大亚湾海域低营养盐维持高生产力的机制探讨Ⅰ  

THE MECHANISM OF LOW NUTRIENTS-HIGH PRODUCTIVITY IN DAYA BAY

作　　者：郑爱榕[1] 沈海维[1] 刘景欣[1] 李文权[1] 陈清花[1] 

机构地区：[1]厦门大学海洋系,亚热带海洋研究所361005

出　　处：《海洋科学》2001年第11期48-52,共5页Marine Sciences

基　　金：中国科学院大亚湾海洋生物开放综合实验站基金资助课题P9907。

摘　　要：利用2000年4月大亚湾海域的现场调查数据 ,分析水体中各种形态氮的含量、分布、转化及其影响因素 ,探讨大亚湾海域低营养盐维持高生产力的原因。调查结果表明 :大亚湾海域水体仍属贫氮海区 ,氮、磷比约为12:1 ,生产力水平依然受氮控制 ;大亚湾海域氮以溶解态的形式居多 ,占总氮的74.8 % ,颗粒态占25.2% ;而溶解态中又以有机氮居多 ,占总氮的62.1 %。孵化实验表明 :(1)充氧条件下氨氮向硝氮转化 ,缺氧条件下硝氮向氨氮转化 ;(2)水体中溶解有机氮在有氧条件下可以降解转化为无机氮。这意味着占绝对优势的溶解有机氮降解转化为无机氮可能是大亚湾海域低营养盐维持高生产力的主要原因之一。Ammonia(NH 4 N), nitrous(NO 2 N), nitrate(NO 3 N) and dissolved organic nitrogen (DON) in Daya Bay in April, 2000 were measured. Content, contribution and transformation of nitrogen species were described and their relationship with environmental factors was discussed. The results show that N/P is about 9∶1 in Daya Bay seawater, suggests that productivity is still controlled by nitrogen. The test of incubation indicate that:(1) Inorganic nitrogen and their transformation relate to oxido reduction environment, nitrous was reduced to ammonia when oxygenpoor. Ammonia were conversed to nitrous when oxygen rich and; (2)DON makes up 62% of the total mitrogen could be degraded into inorganic nitrogen under the condition of oxygen rich, may be a principal cause result in lower nutrients higher productivity.

关 键 词：低营养盐 高生产力 机制 大亚湾 海域 海水氮 海洋生态系 

分 类 号：Q178.53[生物学—水生生物学] P734.2[生物学—普通生物学]