北海市主要红树林群落物种组成研究

Species composition of main mangrove community in Beihai city

为探究广西北海大冠沙、党江以及山口地区的红树林群落组成与结构,以其红树林内典型红树林群落作为研究对象,设置8个样地进行典型取样,调查内容主要包括红树林群落物种的种类、株数、盖度以及幼树、幼苗层树种的种类、数量和高度。结果表明:大冠沙地区白骨壤群落林相整齐,群落结构单一,仅生长有白骨壤树种,且林下无幼苗,亦未见有其他植物生长。党江地区桐花树群落长势繁茂,林下桐花树幼苗生长密集;该地区无瓣海桑人工林群落树体高大,树冠较稀疏且连续。山口地区秋茄群落冠幅较大,林下稀疏,秋茄根部发达且粗壮,该群落伴生有桐花树、白骨壤、红海榄;该地区的秋茄、木榄群落内均伴生有其他树种且林下有幼苗以及幼树更新。

The experiment aim to explore the composition and structure of mangrove community in daguan- shaDaguansha, Dangjiang and Shankou area of Beihai Guangxi, the typical mangrove community which in its mangrove forest was taken as the research object and eight sample sites were set up for typical sampling. The survey mainly included species, number and coverage of mangrove community, and species, number and height of saplings and seedlings. The results showed that, in the Daguansha area, the avicennia marina commu- nity was homogeneous and the community structure was single. There were no seedlings under the forest. The aegiceras corniculatum community in Dangjiang area was flourishing and the seedlings which under the forest were dense. In this area, the Sonneratia apetala artificial forest community was tall with sparse canopy and con- tinuous canopy. The kandelia candel community in Shankou area had large crown width, sparse forest under- growth and the root of kandelia candeld was robust. In this community associated with aegiceras corniculatum, avicennia marina and rhizophora stylosa. In this area, There were other tree species grew in kandelia candel and bruguiera gymnorrhiza community and the seedlings and saplings under the forest were renewed.