辽宁长海县海域营养状况季节分析与评价

Seasonal variation and evaluation on nutrients in Changhai water,Liaoning

根据2007年1月、4月、7月和10月对长海县水域调查结果,分析并评价了该海域营养状况的季节变化。结果表明,长海县海域TN含量范围在211.26～1364.19μg/L,溶解态占43%～87%。总无机氮(TIN)是浮游植物生长吸收的主要氮源,长海海域TIN含量范围在2.85～359.98μg/L,占TN的16%～53%。NO3-N是TIN的主要存在形式,占61%～93%。不同的营养盐季节分布不尽相同。TIN季节分布表现为秋季>冬季>夏季>春季;PO4-P季节分布为冬季>秋季>春季>夏季;SiO4-Si季节变化为夏季>冬季>秋季>春季。长海海域浮游植物在调查期间为P限制,且该海域属贫营养水平。

According to the investigation results in Jan.Apr.Jul.and Oct.2007,the nutrients status was analyzed in Changhai County,Liaoning.The results showed that TN amount ranged 211.26～1364.19 g/L,and dissolved nitrogen was 43%～87% of TN.The content of total inorganic nitrogen（TIN） was 2.85～359.98 g/L,and it was major nitrogen resource for phytoplankton,16%～53% of TN.Nitrate was the most form of TIN,the proportion of nitrate was 61%～93% of TIN in Changhai Waters.The distribution of nutrients was different in same season.The seasonal distribution for TIN showed autumn winter summer spring.The seasonal distribution of phosphate was winter autumn spring summer,and silicate summer winter autumn spring.During the investigation,the growth of phytoplankton was limited by P,and the eutrophication status in this water was oligotrophic.