Effect of environmental factors on N and P uptake by Gracilaria tenuistipitata varliui Zhang et Xia

Abstract

Abstract: The effect of light intensity, pH, temperature, salinity on the uptake of nitrogen and phosphorus by Gracilaria tenuistipitata var.liui Zhang et Xia was were studied under laboratory conditions. The uptake rate of nitrogen reached as high as 0.32～0.36μmol·g^-1 ·h^-1 at favorable light intensity of 800～2400μmol photon·m^-2 ·s^-1, while that of phosphorus reached 0.017～0.018μmol·g^-1 ·h^-1 at 320～1600μmol photon·m^-2 ·s^-1. The nutrient uptake rate reached the maximum at pH 8.0. A significant difference of N uptake rate at different temperatures or salinities and that of P uptake rate at different temperatures were found.The N uptake rate was higher at 21～26℃ and 20%～28%, but P uptake was higher at 21～26℃. There was no interaction between temperature and salinity.

Key words: Gracilaria tenuistipitata var.liui Zhang et Xia, Nitrogen, Phosphorus, Uptake rate

CLC Number:

Q958.8

XU Zhongneng, LIN Xiaotao, JI Xinli, WANG Zhaohui, HUANG Changjiang . Effect of environmental factors on N and P uptake by Gracilaria tenuistipitata varliui Zhang et Xia[J]. Chinese Journal of Applied Ecology, 2001, (3): 417-421.

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