围隔实验中浒苔在不同营养盐条件下的生长比较

Compare the Growth of Enteromorpha prolifera Under Different Nutrient Conditions

近年来浒苔在我国黄海海区大规模暴发,给沿海海区造成了严重的环境问题.为了探究营养盐对浒苔生长的影响,2012年5月在黄海海区进行了现场船基围隔实验.实验共设置12个围隔装置,9种不同的营养盐条件.实验发现,浒苔对营养盐有极强的吸收能力,生长能力很强,在营养盐适中时,相对生长率最高可达82%,即使在低营养盐条件下也会保持10%左右的生长速率.在磷酸盐含量适中时,高浓度的硝酸盐更能促进浒苔的生长;充足、连续的营养盐补充是浒苔绿潮暴发的物质基础.通过浒苔吸收的营养盐含量估算其光合作用产生有机物的质量,发现与浒苔湿重增加量有着良好的线性关系.

Enteromorpha prolifera（E.prolifera） tides have erupted frequently in the Yellow Sea and brought serious environmental problems to coastal sea since 2007.In order to research the influence of nutrients on E.prolifera growth,mesocosm experiments were carried out in the Yellow Sea in May 2012.There were 12 mesocosms,including 9 different experimental conditions.It shows that the uptake ability of nutrients and the growth of E.prolifera are strong.The growth rate of E.prolifera reaches 82% when the nutrient level is appropriate,while the rate could also keep around 10% even under low nutrient conditions.When phosphate level is appropriate,high dissolved inorganic nitrogen（DIN） concentration could promote the growth of E.prolifera.Sufficient and continuous nutrient supplement is the material basis for outbreak of E.prolifera green tide.Through analyzing the amount of nutrient uptake by E.prolifera,the production of organics by photosynthesis could be estimated,which has a strong linear relationship with the increased of wet weight of E.prolifera.