【摘要】 <正> 沿岸带底栖海藻的垂直分布情况比较复杂。在黄海沿岸潮间带不仅有绿藻,而且有许多褐藻和红藻,有些褐藻不仅生长茂盛而且数量很多。显然,它们对于潮间带的这种特殊的生态环境是能够适应的。 底栖褐藻的光合作用与光照条件的关系是决定其垂直分布的重要因素之一。Kage yama和Yokohama测定过分别生长在潮间带中部、低潮线和低潮线下15米深处的四种褐藻的光合作用与光强的关系。他们认为底栖褐藻的光合作用也有适应高光强的种类,更多还原

【Abstract】 The effect of light intensity on rates of photosynthesis were measured for nine species of marine benthic brown algae in the coastal area in western Huanghai sea (yellow Sea). The benthic marine algae measured were Punctaria latifolia, Colpomenia sinuosa, Ectocarpus corfervoides, Sphacelaria subfusca, Sargassum thunbergii, Scyto-siphon lomentarius, Sargassum kjellmanianum, Undaria pinnatifida and Laminaria ja-ponica. The first four species were collected from middle intertidal zone; S. thunbergii and S. lomentarius from lower intertidal zone; S. kjellmanianum from a rock pool in middle intertidal zone; and remaining two species, U. pinnatifida and L. japonica, were sublittoral, the former on rock below lower littoral zone and the latter on floating cultivation raft about 1 m. below sea surface. The experiments were conducted at 20℃.The results of the measurement indicated that the light saturation values of pho-tosynthetie light curves were higher for the seven species from the intertidal zone, S. lomentarius, P. lotifolis and E. corfervoides saturated approximately at 25000 lux, S. kjellmanianum, S. thunbergii and S. subfusca at 3000 lux and C. sinuosa at 32000 lux. The light saturation values for the two species from the sublittoral zone were lower, being slightly more than 10000 lux.The above results show that marin benthic brown algae growing in the intertidal zone, as well as the benthic green algae, are adapted to high light intensity, differing remarkably from the algae growing in the sublittoral zone which is adapted to low light intensity.更多还原