Preliminary Study on the Restoration of Benthos in the Changjiang Estuary

27 Mar Preliminary Study on the Restoration of Benthos in the Changjiang Estuary

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Abstract

2004 年 3 月在新建的长江口南导堤通过投放以巨牡蛎为主的底栖动物, 开展底栖生物修复试验。 底栖动物的投放距离为 6 000 m, 平均投放生物量为 43.15 g·m- 2, 平均投放密度为 10.70 个·m- 2。 试验结果表明: 经过 15 个月, 已初步形成以附着型贝类为 主的底栖动物群落, 试验区底栖动物种类共有 21 种, 比本底值增加 19 种; 总生物量和 总密度分别为 26 489.43 g·m- 2 和 3 399.11 个·m- 2, 分别比本底值增加 40.31 倍和 7.50 倍; Shannon- Wiener 多样性指数为 0.98, 比本底值提高了 0.74。 其中巨牡蛎生物量和栖 息密度增加明显, 巨牡蛎的生物量和栖息密度分别为 19 328.84 g·m- 2 和 918.67 个·m- 2, 分别是所投放巨牡蛎生物量和栖息密度的 483.39 倍和 140.47 倍。

English Abstract

A restoration experiment of benthos was conduced on the new established southern guided dyke located the Changjiang River
estuary in March of 2004, in witch benthos (main Crassostrea Sp.) were put on the inter- tide zone of the dyke with 6 000 m long, mean
biomass being 43.15 g·m- 2 and mean density being 10.70 ind·m- 2 . The result shows that the benthos community with main adhesive mollusc
has been preliminarily formed after 15 months. In the experiment zone, the benthos reaches 21 species and increases 19 species, the biomass
and density are 26 489.43 g·m- 2 and 3 399.11 ind·m- 2 and increase 40.31 times and 7.50 times respectively, the Shannon- Wiener diversity
index is 0.98 and raises 0.74 comparing with the background. Among them, the biomass and density of Crassostrea sp. Increase obviously, the
biomass is 19 328.84 g·m- 2 and 483.39 times of putting biomass , the density is 918.67 ind·m- 2 and 140.47 times of putting density .