| 落叶阔叶林释放异戊二烯的研究 |
| 摘要点击 1036 全文点击 1760 修订日期：1993-08-31 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 异戊二烯 释放 落叶阔叶林 |
| 英文关键词 isoprene emission deciduous forest |
|
| 中文摘要 |
| 生物释放的烯烃是全球气候变化和温室效应研究的重要内容之一。本研究在国内首次测定了华北落叶阔叶林内10种乔、灌木的异戊二稀释放率,分别在0-1.28μg·g-1·h-1之间。探讨了林内异戊二烯的时空分布规律。发现高释放树种辽东栎的异戊二稀释放率呈昼夜周期性变化,在14:00达到1.92μg·g-1·h-1,夜晚几乎降为0.对各环境因子进行排序:光照与异戊二稀释放率的关系最为密切(r=0.8650).利用Bowen比法,估测落叶阔叶林内异成二烯释放通量约为4800μg·m-2·h-1.本研究采用GC-PID仪可直接分析未经处理的空气样。 |
| 英文摘要 |
| A measurment of isoprene emission from deciduous forest was finished in North China. Three groups were classified according to their isoprene emission rates. The high emission species,Liaodong Oak, was found to have an obvious variation from day to night. There were the maximum emission raters(1.92μg/g·h) at 14:00 and the minimum (-0) at 2:00.In several environmental factors, light has significant correlation (r=0.86) with the emission rates of Liaodong Oak. Factors could be ranked by the following order in terms of the degrees of their impacts on plant emission:light > leaf temperature > ambient temperature > humidity. In deciduous broad leaf forest, the concentration of isoprene varied from 13.6×10-6 to 26.7×10-6 with time and height. By the energy balance ratio method,the flux of isoprene above canopy was about 4800 g/(m2·h) in the morning. This research collected a new gas analysis system. Using GC-PID gas chase chromatograph, the untreated air samples could be measured directly. |
|
|
|
