枸杞岛铜藻种群分布的季节变化  

Seasonal variations of Sargassum horneri distribution around Gouqi Island of East China

作　　者：毕远新[1] 章守宇[1] 吴祖立[1] 

机构地区：[1]上海海洋大学海洋科学学院,上海201306

出　　处：《生态学杂志》2013年第5期1255-1259,共5页Chinese Journal of Ecology

基　　金：国家海洋公益性行业科研专项(201005013-3);国家自然科学基金项目(41176110)资助

摘　　要：为了查清铜藻(Sargassum horneri)的时空分布,并探明大型海藻场生态保护及修复的方法,采用水下样方法,对枸杞岛铜藻种群藻苗和成藻两个时期的分布变化情况进行了跟踪调查。结果表明:铜藻幼苗到成藻阶段密度平均损失率达61%,除了波浪作用对附着牢度差的铜藻造成移除作用外,密度制约机制可能也起了一定作用;铜藻幼苗时期水深分布范围为121～547cm,而成藻时期为132～461cm,铜藻垂直分布的宽幅缩小,而且不同站点间的水深分布宽幅变化较大,这与站点间环境因子影响程度不同有关;尤其是对分布在水深上限的铜藻来说,暴波强度的影响可能占主要作用;铜藻的生长速度与海水透明度相关,波浪的作用可能导致了沉积物再悬浮影响光照强度,抑制铜藻生长;光照强度降低是否会导致铜藻死亡还需做进一步研究,以便查清铜藻垂直分布上移的现象。In order to clarify the spatiotemporal distribution of Sargassum horned, and approach the possible measures to ecologically protect and restore macroalgal bed, an investigation was conducted on the seasonal distribution of S. horneri from seedling to maturing stages in Gouqi Is- land of East China by the method of underwater quadrat sampling. From seedling to maturing sta- ges, the average loss rate of S. horneri density reached 61% , which was mainly determined by the wave action that moved the S. hor^ri from its substrate, and to some extent, affected by the density restriction mechanism. Most of the individuals were found within a water depth of 121- 547 cm during seedling stage, and a water depth of 132-461 cm during maturing stage. The width of S. hor^ri vertical distribution not only decreased from seedling stage to maturing stage, but also varied obviously among sampling sites, which was related to the effects of environmental factors. In addition, wave exposure had important effects on the distribution of S. hor^ri, espe- cially on the upper limit of distribution. The growth rate of S. horneri had a correlation with sea- water transparency. Wave action could result in the resuspension of sediments, which affected the light intensity, and thus, restrained the growth of S. horneri. It was unclear whether the de- crease of light intensity would result in the death of S. homeri. Further researches would be nee- ded on the relationships between light intensity and S. homeri growth density to understand the upward distribution mechanism of S. horneri.

关 键 词：铜藻 岩礁 沉积物 暴波 密度 株高 

分 类 号：S567.19[农业科学—中草药栽培]