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

Key words: 
• Enteromorpha linza ulva /
• light /
• pH /
• salinity /
• temperature /
• the uptake rate of N,P

Abstract: 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.