Preliminary study on invasive plants in cone karst depressions in Guizhou:a case study on Pingtang County
In order to explore the background of invasive plants in the forests,grasslands and wetlands in Pingtang County,we investigated the status of invasive plants in the forests,grasslands and wetlands in Pingtang County by u-sing the methods of field survey,interview and sample plot survey.The results were as follows:(1)There were 94 species of invasive plants in Pingtang County,belonging to 65 genera and 32 families.Among them,Asteraceae had the largest number of species(24),accounting for 25.53％of the total number of species,followed by Leguminosae(12),accounting for 12.77％of the total number of species.There were 7 species of Solanaceae and Amaranthace-ae,respectively,each accounting for 7.45％of the total number of species.(2)There were 40 species of annual herbs,accounting for 42.55％of the total number of invasive plants;37 species of perennial herbs,accounting for 39.36％;2 species of lianas,accounting for 2.13％;and 15 species of woody plants,accounting for 15.96％.(3)66 species originated from America,accounting for 70.21％of the total number of invasive plants;12 species origi-nated from Europe,accounting for 12.77％;9 species originated from Africa,accounting for 9.57％;4 species origi-nated from Asia,accounting for 4.26％;3 species originated from Australia,accounting for 3.19％.
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