摘要
以浮游生物为主体的受控生态实验表明,溶解无机碳和DOC分别占海水碳贮库的89.75％和10.25％;在有机碳贮库中,浮游生物碳占5.43％,细菌碳占7.39％,表明细菌在海水碳循环中起重要作用,这种作用可从虾池样品分析获进一步证实。在食物链(14)C标记实验中,生物对碳吸收率随饵料密度增加而增加,由于饵料利用率的变化,应注意选择最适的饵料密度。鱼虾混养的^(14)C示踪实验表明:营养元素不断从低营养级向高营养级转移,各种生物样品^(14)C放射性活度平均百分比分别是,扁藻84.63％,卤虫8.99％,长毛对虾0.97％,棱鮻5.42％。
In the experiment of controlled ecosystem in which plankton was the main organism, dissolved inorganic carbon and DOC were estimated to be 89.75% and 10.25% respectively in the carbon reservoir in seawater. However, planktonic carbon and bacterial carbon were 5.43% and 7.39% respectively in the organic cabon reservoir, suggesting that bacteria played an important role in carbon circulation in seawater, which could be confirmed from the analyses of samples collected in shrimp ponds. Carbon absorption rates of organisms increased with the increase of food densities in ^(14)C- labelling experiment in the food chain, nevertheless, the optimum food density should be determined separately because the utilizable proportions of foods vary. Nutrient elements were continuously transported from lower trophic levels to higher trophic levels as shown in the ^(14)C-tracer study on the polyculture of fish and shrimp, and the average percentages of ^(14)C-radioactivity in the biological samples were 84.63% for Platymonas suboordiformis, 8.99% for Artemia salina, 0.97% for Penaeus penicillatus and 5.42% for Liza Carinatus.
出处
《海洋湖沼通报》
CSCD
北大核心
1992年第4期32-40,共9页
Transactions of Oceanology and Limnology
基金
国家自然科学基金资助批准号
No.3880644
关键词
碳
循环
海水
养殖
浮游生物
carbon circulation
marine culture
experimental study
