Observational studies on volatile organic compounds of the tropical forest in Xishuangbanna

China Environmental Science 白建辉 1 , Bradly Baker 2 , Curtis Johnson 2 ,李庆军 3 ,王永峰 3 ,赵崇奖 3 ,Lee Klinger 4 , Alex Guenther 4 , Jim Greenberg 4 (1.中国科学院大气物理研究所中层大气与全球环境探测开放实验室,北京 100029；2.South Dakota School of Mines and Technology, Rapid City 57701； 3.中国科学院西双版纳热带植物园,云南 昆明 650223； 4.National Center for Atmospheric Research, Boulder 80307) (PAR)、气温、湿度、风等参数进行了观测.结果表明,热带地区人工橡胶林区域湿季异戊二烯的排放有明显的日变化规律,中午前后为一天 中的最大值,异戊二烯排放通量的日平均值在 0.85~0.24mgC/(m 2 ⋅h)之间.对小时值和日平均值而言,异戊二烯的排放与 PAR 和气温的变化规 律比较一致,但它对 PAR 比对气温更加敏感.不同的天气状况对异戊二烯的排放有非常明显的影响.橡胶林是一个单萜烯排放者,其单萜烯 的排放速率明显依赖于 PAR.橡胶林和热带雨林冠层上空异戊二烯和单萜烯的浓度也有明显的日变化规律,而且橡胶林区域的异戊二烯和 中图分类号：X503.235 文献标识码：A Observational studies on volatile organic compounds of the tropical forest in Xishuangbanna. BAI Jian-hui 1 , Bradly Baker 2 , Curtis Johnson 2 , LI Qing-jun 3 , WANG Yong-feng 3 , ZHAO Chong-jiang 3 , Lee Klinger 4 , Alex Guenther 4 , Jim Greenberg 4 (1.Laboratory for Middle Atmosphere Layer and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China；2.South Dakota School of Mines and Technology, Rapid City 57701, USA； 3.Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China； 4.National Center for Atmospheric Research, Boulder 80307, USA). China Environmental Science, 2004,24(2)：142~146 Abstract：Continuous measurement of isoprene emission flux of tropical forest in Xishuangbanna, Yunnan utilizing isoprene flux measurement system was conducted in July 2002; meanwhile, investigation of parameters such as photosynthetically active radiation (PAR), air temperature, humidity and wind were conducted. The emission of isoprene in artificial rubber trees area in the wet season exhibited an obvious diurnal variation, with maximum value around noon, and daily averaged emission flux of 0.85~0.24mgC/(m 2 ⋅h). Hourly and daily average emission flux of isoprene were relatively in accordance with the variation rule of PAR and air temperature, but being more sensitive with PAR than with air temperature. The emission of isoprene was very obviously influenced by different weather conditions. Rubber trees were monoterpene emitters with emission rate dependence markedly on PAR. The concentrations of isoprene and monoterpenes on the corolla of rubber trees and tropical rain forest also exhibited an obvious diurnal variation rule, and the concentrations of isoprene and monoterpenes in the rubber trees area were obviously higher than in the tropical rain forest. Key words： isoprene； monoterpenes； emission flux； photosynthetically active radiation； rubber trees； tropical rain forest 其他挥发性有机物(VOC)的排放通量,确定控制 VOC 排放过程的主要因子,准确模拟植物 VOC * 责任作者, 副研究员, bjh@mail.iap.ac.cn