青岛太平湾砂质潮间带小型底栖生物丰度和生物量的研究

Study on the Abundance and Biomass of Meiofauna in the Sandy Beach of Taiping Bay,Qingdao

于2004年10月-2005年10月对青岛太平湾砂质潮间带进行了小型底栖生物的逐月采样，对丰度和生物量进行定量研究。结果表明，小型底栖生物的年平均丰度为（1025．40±268．84）ind·10cm^-2平均生物量为（1195．87±476．53）μdwt·10cm^-2，平均生产量为（10762．80±4288．77）μgdwt·10cm^-2a^-1。小型底栖生物在丰度和生物量上呈现了明显的季节变化，高值主要出现在4，5，6月，而低值在8，9月。共鉴定出12个类群，线虫在丰度上占绝对优势（89．2％）。按生物量，多毛类占46．9％。其次为线虫31％。其它较多的类群还有涡虫、桡足类、腹毛虫、寡毛类等。50％以上的小型底栖生物分布在0～4cm表层，冬季部分向下迁移。Pearson相关分析表明，小型底栖生物数量对间隙水溶氧表现出明显的滞后效应，而与盐度、pH和沉积物环境因子相关性不明显。

The abundance and biomass of meiofauna were quantitatively investigated in the sandy beach of Taiping Bay, Qingdao based on monthly sampling from Oct. 2004 to Oct. 2005. The results showed that the average abundance, biomass and production were （1 025.40 ±168.84）ind·10cm^-2, （ 1 195.87±476.53）μg dwt·10cm^-2 and （ 1 0762.80±4 288.77）μg dwt·10cm^- 2a^-1 respectively. Meiofaunal abundace and biomass varied seasonally with peak values in April, May and June 2005 and low numbers in August and September. 2005. A total of 12 meiofauna groups were identified. The most dominant group was nematode, accounting for 89.16% of the total abundance. In terms of biomass, polychaetes accounted for 46%, nematode 31%, the remaining groups included turbellaria, gastropda, copepoda, oligochaeta, etc. Over 50 % of the meiofauna concentrated in the top 0-4cm, migrating downtowards in winter. Pearson correlation analysis showed meiofauna abundance enjoyed an obvious lag effect on the 02 concentration in the interstitial water. However, there were no significant correlations between meiofauna abundance and other environmental factors.