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本文介绍了用氧电极法测定广东沿海大量生产的细基江蓠、海南岛水池产江蓠、江蓠和海丰产江蓠生态种的光合活性同光强关系的结果。试验结果表明:初夏时,四种江蓠的光补偿点为1000米烛光,光饱和点为400—7000米烛光;12月和翌年2月,江蓠和细基江蓠的光饱和点为 12,000和 14,000米烛光。12月和翌年2月两次测定的结果相同,但和初夏时比较相差悬殊。初夏时江蓠的净光合速率较低,12月和翌年2月时较高。1983 年初夏时,发现海南岛水池产江蓠分枝的净光合速率大于主枝,这现象在1984年2月对江蓠和细基江蓠的测定中亦得到证实。细基江蓠孢子体顶端部净光合速率大于中部和基部,而中部和基部的净光合速率无明显差异。这些研究结果,为江蓠人工栽培,和江蓠“切割增产”提供了科学依据。
In this paper, the results of the relationship between photosynthetic activity and light intensity of the ecotypes of Elaeocarpus sibirica, Elaeocarpus przewalskii, Jiangbei and Haifeng producing Eruca sativae produced in coastal areas of Guangdong Province by oxygen electrode were described. The experimental results show that the light compensation point of the four kinds of jiangxi is 1000 meters of candle light and the light saturation point is 400-7000 meters of candle light in early summer. In December and the following February, the light saturation point of jiangxi and jianyi rivers is 12,000 And 14,000 meters of candle light. The results of the two tests in December and February of the following year are the same, but they are quite different from those in early summer. The net photosynthetic rate of Gracilaria was lower in early summer, higher in December and the following February. In the early summer of 1983, it was found that the net photosynthetic rate of the stems of the Gracilaria graminicola in the pool of Hainan Island was larger than that of the main branch. This phenomenon was also confirmed in the test of the Gracilaria and Gracilaria in February 1984. The net photosynthetic rate at the apical part of Ampelopsis grossedentata was greater than that in the middle and basal parts, while there was no significant difference in the net photosynthetic rate between the middle part and the basal part. These findings provide the scientific basis for the artificial cultivation of Jiangbei and the cutting and yield increase of Jiangbei.