Universität zu Köln

Brueser, Katharina, Feilhauer, Hannes ORCID: 0000-0001-5758-6303, Linstaedter, Anja, Schellberg, Juergen, Oomen, Roelof J., Ruppert, Jan C. ORCID: 0000-0001-7191-1918 and Ewert, Frank (2014). Discrimination and characterization of management systems in semi-arid rangelands of South Africa using RapidEye time series. Int. J. Remote Sens., 35 (5). S. 1653 - 1674. ABINGDON: TAYLOR & FRANCIS LTD. ISSN 1366-5901

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Abstract

In South African grasslands, rangeland management is strongly related to land tenure. Communal farms are reported to exhibit less desirable vegetation conditions for livestock than commercial farms. Time series of high spatial and temporal resolution imagery may be useful for improved evaluation of these rangelands as they provide information at a spatial scale similar to the typical scale of field assessments and may thus overcome the limited spatio-temporal representativeness of field measurements. A time series of 13 RapidEye images over one growing season (2010-2011) was used to explore spectral differences between and within two management systems (commercial vs. communal). Isomap ordination was applied to map continuous spectral dissimilarities of sample plots. Using regression with simultaneous autoregressive models (SAR), dissimilarities were subsequently related to ecological variables of plant and soil, including indicators for grazing effects. The largest differences were found between sample plots of communal and commercial farms. Vegetation attributes were significantly related to dissimilarities in reflectance, both from the growing season and the dormant period. However, these relationships did not suggest vegetation degradation on communal farms. They further suggest that a management-related pattern of grazing disturbance in the summer months led to spectral differences between farms but could have impaired the detailed characterization of spectral dissimilarities related to differences in vegetation composition.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Brueser, Katharina UNSPECIFIED UNSPECIFIED UNSPECIFIED Feilhauer, Hannes UNSPECIFIED orcid.org/0000-0001-5758-6303 UNSPECIFIED Linstaedter, Anja UNSPECIFIED UNSPECIFIED UNSPECIFIED Schellberg, Juergen UNSPECIFIED UNSPECIFIED UNSPECIFIED Oomen, Roelof J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ruppert, Jan C. UNSPECIFIED orcid.org/0000-0001-7191-1918 UNSPECIFIED Ewert, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-443547
DOI:	10.1080/01431161.2014.882028
Journal or Publication Title:	Int. J. Remote Sens.
Volume:	35
Number:	5
Page Range:	S. 1653 - 1674
Date:	2014
Publisher:	TAYLOR & FRANCIS LTD
Place of Publication:	ABINGDON
ISSN:	1366-5901
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INDUCED LAND DEGRADATION; THEMEDA-TRIANDRA; GRASSLAND BIOME; VEGETATION; GRADIENTS; CLIMATE; PRECIPITATION; SOILS; WATER; VISUALIZATION Multiple languages Remote Sensing; Imaging Science & Photographic Technology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44354