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Distribution pattern and ecological determinants of an invasive plant Parthenium hysterophorus L., in Malakand division of Pakistan

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Journal of Mountain Science 2020年第7期17卷 1670-1683页

作者： Nasrullah KHAN Khudija BIBI Rafi ULLAH Department of Botany University of MalakandChakdara 18800 District Dir LowerKhyber PakhtunkhwaPakistan Swiss Federal Institute for Forest Snow and Landscape ResearchZuercherstrasse 1118903BirmensdorfSwitzerland

After habitat loss,drastic effects of biological invasion caused by alien invasive species to the native biodiversity have been acknowledged worldwide by the agriculturists,ecologists,and governments as it is more overwhelming than pollution,harvest and disease *** such example of biological invasion is *** which is considered to be one of the topmost noxious weeds threatening ecosystems diversity in the world,particularly in Pakistan due to its invasive success and generalist *** no studies have explored the pattern and determinants of plant biodiversity in the Parthenium dominated *** we explored the current distribution pattern of this species with relation to environmental variables in the Malakand division of northern ***-three sites dominated by *** were identified through a participatory mapping process combined with traditional ecological knowledge and quantitative inventories were *** total,we found 62 plant species in 55 genera and 32 families,predominately from Asteraceae,Poaceae,and ***’s agglomerative clustering procedure showed three well-differentiated,and ecologically meaningful but overlapping vegetation *** was found to be the leading species with an average Importance value ranging from 33.28%to 65.59%.Based on our criteria,surprisingly we found significantly less to be fully(30%)or partially invaded(21%)than the less invaded(47%)plots,indicating the gradual invasive success of the species across the *** Correspondence Analysis(CCA-ordination)has explained 36.9%of the cumulative variance by the first three axes and identified elevation(r=-0.526),slope(r=0.438)and percent sand(r=-0.474)to be the major environmental factors affecting the distribution of *** and associated *** results suggested that elevation and percent sand negatively affect Parthenium distribution whereas slope has a positive relationship

关键词： habitat lost Biological invasion Parthenium hysterophorus Multivariate analysis Conservation and Management

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