摘要
大叶藻海草场是重要生境但在我国严重退化,亟需研究有效的修复方法。本文以桑沟湾的大叶藻种子为研究对象,探讨了盐度急变（0~30）对种子萌发、萌发后继续发育和存活及幼苗幼叶的光合与呼吸速率的影响,为以种子繁殖修复大叶藻海草场提供参考。结果表明：盐度降低促进种子萌发,盐度15及以下效果显著,盐度0时萌发率最高;盐度0~15中萌发的种子均可发育成幼苗,发育和衰亡的比例和速率受萌发盐度背景和萌发后培养盐度的双重影响——较高萌发盐度有利于种子萌发后的发育和存活,种子萌发后于盐度5~30中均可建成幼苗并存活、但在盐度0或1中发育至不同程度后全部死亡。盐度5~30范围内,幼苗幼叶均有净产氧,光合和呼吸作用及净产氧率具随盐度升高而增强趋势。于盐度0或5中萌发、盐度5~30中进一步培育的变盐育苗策略,最高实现了24%或12%的种子于2个月内建成幼苗并继续发育,可作为种子繁殖法修复大叶藻海草场的技术参考。
Critical habitats of Zostera marina beds have greatly declined and request studies of effective method（s） for rehabilitation. Seeds of Z. marina were collected from Sanggou Bay, Dongchudao, Rongcheng, Shandong, Chi- na,and the effects of acute salinity variation （0--30） on the seed germination and seedling development were stud- ied in the laboratory,to provide information for the rehabilitation of seagrass bed with seed reproduction. The re- sults showed that lowering salinity induced the germination rate of Z. marina seeds, with significance occurred at salinities 15 and lower, and the highest germination rate at salinity 0. Seeds germinated at salinities 0,5 and 15 could develop into seedlings and survive, with the percentage and time period influenced by both germination salini- ty background and post-germination incubation salinity： （1） higher germination salinities promoted germinated seeds developing into seedlings and surviving better, （2） seedlings were established and continued growth and fur- ther development at post-germination incubation salinities 5--30, while 100% mortality occurred after various de- velopment at salinity 0 or 1. Seedling leaves presented net production of oxygen at salinities 5--30,with a trend of higher gross and net production of oxygen and higher respiration rates at higher salinities. The results indicated that Z. marina seeds could produce 24% or 12% of health seedlings within two months treatment of acute salinity variation,germinating at salinities 0 or 5 and developing at salinities 5--30, which presented a practical method of seagrass bed rehabilitation with Z. marina seeds.
出处
《海洋学报》
CAS
CSCD
北大核心
2016年第2期104-111,共8页
基金
国家自然科学基金委-山东省联合基金项目"海洋生态与环境科学"(U1406403)
关键词
大叶藻
海草
种子
萌发
幼苗
盐度
Zostera marina L.
seagrass
seed
germination
seedling
salinity
