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碱度(Alk)是水体中氢离子接受体(如弱酸根、多元酸根、氢氧根等等)浓度的总和。它与温、盐、深、生物活动及碳酸盐的溶解和沉淀等有关;在河口港湾中,则主要受大陆径流、潮汐作用等水文因素影响,其次还受生物活动的影响。本调查区中Ⅰ区碱度的时空分布受河水和潮汐的影响较小,呈现浅海碱度的时空分布特征;Ⅲ区碱度的时空分布则受九龙江水和潮汐的强烈影响,呈现河口海域碱度的时空分布特征;Ⅱ区或多或少地受九龙江淡水的影响,其时空变化也或多或少地具有Ⅰ区和Ⅲ区的某些特征,大致呈过渡状态。本调查区碱度与盐度(或氯度)存在着紧密的正相关关系。
Alk is the sum of the concentrations of hydrogen ion acceptors such as weak acid radicals, polybasic acids, hydroxide and the like in water. It is related to the temperature, salt, depth and biological activities as well as the dissolution and sedimentation of carbonate. In estuarine estuary, it is mainly affected by hydrological factors such as continental runoff and tidal effects, and secondly by biological activities. The temporal and spatial distribution of alkalinity in area Ⅰ of this survey area is less affected by the influence of rivers and tides and shows the temporal and spatial distribution of alkalinity in shallow sea. The temporal and spatial distribution of alkalinity in area Ⅲ is strongly influenced by water and tide in Jiulong River, Degree of spatial and temporal distribution characteristics; Ⅱ area more or less affected by the fresh water in Jiulongjiang, its temporal and spatial changes have more or less some features of Ⅰ and Ⅲ area, roughly the transitional state. There is a close positive correlation between alkalinity and salinity (or chlorinity) in this survey area.