estuaries

increased salinity in estuaries could reduce the abundance of freshwater species but could increase the presence of marine species.

河口水质变咸可会减少淡水鱼的品种数目，相反该地区海洋鱼类的品种也可能相对增多。

in many temperate estuaries, oyster reef is a very special marine habitat which plays many important ecological functions such as purifying water body, providing aquatic animals' habitat, protecting biodiversity, and coupling ecosystem energy flow.

在许多温带河口区，牡蛎礁是具有重要生态功能的特殊生境。牡蛎礁在净化水体、提供栖息生境、保护生物多样性和耦合生态系统能量流动等方面均具有重要的功能。

This paper expounds characteristics of the estuary hydrology and research results, and presents the current situation of hydrologic research on the estuary of the Dujiang River, and puts forward some countermeasures for development of China's hydrologic research on estuaries.

本文阐述了河口水文学特点及研究成果，介绍了长江河口水文研究现状，并提出了我国河口水文研究发展对策。