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A 2-year study on Koppophycus alvorezii (Doty )Doty introduced to Hainan Island from the Philippines in 1985 showed promising results.The average daily growth in weight reached 10% at a favourable temperature of about 26℃. Experimental results showed that timely cutting of the plant was an effective way to obtain new cuttings for cultivation and accelerate growth. New cuttings 0.05 kg in weight are suggested to be used as " seeds" and the old plant should be harvested. At present, artificial cultivation with a type of underwater raft applicable in places where there is strong wind will expand cultivation to more regions in Hainan Province. 相似文献
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于1981年在青岛近海采集真江食、石花莱和角叉菜样品,用氧电极法测定它们在不同生长季节和发育阶段的光合和呼吸速率,并研究不同温度对其光合和呼吸速率的影响,同时计算出它们的呼吸温度系数。结果表明,3种红藻具有典型的潮间带海藻的光合特性,即高光饱和点为600—1000μE/(m2·s),较高的光补偿点为12-40μE/(m2·s)和较高的光合适温≥25℃。温度对3种红藻的光合和呼吸的影响均很明显,在5,15,25℃下测试,它们的最高光合和呼吸速率都出现在25℃。3种红藻的呼吸温度系数(Q10),在5-15℃较高,为1.4-5.5在15-25℃较低,为1.1-2.7。说明它们在低温下的呼吸受温度变动影响较大。经计算3种红藻在适宜生长温度下的净光合速率:角又菜和真江蒿在15℃分别为4.90O2mg/(g·h)和8.14O2mg/(g·h);石花菜在25℃为11.87O2mg/(g·h),在3种红藻中最高。这说明,石花菜的光合效率并不象人们预料的那样低,其秋季幼体在25℃,1000μE/(m2·s)光强下,净光合速率达到19.19O2mg/(g·h)。看来在自然界石花菜生长缓慢主要是由于生境中低光照强度和较低水温所致。 相似文献
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