摘要
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H 14CO 3-.金鱼藻(干样)14C比活度的增长速率介于91.9～95.6 Bq/(g.d)范围内,鲜样介于6.1～6.3 Bq/(g.d)范围内,与小麦的增长速率基本相当,表明金鱼藻通过水体间接吸收利用空气中14CO2的能力较强.金鱼藻对14CO2具有一定的富集作用,富集系数随14CO2引入而上升,达到峰值后呈缓慢下降,积累效应明显.金鱼藻对空气中14CO2的富集特性使其可用来作为监测大气14CO2污染的指示作物.
Uptake ^14CO2 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 14 CO2.And the possibility of hornwort used as the indicator plant in the supervisor of 14 CO2 air pollution was discussed.The results show that the hornwort could uptake ^14 CO2 from the air by some way and formed an accumulating trend.The main way was that the hornwort absorbed free ^14 CO2 and H ^14CO 3-from the water through photosynthesis.During the introducing ^14CO2,the increasing rate of ^14 C 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 ^14 CO2.And the concentration factor（CF） values rise with the introduction of 14 CO2 and decline slowly after it reached the maximum value.Owing to its accumulation of 14 CO2,hornwort can be used as the indicator plant in the supervisor of ^14CO2 air pollution.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2011年第2期479-482,共4页
Environmental Science
基金
国家自然科学基金项目(20477040)
浙江省自然科学基金项目(Y505076)
