生态因子对缘管浒苔氮、磷吸收速率的影响

Effects of Some Ecological Factors on the Absorption of N,P by Enteromorpha linza Ulva

采用光照、pH值、盐度和温度等生态因子对缘管浒苔N、P吸收速率的影响进行研究,试图探讨缘管浒苔用于优化虾塘养殖环境的可行性。结果表明:光照、pH值、盐度和温度等生态因子对缘管浒苔N、P吸收速率的影响显著。在0～1000lx光强范围内,缘管浒苔对DIN、DIP的吸收速率随光强的增加而增大,1000～5000lx光强范围内,其对DIN、DIP的吸收速率较大,平均为(0.00030±0.0012)μmol.g-1.h-1,(0.00156±0.0011)μmol.g-1.h-1,超过5000lx时,其对DIN、DIP的吸收速率显著下降;在7.0～9.0的pH范围内,缘管浒苔对DIP、DIN的吸收速率较大,平均为(0.00012±0.0012)μmol.g-1.h-1,(0.00168±0.00142)μmol.g-1.h-1,而在这个范围之外,其对DIP、DIN的吸收速率下降显著;在15～25的盐度范围内,缘管浒苔对DIP、DIN的吸收速率较大,其对DIP、DIN的吸收速率均在盐度为15时最大,分别为(0.00021±0.00005)μmol.g-1.h-1,(0.0055±0.0006)μmol.g-1.h-1;在20～35℃范围内,缘管浒苔对N、P的吸收速率较高,35℃时对P的吸收速率达到最大值(0.00056±0.0026)μmol.g-1.h-1,30℃时对N的吸收速率达到最大值(0.02456±0.00011)μmol.g-1.h-1,而在这个范围之外,其吸收速率明显下降。

To explore the feasibility of Enteromorpha linza ulva in optimizing shrimp culture environment,the effects of light,pH,salinity,temperature and other ecological factors on the absorption of N,P by Enteromorpha linza ulva were analyzed. The results indicated that N,P by Light,pH,salinity,temperature and other ecological factors affected the uptake rate N,P by Enteromorpha linza ulva significantly. Within 0—1 000 lx light intensity,the uptake rate of DIN,DIP by Enteromorpha linza ulva increased with the increase of light intensity; within 1 000—5 000 lx light intensity range,the uptake rate of DIN,DIP were higher,average was（0.000 30±0.001 2）μmol·g-1·h-1,（0.001 56±0.001 1）μmol·g-1·h-1; above than 5 000 lx,the uptake rate of DIN,DIP decreased significantly. Within pH 7.0—9.0,the uptake rate of DIN,DIP were higher,average was（0.000 12±0.001 2）μmol·g-1·h-1,（0.001 68±0.001 42）μmol·g-1·h-1,while outside this range,the uptake rate of DIN,DIP decreased significantly; Within the salinity range of 15—25,the uptake rate of DIN,DIP were higher,the highest vlue was observed when salinity in 15,the uptake rate of DIN,DIP were（0.000 21±0.000 05）μmol·g-1·h-1 and（0.005 5±0.000 6）mol·g-1·h-1. Within 20—35℃,the uptake rate of DIN,DIP were higher,the maximum absorption rate of P reached at 35℃,which was （0.000 56±0.002 6）μmol·g-1·h-1,the maximum absorption rate of N maximum reached at 30℃,which was （0.024 56±0.000 11）μmol·g-1·h-1,while outside the scope ,the absorption rate decreased significantly.