assessment and monitoring in arid lands: the use of classification and ordination in range survey. Journal of Environmental Management, 22: 67–84. |
| Библиографическая ссылка | Gibbs Russell, GE, Watson, L, Koekemoer, M, Smook, L, Barker, NP, Anderson, HM and Dallwitz, MJ. 1990. Grasses of southern Africa, Memoirs of the Botanical Survey of South Africa 58 |
| Библиографическая ссылка | Hardy, MB and Hurt, CR. 1989. An evaluation of veld condition assessment techniques in Highland Sourveld. Journal of the Grassland Society of Southern Africa, 6: 51–58. |
| Библиографическая ссылка | Hill, MO. 1979. TWINSPAN ‐ a FORTRAN program for arranging multivariate data in an ordered two‐way table by classification of the individuals and attributes, Ithaca, New York: Cornell University. |
| Библиографическая ссылка | Hurt, CR and Hardy, MB. 1989. A weighted key species method for monitoring changes in species composition of Highland Sourveld. Journal of the Grassland Society of Southern Africa, 6: 109–113. |
| Библиографическая ссылка | Marais, JN. 1979. “The climate of Ciskei”. In The agricultural potential of the Ciskei, Edited by: Laker, MC. Alice: University of Fort Hare. |
| Библиографическая ссылка | Martens, JC, Danckwerts, JE, Stuart‐Hill, GC and Aucamp, AJ. 1990. Use of multivariate techniques to identify vegetation units and monitor change on a livestock production system in a semi‐arid savanna of the eastern Cape. Journal of the Grassland Society of Southern Africa, 7: 184–189. |
| Библиографическая ссылка | Mentis, MT. 1983. Towards objective veld condition assessment. Proceedings of the Grassland Society of Southern Africa, 18: 77–80. |
| Библиографическая ссылка | Morris, CD, Tainton, NM and Hardy, MB. 1992. Plant species dynamics in the Southern Tall Grassveld under grazing, resting and fire. Journal of the Grassland Society of Southern Africa, 9: 90–95. |
| Библиографическая ссылка | Mosley, JC, Bunting, SC and Hironaka, M. 1986. Determining range condition from frequency data in mountain meadows of central Idaho. Journal of Range Management, 39: 561–565. |
| Библиографическая ссылка | Nie, NH, Hull, CH, Jenkins, JG, Steinbrenner, K and Brent, DH. 1975. Statistical package for the social sciences (), 2nd edn, New York: McGraw‐Hill. |
| Библиографическая ссылка | Palmer, AR. 1991. A syntaxonomic and synecological account of the vegetation of the eastern Cape midlands. South African Journal of Botany, 57: 76–94. |
| Библиографическая ссылка | Teague, WR, Trollope, WSW and Aucamp, AJ. 1981. Veld management in the semi‐arid bush‐grass communities of the eastern Cape. Proceedings of the Grassland Society of Southern Africa, 16: 23–28. |
| Библиографическая ссылка | Van Tongeren, OFR. 1987. “Cluster analysis”. In Data analysis in community and landscape ecology, Edited by: Jongman, RH, Ter Braak, CJF and Van Tongeren, OFR. 174–206. Wageningen: Pudoc. |
| Библиографическая ссылка | Walker, RS. 1987. Monitoring species composition in mountain catchment grasslands, Pietermartizburg: University of Natal. MSc(Agric) thesis, |
| Библиографическая ссылка | Whittaker, RH. 1978. “Direct gradient analysis”. In Ordination of plant communities, Edited by: Whittaker, RH. The Hague: Dr W Junk Publishers. |
| Библиографическая ссылка | Wikum, DA and Wali, MJ. 1974. Analysis of a North Dakota gallery forest: vegetation in relation to topographic and soil gradients. Ecological Monographs, 44: 441–464. |
| Библиографическая ссылка | Wilson, AD. 1984. Points of reference in the assessment of change in vegetation and land condition. Australian Rangeland Journal, 6: 69–74. |
| Библиографическая ссылка | Wilson, AD. Rangelands: a resource under siege. Proceedings of the 2nd International Rangeland Congress. Canberra. The monitoring of changes in range condition: a multivariate site potential approach, Edited by: Joss, PJ, Lynch, PW and Williams, OB. Australian Acadamy of Science. |
