虾塘养殖水环境中氮磷营养盐的存在特征与行为

FEATURE AND BEHAVIOR OF NITROGEN AND PHOSPHOROUS NUTRENTS IN SHRIMP PONDS

根据现场调查结果，讨论了虾塘养殖水环境中氮磷营养盐的存在特征与行为。在该水环境中，ＩＰ的季节变化相对平稳，而ＩＮ则在养殖中后期变化幅度较大；ＩＮ和ＩＰ的垂直分布均匀；ＩＮ的形态分布有着显著的季节变化，且与开阔浅海不同，ＮＯ２－Ｎ也成为ＩＮ的主要存在形态；ＩＮ与ＩＰ比值始终较低，且ＩＮ在对虾养殖期间的大部分时间内都处于贫瘠水平，从而构成该养殖水环境中初级生产的限制因素；而相对较高密度的浮游植物，则是缩短该水环境中ＩＮ和ＩＰ循环周期的主要原因。

Of nitrogen and phosphorus nutrients of shrimp ponds,feature and behavior were discussed according to investigaton results.Seasonal change of IN was much bigger,especially in last period of shrimp culture,than that of IP which was stable during the shole culture period.Both IN and IP of vertical distribution were even in the waters.There was obviously seasonal change on IN fo existing form.Moreover,it was different from the open waters that NO 2 - N was also one of the main IN forms.In the most culture period,IN was in the poor level and ,therefore,became the main restrict factor of photoplankton productivity.Otherwise,circling rate of IN and IP could be increased by higher density photophankton in shrimp ponds.