不同环境因子对莫氏马尾藻幼苗生长和光合色素的影响

摘要

研究了在不同温度、盐度、光照强度、营养盐质量比例和水深下莫氏马尾藻(Sargassum mcclurei)幼苗生长和光合色素的变化.结果表明,莫氏马尾藻幼苗生长的适宜温度为12～ 20℃,最适宜温度为12℃,温度高于24℃时生长受到抑制,藻体有腐烂现象;其生长的适宜盐度范围为22 ～ 28,其中盐度为28时生长最快,低于13时生长缓慢甚至受到抑制,并出现发白腐烂现象;其适宜光照强度为1 000～3 000 lx,光照强度过高时藻体有发白腐烂的现象;其生长的适宜营养盐比例为m[硝酸钠(NaNO3)]∶ m[磷酸二氢钾(KH2PO3)]=15∶1;其适宜水深为30 cm,水深大于60 cm时生长受到抑制.%We studied the effects of different temperature,salinity,light intensity,nutrient mass ratio and water depth on growth and photosynthetic pigments of seedlings of Sargassum mcclurei.The main results are as follows:the suitable temperature and salinity for S.mcclurei growth are 12 ～ 20 ℃ and 22 ～28,and the optimal growth temperature and salinity are12 ℃ and 28,respectively.Resistance and decay of seedlings occur when the temperature is above 24 ℃ or the salinity below 13.Seedlings grow quickly under 1 000 ～3 000 lx light intensity; but when the light intensity is too high,seedlings rot.The suitable nutrient mass ratio and water depth for S.mcclurei are m(NaNO3):m(KH2PO3) =15:1 and 30 cm,respectively,while water depth above 60 cm inhibits its growth.