珠海鹤洲北其他种入侵人工恢复红树林群落的季节动态

通过设置固定样地,在不同的季节对鹤洲北人工种植的木榄(铲除杂草,整平滩涂种植1年)、秋茄(铲除杂草,整平滩涂种植1年)、无瓣海桑(种植3年)群落进行调查,分析各样地群落物种数量、群落优势度、无瓣海桑林下幼苗更新的季节动态。调查分析结果如下:①各样地物种数量随季节变化波动明显,种类组成不稳定。木榄样地薇甘菊的入侵直接提高了物种数量随季节变化的波动幅度。②人工种植的木榄和秋茄的优势度随时间的推移直接降低,无季节性消长,薇甘菊和其他禾本科植物的入侵降低了两者的成活率。③无瓣海桑优势度季节变化明显,禾本科和菊科等入侵的植物种无法定居,群落生境稳定,为其他红树植物的生长提供了有利的生存环境。

Seasonal variation of community of artificial restored mangrove in North Hezhou of Zhuhai invaded by other species

By setting fixed plots,we surveyed and analyzed all sorts of communities of Bruguiera gymnoihiza(planted for one year on leveling beach and weeds control),Kandelia candel(planted for one year on leveling beach and weeds control) and Sonneratia apetala(planted for 3 years) in the north Hezhou of Zhuhai,and investigated the species number,dominance,and regeneration of S.apetala seedlings.The results are as follows.Plant species changed a lot with the season,and the species composition is unstable.Mikania micrantha invasion directly increased the fluctuation of plant species with the season.The dominance of major communities of artificial restored B.gymnoihiza and S.apetala was reduced directly by time,and their survival rates were reduced by the invasion of M.micrantha and other Poaceae grasses.The dominance of S.apetala markedly changed with the season;the invasion of Poaceae and Asteraceae plants could not settle down,leading to a stable biotope suitable for the growth of other mangroves.