贵阳天河潭旱洞硅藻生物多样性与环境初步研究

Preliminary study on diatom biodiversity and environment in Tianhetan dry cave,Guiyang

为了研究喀斯特洞穴硅藻的分布和生物多样性,丰富和积累硅藻研究的基础理论数据,2008年12月对贵阳天河潭旱洞进行了野外考察。经实验室鉴定共发现硅藻7属27种(含变种),其中包括优势种7种。硅藻商为0,属和种的平均优势度分别为0.113和0.023,香浓维纳多样性指数值分别为2.60和4.43,均匀度均近似等于0.93,硅藻细胞平均密度为1609.36个/cm2。相对地表河流、湖泊(水库)、海洋等环境的硅藻生物多样性来说,天河潭旱洞硅藻生物多样性较高,但硅藻个体较小。硅藻与喀斯特洞穴环境具有很好的相关性,将硅藻作为喀斯特洞穴环境评价与监测的指示生物,具有重要的科学研究价值和理论现实意义。

In order to study the distribution and biodiversity of karst cave diatom,enrich and accumulate the basic theory date of diatom research, the authors conducted a field investigation in Tianhetan dry cave, Guiyang in December 2008. After identifying and analyzing in laboratory, 7 Genus and 27 species （including variation） were found in Tianhetan dry cave, among which 7 dominance species were included. The diatom quotient is zero, average dominance of biodiversity indexes of genus and species are 0. 113 and 0. 023, respectively and Shannon-Wiener indexes are 2. 60 and 4. 43, respectively, evenness degrees of both genus and species are approximately 0. 93, average cell density of diatom is 1 609. 36 cell/cm^2. The results also show that diatom biodiversity in Tianhetan dry cave is higher than in the river, lake （or reservoir） and ocean, but the diatom body in Tianhetan dry cave is relatively smaller. There is a good correlation between diatom and kast cave environment ,so make use of diatom as an indicator for the evaluation and monitoring of karst cave environment will be of important scientific research value, theoretical and actual significance.