摘要
经测定,海带生长部及其附近组织的光合强度、光合饱和点比中上部,比紫菜低,强光抑制海带生长部及其附近组织生长。只有在较强光照下,海带中上部光合潜力才能充分发挥。筏式平养的海带受光条件与上述要求相反。在凹凸期,二绳海带中间挂一或二根紫菜绳,脆嫩期后,提高海带放养水层,并把挂在中间的紫菜绳移至海带绳近旁,结果提高了海带中上部受光条件,又使生长部得到适当遮光,免受了提高放养水层的强光刺激,促进了海带的生长,提高海带产量和质量。在基本不增加养殖成本下获得一定数量的紫菜,提高了养殖经济效益。
Experiments have shown that the gvewing part of L. japonica does not need a strong light because such a light restrains its grawth; on the other hand, the centro-upper part of the help can best levelop its photosynthetic potentialities only when subjected to comparatively strong lights. In the raftmethod level cultivation of L. japonica the lighting conditions are just the opposite of the above requirements, In am intercropping system, one or two ropes of Porphyra are hung between two ropes of L. japonica during the concave-convex phase; ofter the fragile-delicate phase, the Porphyra ropes are moved close to the ropes of L. japonica. In this way, the entire lighting condition of the latter is improved, the resnlt is a rise in the output and qualily, of L. japonica plus a certain amount of Porphyra yields.
