Given its high root regeneration ability and adaptation capacity, would predominate the resource competition with other plant species. As an invasive alien species, it has caused serious damages to the coastal ecosystem of China. We explored the impacts of invasion on the growth and expansion of mangroves around the coastal zones around Guangxi Shankou Mangrove National Nature Reserve (GSMNNR). The area of and mangroves in the GSMNNR was analyzed based on a sequence of Landsat satellite multispectral images collected during 1995 to 2019. The results showed that predominated in the competition with mangroves without human intervention. The area of decreased under the conditions of cutting, rooting and other management measures, while the average annual growth rate of mangrove area correspondingly increased. It indicated that the invasion of would inhibit the growth and expansion of mangroves. The management measures, such as mowing and rooting, could weaken the negative impacts of on mangroves. Mangroves could thus be effectively protected. This study could provide quantitative scientific data for management and the protection of the mangrove ecosystem in the GSMNNR, and thus be a valuable reference to the prevention on a larger scale of and the formulation of further protective measures for mangroves.
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