淡水养殖水体溶解氧含量诊断分析及浮头泛塘气象预报

通过实时监测荆州农试站养殖塘各种水质要素，结合2011~2012年养殖塘发生的25个鱼泛塘实例，探讨了养殖水体溶解氧含量与气象要素之间的联系。分析表明:养殖水体溶解氧含量与6 h变温、总辐射量、气压值正相关，与水温、空气相对湿度值负相关。从平时的调查记录来看，鱼泛塘事件主要发生在5~10月间，湿度大、气温低、气压下降、日照强度弱等都会引起溶解氧含量低，严重的会诱发鱼泛塘。根据25个鱼泛塘实例，结合气象要素的特点，提出了急剧降温降压型、寡照型、高温高热型3种鱼泛塘发生条件的概念模型，分别以实例进行了验证，并初步总结出根据气象要素观测资料进行浮头泛塘预报的方法和流程

METEOROLOGICAL INFLUENCING ELEMENTS OF DISSOLVED OXYGEN CONCENTRATION IN FISH PONDS AND NEW MODELS TO FORECAST FISH FLOATING HEAD

Dissolved oxygen (DO) concentration in fish ponds has been widely directly related with fish floating head. Aiming at investigating the relationship between DO concentration and meteorological elements, water temperature and DO concentration in fish pond were observed online by Jingzhou agriculture meteorological trial station, and 25 actual cases were recorded from 2011 to 2012. It was indicated that DO concentration in fish pond was closely correlated with atmospheric temperature, water temperature, solar radiation, atmospheric pressure and relative humidity. In general, 6 h water temperature change (ΔT6), total radiation and atmospheric pressure were positively correlated with DO concentration; meanwhile, water temperature and relative humidity were negatively correlated with it. According to the daily investigating records, fish floating head events were mainly found between May and October, when relative humidity was increasing, atmospheric temperature was decreasing, atmospheric pressure was reducing, or light intensity was becoming weak, water DO concentration was always dropped significantly. According to the 25 cases, combined with the characteristics of meteorological factors, three concept models were put forward. Moreover, fish floating head forecast method and processes according to the data of meteorological observation were proposed preliminarily