菹草生产力的研究

STUDIES ON PRODUCTIVITY OF POTAMOGETON CRLSPUS L

本文报道了水温、光照度、水的pH值和植株密度对菹草生产力影响的实验结果,以及植株不同部位上的生产力和叶绿素含量的测定值。在光照度8000lx和水温20—28℃的条件下,经51次测定,菹草顶枝的毛产量(P_G)在0.80—1.06毫克氧·小时/0.5克鲜重植物范围,平均值为0.92毫克氧·小时/0.5克;净产量(P_N)在0.44—0.79毫克氧·小时/0.5克范围,平均值为0.61毫克氧·小时/0.5克。1小时的平均净光合率为1.11％,1小时的平均呼吸率为0.53％。

Experimental results in relation to the effects of water temperature, light intensity, pH and population density on productivity of Potamogeton crispus, with the estimations of the productivity and the chlorophyll content in different parts of this species are reported here in. Under light intensity of 8000 lx and water temperature of 22—28℃, the gross production of the apical portion of Potamogeton crispus varies from 0.08 to 1.06 mgO_2·h/0.5 g fresh weight, with an average of 0.92 mgO_2·h/0.5 g; net production ranges 0.44—0.79 mgO_2·h/0.5 g, 0.61 mgO_2·h/0.5 g in average. The mean photosynthetic rate is 1.11% and the mean respiration rate is 0.53% per hour.