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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Large Uptake of Atmospheric OCS Observed at a Moist Old Growth Forest: Controls and Implications for Carbon Cycle Applications
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Large Uptake of Atmospheric OCS Observed at a Moist Old Growth Forest: Controls and Implications for Carbon Cycle Applications

机译：在潮湿的旧生长森林观察到大型大气ocs：对碳循环应用的控制和影响

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摘要

Diurnal and vertical patterns of carbonyl sulfide (OCS) and CO_2 mixing ratios above and within a 60-m-tall old-growth temperate forest are presented. Canopy air from four different heights was sampled in situ using a continuous integrated cavity output spectroscopy analyzer during August-September 2014. Measurements revealed large vertical gradients in OCS, from which we inferred ecosystem fluxes. The diurnal cycle of OCS mixing ratios at all heights exhibited a typical pattern characterized by nighttime drawdown, an early morning minimum, and a maximum of OCS around midday. Daytime increase in the upper canopy is attributed to entrainment of planetary boundary layer air into the canopy. The ecosystem was found to be a large daytime sink of OCS (mean maximum daytime flux ~-75 pmol · m~(-2) · s~(-1)). Mean leaf relative uptake (concentration normalized uptake of OCS flux to CO_2 uptake) was found to be 6.9. We discuss this high leaf relative uptake in the context of the presence and distribution of epiphytes at the site. While epiphytic uptake of OCS has been studied before, we show for the first time that this may contribute significantly to ecosystem fluxes under humid or moist conditions. We test this theory using a chamber experiment measuring epiphytic fluxes for two species of lichen and one moss species (in situ and in a laboratory). We suggest that the role of epiphytes should be explicitly considered when using OCS as a tracer of ecosystem-scale photosynthesis in forest ecosystems with abundant epiphytic cover and biomass.
机译：硫化羰（OCS）和CO_2混合以上和60米高的老龄温带森林内比率的日和纵向模式呈现。从四个不同的高度篷空气原位使用连续集成腔输出光谱仪8 - 9月期间采样2014测量显示在OCS大的垂直梯度，从中我们推断生态系统通量。 OCS在所有高度混合比的昼夜周期表现出的特征在于夜间缩编，清晨最小值，在中午的最大OCS的典型图案。在上部顶盖白天增加归因于行星边界层空气的夹带进入篷。生态系统被发现是OCS的大的白天沉（平均最大磁通白天〜-75皮摩尔·米〜（-2）·S〜（-1））。平均数叶片相对吸收（浓度标准化摄取OCS通量CO_2摄取的）被发现是6.9。我们讨论了存在和附生植物的分布在现场的背景下，这个高叶相对摄取。虽然OCS的附生摄取之前已经研究中，我们展示的第一次，这可能在潮湿或潮湿条件显著有助于生态系统通量。我们用实验室测量附生通量的两个物种的地衣和苔藓一个物种（原位并在实验室）验证这一理论。我们认为，附生植物的作用应使用OCS作为生态系统的规模光合作用与丰富的附生盖和生物质能森林生态系统示踪剂时明确考虑。

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