Abstract: Observations of VOCs concentration were conducted at a litchi plantation in the Pearl River Delta in July 2008 and February-March 2009 respectively. VOCs fluxes were estimated based on the relationship of flux-gradient and REA method using the VOCs concentration data. Statistical evidence indicates that the major emission matter is isoprene with a typical daytime mean flux 0.932 nmol/(m2?s) in the growing season over the litchi plantation. While in the non growing season, the flux is negligible. This study provides a reliable reference not only for emission rates for litchi and manmade plantation, but also for usage of micrometeorological methods to measure VOCs fluxes.

Key words: VOCs, litchi, plantation, turbulent flux, surface-layer flux-profile relationship, REA

摘要： 利用2008年7月和2009年2?3月在珠三角地区开展的挥发性有机化合物(VOCs)和微气象学综合实验观测资料, 分别应用近地面层通量廓线关系法和松弛涡旋累积法(REA)计算了荔枝林下垫面VOCs冠层尺度通量。结果表明: 荔枝林的主要生物挥发性有机化合物(BVOCs)排放为异戊二烯, 其排放有着明显的季节变化和日变化。荔枝林生长季白天的典型异戊二烯通量为0.932 nmol/(m2?s), 非生长季植物排放不显著。该结果为使用微气象学方法获取VOCs通量提供了借鉴。

关键词: 挥发性有机化合物, 荔枝, 人工林, 湍流通量, 近地面层通量廓线关系, 松弛涡旋累积法