宁波海岛期间带生态学研究──Ⅱ．数量组成与分布

Studies on ecology of intertidal zone around Ningbo islands ──Ⅱ. quantities and distributions

本文研究了宁波海岛潮间带的生物数量组成与分布规律。岩礁潮间带平均生物量（２５１２．９４ｇ／ｍ２）高于沙质潮间带（４７．６４ｇ／ｍ２）高于泥沙质潮间带（２２．３６ｇ／ｍ２），而密度为岩礁潮间带（９８７．２个／ｍ２）高于泥沙质潮间带（２８１．２个／ｍ２）高于沙质潮间带（２０．０个／ｍ２）。主要生物类群有甲壳动物、藻类及软体动物。岩礁潮间带生物量从近岸向外海增加。泥沙质潮间带的生物量和密度从北至南增加。

Biomass of benthos in intertidal zone around Ningbo islands is larger on rocky shores (2 512. 94 g/m2) than that of sandy beaches (47. 64 g/m2) and muddy beaches (22. 36g/m2). And the density of benthos is larger on rocky shores (987. 2ind/m2) than that of muddy beaches (281. 2 ind/m2) and sandy beaches (20. 0 ind/m2). The biomass and density of crustaceans, molluscus and algae account for more than 90 percent of the main biomass and density. The biomass of rocky shore, including animals and algae, is larger on the islands near coast than those off coast. And the biomass and density of muddy beach is larger in lower latitudes. The vertical biomass distributions of benthos of rocky shores, sandy beaches and muddy beaches are also discussed.