金鱼藻对14CO2的吸收和积累动态

为了探明14CO2(14C)在环境中的行为,采用同位素示踪技术研究了金鱼藻对14CO2的吸收和积累动态,并探讨了金鱼藻作为监测大气14CO2污染指示植物的可能性.结果表明,生长在水中的金鱼藻会通过某些途径吸收空气中14CO2并形成积累趋势,吸收途径主要是金鱼藻通过光合作用从水体中吸收游离14CO2和H14CO3-.金鱼...

Uptake14CO2 from Air and Accumulation of 14C in Hornwort

Uptake¹⁴CO₂ from air and accumulation of ¹⁴C in the hornwort were studied by using the isotope-tracer techniques in order to get a better understanding of the environmental behavior of ¹⁴CO₂. And the possibility of hornwort used as the indicator plant in the supervisor of ¹⁴CO₂ air pollution was discussed. The results show that the hornwort could uptake ¹⁴CO₂ from the air by some way and formed an accumulating trend. The main way was that the hornwort absorbed free ¹⁴CO₂ and H ¹⁴CO^-₃ from the water through photosynthesis. During the introducing ¹⁴CO₂, the increasing rate of ¹⁴C specific activity in dry hornwort and fresh hornwort were between 91.9-95.6 Bq/(g·d) and 6.1-6.3 Bq/(g·d), respectively, which was roughly equal to the increasing rate in the wheat. The results indicate that the hornwort had strong ability of absorbing ¹⁴CO₂ indirectly through water. The hornwort has an certain concentration of ¹⁴CO₂. And the concentration factor(CF) values rise with the introduction of ¹⁴CO₂and decline slowly after it reached the maximum value. Owing to its accumulation of ¹⁴CO₂,hornwort can be used as the indicator plant in the supervisor of ¹⁴CO₂ air pollution.