| 金鱼藻对14CO2的吸收和积累动态 |
| 摘要点击 2761 全文点击 2041 投稿时间：2010-02-26 修订日期：2010-07-02 |
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| 中文关键词 金鱼藻 14CO2 吸收 积累 指示作物 |
| 英文关键词 hornwort 14CO2 uptake accumulation indicator plant |
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| 中文摘要 |
| 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H14CO-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. |
| 英文摘要 |
| 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. |
