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Mapping the distribution of invasive shrub Austroeupatorium inulifolium (Kunth) R. M. King & H. Rob: a case study from Sri Lanka

Authors:

I. P. K. Piyasinghe ,

University of Peradeniya, Peradeniya, LK
About I. P. K.
Department of Botany, Faculty of Science

Postgraduate Institute of Science, Peradeniya, Peradeniya
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J. Gunatilake,

University of Peradeniya, Peradeniya, LK
About J.
Department of Geology, Faculty of Science
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H. M. S. P. Madawala

University of Peradeniya, Peradeniya, LK
About H. M. S. P.
Department of Botany, Faculty of Science
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Abstract

A light loving invasive shrub, Austroeupatorium inuli­folium has been spreading many land use types in the Knuckles Forest Reserve (KFR) in Sri Lanka, including man-made grass­lands. In developing countries, there are limitations of using novel technologies to quantify and track the distribution of invasive spe­cies due to high costs and lack of facilities. This is a setback for their early detection and to introduce effective control measures. This pilot study attempted to map the distribution of A. inulifolium in man-made grasslands in KFR using high spatial multispectral images. Unsupervised, supervised and knowledge-based classifi­cations were performed to quantify the spatial distribution of A. inulifolium in ERDAS Imagine. The results generated compara­ble results of the extent of area under A. inulifolium by using the unsupervised (108 ha), supervised (94 ha) and knowledge-based classifications (93 ha). They were 18, 15 and 15% from the to­tal area selected for the study (622 - 646 ha), respectively. The results indicated the suitability of high spatial multispectral imag­eries in quantifying the spatial distribution of A. inulifolium. Fur­ther studies are recommended to investigate long-term changes in invasive plant population using multi temporal satellite data.
How to Cite: Piyasinghe, I. P. K., Gunatilake, J., & Madawala, H. M. S. P. (2018). Mapping the distribution of invasive shrub Austroeupatorium inulifolium (Kunth) R. M. King & H. Rob: a case study from Sri Lanka. Ceylon Journal of Science, 47(1), 95–102. DOI: http://doi.org/10.4038/cjs.v47i1.7492
Published on 27 Mar 2018.
Peer Reviewed

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