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本文报道了杭州湾畔对虾养殖池水的化学状况。1990年6—10月和1991年7—8月内所观测的虾池水化学成分平均值分别为:总含盐量9.5g/l,碱度1.79m mol/l,pH8.98,阴阳离子含量最高者分别为Cl~-(5.5g/l)与Na~++K~+(3.1g/l),为典型河口水质特点,但仍属海水水质体系,即系氯化水,钠组,Ⅲ型(Cl_Ⅲ~(Na))。有效氮含量丰富,总量平均为1.65mg/l,其中总氨氮占56%,硝酸氮占39%,亚硝酸氮占5%,可溶性有效磷含量较低,仅为0.012,N/P=304(原子比)化学耗氧量(COD_(Mn))17.4mg/l,可溶性有机物与悬浮颗粒有机物含量近为相等。据观测结果与多年生产状况,认为河口区虾池每59小时排换水量约40%,3—4cm虾苗放养密度为18.0±3.0万尾/公顷的管理方式较为合理
This paper reports the water status of shrimp culture ponds in Hangzhou Bay. The average chemical compositions of shrimp ponds observed from June to October in 1990 and from July to August in 1991 were as follows: total salinity 9.5g / l, alkalinity 1.79m mol / l, pH8.98, The highest one is Cl ~ - (5.5g / l) and Na ~ ++ K ~ + (3.1g / l), which are the characteristics of typical estuary water quality, but still belong to seawater quality system, Type Ⅲ (Cl_Ⅲ ~ (Na)). The available nitrogen content is rich, the total amount is 1.65mg / l on average, among them total ammonia nitrogen accounts for 56%, nitrate nitrogen occupies 39%, nitrite nitrogen accounts for 5%, soluble phosphorus content is low, only 0.012, N / P = 304 (Atomic ratio) chemical oxygen demand (COD Mn) 17.4mg / l, soluble organic matter and suspended particles nearly equal organic content. According to the observation results and the status of production for many years, it is considered that the management method of excreting water volume per hectare in the estuary area is about 40% and the stocking density of 3-4cm shrimp seedlings is 18.0 ± 30,000 ha / ha