Volatile halocarbon emissions by three tropical brown seaweeds under different irradiances
Volatile halocarbon emissions by three tropical brown seaweeds under different irradiances
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DOI：
10.1007/s10811-013-9990-x
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发表时间：
2013-10-01
影响因子：
3.3
通讯作者：
Sturges, William T.
中科院分区：
文献类型：
--
作者：
Keng, Fiona Seh-Lin;Phang, Siew-Moi;Sturges, William T.
测定了采自马来西亚西海岸拉查多角的三种热带褐藻在不同辐照度下8种挥发性卤代化合物的排放率。采用气相色谱仪和质量选择检测器组成的净化捕集制样系统，测定了马尾藻（Sargassum binderi Sonder ex J. Agardh）、南帕迪纳（Padina australis Hauck）和沙锥虫（Turbinaria conoides (J. Agardh) Kutzing）释放的一组卤代烃。所有种类均广泛分布于马来西亚半岛，其中S. binder是我们调查地点的优势种。发现很少卤代烃的释放受辐照度的影响。某些卤代化合物的排放与光合活性之间也存在相关性，特别是溴和碘化合物（0.6 < r < 0.9; p < 0.01），这表明光等环境因素可以影响海藻向大气中释放这些挥发性卤代化合物。与温带和极地褐藻相比，热带褐藻，如T. conoides，可能释放出更高水平的溴仿、CHBr3和其他卤代烃。因此，研究热带海藻对当地大气中卤化碳组成的贡献是重要的。
The emission rates of eight volatile halogenated compounds by three tropical brown seaweed species collected from Cape Rachado, west coast Peninsular Malaysia, under different irradiances have been determined. A purge-and-trap sample preparation system with a gas chromatograph and mass-selective detector was used to measure a suite of halocarbons released by Sargassum binderi Sonder ex J. Agardh, Padina australis Hauck, and Turbinaria conoides (J. Agardh) Kutzing. All species are widely distributed in Peninsular Malaysia, with S. binderi a dominant seaweed species at our survey site. Release of few halocarbons was found to be influenced by irradiance. Correlations were also observed between emission of certain halocarbons with photosynthetic activity, especially bromo-and iodinated compounds (0.6 < r < 0.9; p < 0.01) suggesting that environmental factors such as light can affect the release of these volatile halogenated compounds by the seaweeds into the atmosphere. Compared with temperate and polar brown seaweeds, tropical species, such as T. conoides, may emit higher levels of bromoform, CHBr3, and other halocarbons. It is therefore important to investigate the contribution of tropical seaweeds towards the local atmospheric composition of halocarbons.