【摘要】 于1985年4月—1986年3月对细基江蓠繁枝变型在广西池塘中的生长率作周年连续测定，研究几种主要环境因子对其生长的影响。结果表明，1．在广西地区池塘水温的年变化范围在15—32℃，藻体能周年生长；水温在20—30℃时生长较快；全年平均日生长率为2．4％。2．对生长率和光合作用速率的适宜盐度范围为14—27，以21左右为最好。3．无机氮营养盐的浓度在4μmol／L左右，即可维持较快的生长率。4．栽培深度以30cm左右为宜；栽培密度保持在500—1000g／m范围内较为合适。认为池塘引进淡水，降低盐度，提高氮含量是保证栽培成功的重要条件。更多还原

【Abstract】 The effect of temperature, salinity, culture density and depth, and total nitrogen content of the ambient seawater on the growth of Gracilaria tenuistipitata var.liui were concurrently studied in outdoor ponds (1-1.5m deep) in Guangxi Province,South China, and in laboratory in Qingdao from April 1985 through March 1986. The results showed that the mean annual growth rate was 2.4% per day, daily growth rate may reach as high as 3.3% at favourable temperature of 20-30℃.Salinity is an sepecially important factor influencing the growth and photosynthesis of this alga. Growth peaked at 21, with a broad plateau between 14-27. Maximum photosynthetic rate was obtained at 21 and was not markedly affected when the salinity was reduced to 14 and increased to 27. The above data indicate that 21 is the favourable salinity for growth and that this species is euryhaline and grows well in estuaries where the salinity is low and nitrogen content is high. Growth experiments showed that a total nitrogen (NH4-N plus NO3-N) concentration of 4μ mol/L was sufficient for the plants to maintain a daily growth rate of 2.7%. Culture depth experiments showed that growth and photosynthetic rates increased significantly with decreasing cultivation depth up to 30 cm. Culture density experiments indicated that growth rate decreased as the density increased to more than 1 000g/m2 but the increment per unit area was still high, because of the high biomass. It is, therefore, suggested that a density of 500-1 000g/m2 should be suitable for this kind of pond culture.更多还原