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

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, 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/cm2. 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 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.