樟树对14CO2的吸收和积累

为了探明14CO2在环境中的行为,采用同位素示踪技术研究了樟树对14CO2的吸收和积累动态,并探讨了樟树作为监测大气14CO2污染指示植物的可能性和优越性.结果表明,通过叶片光合作用从空气中吸收的14CO2会在樟树叶片中积累,检测到的14C比活度数值较大,表明空气中的14CO2易于通过叶片的光合作用而进入樟树叶片组织中;在污染前期14CO2主要被新叶组织中吸收,后期主要积累在老叶中,反映出新叶对空气14CO2污染比较敏感,而老叶积累效应明显.樟树叶片的这一特性可用于监测大气14CO2污染.

Uptake 14CO2 from air and accumulation of 14C in camphor

Uptake 14CO2 from air and accumulation of 14C in the camphor were studied by using the isotope-tracer techniques, which was used to get a better understanding of the environmental behavior of 14CO2. And the possibility and superiority of camphor used as the indicator plant in the supervisor of 14CO2 air pollution were discussed. The 14CO2, which was uptaken from the air by the leaf photosynthesis, would accumulate in the leaves of camphor. 14C specific activity was detected high, which demonstrated 14CO2 in the air easily got into leaf tissue of the camphor through photosynthesis. During the early stage of 14CO2 pollution, 14CO2 was mainly uptoken by young leaf tissues while was accumulated mostly in old leaves in later stage. It indicated that the young leaves were sensitive to air pollution of 14CO2 while old leaves had significant the effect of accumulation. Owing to its accumulation of 14CO2, camphor can be used as the indicator plant in the supervisor of 14CO2 air pollution.