Effect of nitrogen and phosphorus supply on growth, chlorophyll content and tissue composition of the macroalga Chaetomorpha linum (OF Mull.) Kutz in a Mediterranean coastal lagoon
Effect of nitrogen and phosphorus supply on growth, chlorophyll content and tissue composition of the macroalga Chaetomorpha linum (OF Mull.) Kutz in a Mediterranean coastal lagoon
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DOI：
10.3989/scimar.2002.66n4355
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发表时间：
2002-12-01
期刊：
影响因子：
1.4
通讯作者：
Comín, FA
中科院分区：
文献类型：
--
作者：
Menéndez, M;Herrera, J;Comín, FA
在实验室条件下，研究了在西班牙东北部埃布罗三角洲坦卡达的地中海沿岸泻湖中，溶解营养物质对亚麻毛藻生长、营养含量和吸收速率的影响。水中富含不同形态的氮，如硝酸盐或铵和磷。增施N、P或同时施N、P均可显著提高组织中这些营养物质的含量。增施N肥后，处理4d后，叶绿素含量增加，但只有在不加P的情况下，才有显著差异。在所有处理中，生物量在10天后都有所增加。这一增幅在N+P处理中较高。在所有处理中，当添加营养物质时，吸收速率显着高于对照罐子。单施氮、铵、磷的吸收速率显著高于N+P处理，而N+P处理对N、As、P的吸收速率显著高于N+P。在富磷培养中，大型藻类组织的最终磷含量是初始组织浓度的十倍，因此表明大量的磷吸收。此外，在孵化结束时，N/P比增加到80，表明Tancada泻湖亚麻黄的限制因子不是N，而是P。氮的相对较高有效性与环礁湖周围稻田的氮输入和沉积物中磷的结合有关。
The effect of dissolved nutrients on growth, nutrient content and uptake rates of Chaetomorpha linum in a Mediterranean coastal lagoon (Tancada, Ebro delta, NE Spain) was studied in laboratory experiments. Water was enriched with distinct forms of nitrogen, such as nitrate or ammonium and phosphorus. Enrichment with N, P or with both nutrients resulted in a significant increase in the tissue content of these nutrients. N-enrichment was followed by an increase in chlorophyll content after 4 days of treatment, although the difference was only significant when nitrate was added without P. P-enrichment had no significant effect on chlorophyll content. In all the treatments an increase in biomass was obseved after 10 days. This increase was higher in the N+P treatments. In all the treatments the uptake rate was significantly higher when nutrients were added than in control jars. The uptake rate of N, as ammonium, and P were significantly higher when they were added alone while that of N as nitrate was higher in the N+P treatment. In the P-enriched cultures, the final P-content of macroalgal tissues was ten-fold that of the initial tissue concentrations, thereby indicating luxury P-uptake. Moreover, at the end of the incubation the N:P ratio increased to 80, showing that P rather than N was the limiting factor for C. linum in the Tancada lagoon. The relatively high availability of N is related to the N inputs from rice fields that surround the lagoon and to P binding in sediments.