Changes of the area of Spartina alterniflora and mangroves in Guangxi Shankou Mangrove National Nature Reserve from 1995 to 2019.

doi:10.13287/j.1001-9332.202202.015

Abstract

Abstract: Given its high root regeneration ability and adaptation capacity, Spartina alterniflora 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 S. alterniflora invasion on the growth and expansion of mangroves around the coastal zones around Guangxi Shankou Mangrove National Nature Reserve (GSMNNR). The area of S. alterniflora 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 S. alterniflora predominated in the competition with mangroves without human intervention. The area of S. alterniflora 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 S. alterniflora would inhibit the growth and expansion of mangroves. The S. alterniflora management measures, such as mowing and rooting, could weaken the negative impacts of S. alterniflora on mangroves. Mangroves could thus be effectively protected. This study could provide quantitative scientific data for S. alterniflora 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 S. alterniflora and the formulation of further protective measures for mangroves.

Key words: Spartina alterniflora, mangrove, ecosystem, ecological competition, satellite image

SHEN Hong-kun, ZHAO Bo-yi, CHEN Ming-yang, HUANG Rong-yong, YU Ke-fu, LIANG Wen. Changes of the area of Spartina alterniflora and mangroves in Guangxi Shankou Mangrove National Nature Reserve from 1995 to 2019.[J]. Chinese Journal of Applied Ecology, 2022, 33(2): 397-404.

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