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The aim of this study was to investigate the effects of light intensity and enhanced nitrogen supply on the growth and photosynthesis of the green-tide macroalga, Ulva prolifera. Thalli of U. prolifera were grown in natural or NH 4 +-enriched seawater under two different light intensities for 7 days, and then the growth rate, pigmentation, and photosynthetic performance of the thalli were evaluated. The results show that the relative growth rate(RGR) was markedly higher under the high light level than under the low light level. Enrichment with NH 4 + enhanced the RGR under high light intensity, but did not affect RGR under low light intensity. In low light conditions, NH 4 +-enrichment resulted in a marked decrease in the maximal photosynthetic rate( P m) and the maximum carbon fixation rate( V max), but it did not affect the half saturation constant for carbon( K 0.5) or the ratio of V max to K 0.5, which reflects the carbon acquisition efficiency. In high light conditions, P m, K 0.5, and the dark respiration rate( R d) increased under NH 4 + enrichment, but V max and the V max / K 0.5 ratio decreased. Regardless of the light intensity, NH 4 +-enrichment did not affect the apparent photosynthetic efficiency( α), which refl ects the ability of the alga to use light energy at low light levels. Under both low and high light intensities, the chlorophyll a(Chl a), chlorophyll b(Chl b), and carotenoids(Car) contents in thalli were higher in NH 4 +-enriched than in natural seawater, except that there was a decrease in the Chl b content of thalli in NH 4 +-enriched seawater under low light intensity. Therefore, NH 4 + enrichment improved the growth and photosynthetic performance of U. prolifera under high light intensity, but not under low light intensity. We discuss the possible mechanisms underlying these physiological responses.  相似文献   
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南麂列岛潮间带海藻资源与生态   总被引:8,自引:0,他引:8  
本文报道了1992年5月~1993年3月南麂列岛潮间带海藻四季调查结果。共鉴定大型海藻121种,隶属于66个属,其中红藻类82种,褐藻类25种,绿藻类12种,蓝藻类2种。海藻组成以暖温性与亚热带性种类占优势。海藻区系特征与台湾暖流和浙江沿岸流对本海域影响密切相关。该区域海藻的种类组成、数量分布和垂直分布,都有明显的季节变化。本文还分析了海藻分布与生态环境因子的关系,认为潮汐主导海藻的垂直分布,温度决定海藻分布的季节变化。  相似文献   
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