“低盐区”有时用来描述盐度相对较低的海域,它并没有定量的划分依据,也没有特指的海域,因而在海洋学中还不是一个成熟的概念。在传统的海洋学理论研究中没有对低盐区的专门研究,低盐区也未被看成重要的海洋现象,因此,低盐区的环境和生态意义一直未引起人们足够的关注。但是,勿庸置疑,低盐区是在近岸海域研究中经常遇到的客观现象,例如迳流入海在河口区形成典型的低盐区(侍茂崇等,1985;程天文等,1985)、夏季雨 Sometimes used to describe areas of relatively low salinity, the “low salt zone” is not based on a quantitative basis nor a specific sea area and is therefore not a mature concept in oceanography. There is no special research on the low salt area in the traditional oceanographic theory research and the low salt area has not been regarded as an important ocean phenomenon. Therefore, the environmental and ecological significance of the low salt area has not drawn enough attention. However, there is no doubt that the low salt area is an objective phenomenon often encountered in the study of nearshore waters. For example, the inflow of sea leads to the formation of a typical low salt area in the estuary area (Shi, et al., 1985; Cheng et al., 1985) Summer rain