江蓠在不同水层中的光合作用与生长

本文报道了1962年和1980年两次在汕尾港进行江蓠在不同水层中的光合作用试验及生长情况观察的结果。两次试验的结果基本一致：(1)越接近海水表面江蓠的光合作用越旺盛，生长速度也快；越向水的深层江蓠的光合作用越差，生长速度也越慢。(2)海水的透明度深度似乎成了相抵深度，即在透明度深度的水层中江万光合作用产生的氧几乎等于江蓠呼吸作用所消耗的氧。在该深度以下的水层中，江蓠几乎停上生长。在进行江蓠人工栽培的时候，应考虑尽量采用浮筏式栽培，使江蓠藻体悬浮水面，可获得高产。在透明度较大的海区，可考虑采用垂下式浮筏栽培，但最好在水深1．5米以内，可望获得高产。

RATE OF PHOTOSYNTHESIS AND GROWTH OF GRACILARIA VERRUCOSA IN DIFFERENT LAYERS OF SEAWATERS

Rate of photosynthesis and growth of Gracilaria verrucosa in different layers of seawaters in Shanwei Wan was observed in our experiments in 1962 and 1980 respec-tively. The results obtained from these experiments are almost the same. 1. When the algae was reared near the surface layer of seawaters, the rate ofphotosynthesis and growth was fast. On the contrary if it was reared in the lower layerof seawaters, their rate of photosynthesis and growth was slow. 2. There is a compensation layer of the depth of transparency in the sea waters.At this layer the amount of oxygen produced in the photosynthesis is slmost equal tothat consumed in the respiratory process of the algae. Below this depth of transparencyin seawaters, the growth of the algae nearly stopped. In order to get a good harvest in the artificial raft cultivation, Gracilaria shouldbe float near the surface of seawaters. If the transparency of seawater is high, thealgae should be cultivated on the ropes hanging from the raft to proper depth, thelength of the ropes should not exceed 1.5 meter.