Effect on species diversity of plant communities caused by invasion of Alternanthera philoxeroides in different habitats

Abstract

Abstract: Alternanthera philoxeroides is one of the most notorious invasive weeds and has been introduced to regions with warm to subtropical humid climates worldwide. To ascertain the effect of the invasive species on plant communities in different habitats, field surveys of species diversity of plant communities and morphological traits associated with the host plant were investigated. 1) The species had good growth in wetlands where the morphological traits (including stem length, leaf area and node length) of A. philoxeroides, showed a significant difference from that in other habitats (namely, road sides, cultivated land and lawn). However, there were significant differences in leaf area and node length between the disturbed habitats (road sides and cultivated land) and other habitats. The two morphological characteristics were related to adaption of the host plants to human activities and heat-drought stresses. 2) Based on the sample plot survey, the variation in relative coverage, frequency and densities, showed a certain pattern in the different invaded habitats. As the important value of the species was over 60.96%, plant species diversity was reduced in communities severely invaded by A. philoxeroides. The alien invasion plant could have huge impacts on native plant communities, and management supervision should be strengthened and managed through target-oriented procedures.

CLC Number:

ZHANG Zhen, XU Li, ZHU Xiao-min. Effect on species diversity of plant communities caused by invasion of Alternanthera philoxeroides in different habitats[J]. Acta Prataculturae Sinica, 2010, 19(4): 10-15.

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