营养盐对浒苔生长影响的围隔生态实验

Mesocosm Experiments of Nutrient Effects on Enteromorpha prolifera Growth

2008年6月在青岛近海围隔实验研究了营养盐对浒苔生长的影响。结果表明,添加营养盐的围隔浒苔湿重生物量明显高于未添加营养盐的对照组和海区实验组。一次性添加f/2配方的营养盐和一次性添加N的2组浒苔日均相对增长率分别达10%和9%,围隔外海区对照只达4%。浒苔可在短期内快速大量地吸收营养盐,一次性添加f/2配方的营养盐储备液(水体浓度约f/8)的围隔中,浒苔24 h内对N和P的吸收速率分别为9.25μmol.g-1.h-1、0.63μmol.g-1.h-1。丰富的营养盐能够促进浒苔的迅速生长,营养盐的种类和浓度对浒苔的生长影响显著,种类多、浓度高的营养盐环境有利于浒苔生长。相对于NH4-N和PO4-P,充足的N源是浒苔快速生长的重要影响因素。

Nutrient effects on Enteromorpha prolifera growth are studied in mesocosm experiments in the coastal sea area of Qingdao in June 2008.It is shown in the results from the mesocosm experiment that the wet weight biomass of Enteromorpha prolifera group supplied with nutrients becomes evidently higher than that of either the group supplied without any nutrients or the group directly sampled from the studied sea area.The daily average growth rate of the group supplied only once with a f/2 nutrient dose is 10%,that with N is 9%,and the daily average growth rate of the group directly sampled from the studied sea area is only 4%.Enteromorpha prolifera（E.prolifera for short） can rapidly absorb a large quantity of nutrients in a short time.The experimental group supplied only once with the f/2 dose（diluted from the stored solution with the f/8 concentration） can absorb 9.25 μmol·g^-1·h^-1 of N,and 0.63 μmol·g^-1·h^-1 of P in the 24 h after the nutrient solution has been added.Richer nutrients can make E.prolifera grow more rapidly.E.prolifera growth obviously depends upon nutrient type and concentration.The surroundings with multiple and rich nutrients is helpful for the E.prolifera growth.It is learnt from the comparison between NH4-N and PO4-P that the N supply is a more important role for E.prolifera growth.