Weidong Fu and Guoliang Zhang
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Mikania micrantha is a perennial invasive weed, which can seriously destroy the biodiversity in the invaded area. Biological substitution can not only effectively reduce the harm of M. micrantha, but also achieve ecological and economic benefits. According to the main habitat conditions of M. micrantha invasion, a variety of plants suitable for growing in the invaded area of M. micrantha were selected as alternative plants. In this research, we studied the effects of different plants on the prevention and control of M. micrantha. Plant height, biomass (fresh weight and dry weight), properties of root soil, chlorophyll content, leaf area, and the photosynthetic rate of alternative plants and M. micrantha were measured using pot experiments, in order to screen out the best alternative plants. The results showed that among the 15 alternative plants suitable for local habitats, Mosla chinensis and Stylosanthes guianensias had the best control effects on M. micrantha. When M. chinensis and S. guianensias were planted together with M. micrantha, the plant height and biomass of M. micrantha were the lowest of all the 15 groups. Further studies showed that M. chinensis and S. guianensias could inhibit the growth of M. micrantha without affecting its own growth. Compared with the control group, the leaf area, chlorophyll content and photosynthetic rate of M. micrantha showed a significant downward trend. The results of this study provide theoretical basis and technical support for the ecological control technology of M. micrantha.