Isoprene emission capacity for US tree species
Isoprene emission capacity for US tree species
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DOI：
10.1016/s1352-2310(00)00407-6
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发表时间：
2001-07-01
影响因子：
5
通讯作者：
Guenther, A
中科院分区：
文献类型：
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作者：
Geron, C;Harley, P;Guenther, A
异戊二烯排放能力测量数据来自 18 种北美橡树 (Quercus) 物种和之前发现排放大量异戊二烯的其他 6 个属的物种。采样是在北卡罗来纳州、加利福尼亚州中部和俄勒冈州北部的不同地理地点进行的。使用环境控制的比色皿系统和带有还原气体检测器的气相色谱法，在标准条件或接近标准条件（叶温 30°C，光合有效辐射 1000 μ mol m(-2) s(-1)）下测量每个物种的几个太阳叶的排放。物种平均排放能力范围为39至158 mug C g(-1) h(-1)（86的平均值），或22至79 nmol m(-2) s(-1)（44的平均值）。这些比率比之前报道的同一物种的比率高 2-28 倍，最近的一项研究对此进行了总结，其中异戊二烯排放率是根据已发表的数据和分类学确定的。这些差异归因于发育过程中叶子环境的差异、测量技术（树枝或植物围栏与叶子围栏）以及缺乏与一些早期树枝围栏测量相关的环境测量。 18 种橡树中 15 种的基于质量的排放能力。枫香 (Liquidambar styraciflua) 和杨树 (Populus trichocarpa 和 P. deltoides) 均在当前生物挥发性有机化合物 (BVOC) 排放模型使用的范围内，而测量了其余三种橡树树种（Nyssa sylvatica、Platanus occidentalis）的排放率。刺槐、黑柳和杨杂种（毛果杨 x P. deltoides）的含量要高得多。此外，橡树种的平均比叶质量比当前排放模型中假设的高出 30%。这里报告的排放率和其他最近的研究支持最近的结论，即在炎热的夏季条件下，高排放物种的太阳叶的异戊二烯排放能力可以更好地用 100 +/- 50 mug C g(-1) h(-1) 的值来表示。我们还发现，先前建议的某些树种的中间异戊二烯排放率可能并不代表其真实的排放能力，并且阔叶植物物种在成熟叶子暴露于高环境温度和光环境时可能具有低（< 1.0 mug C g(-1) h(-1)）或非常高（类似于 100 mug C g(-1) h(-1)）遗传能力来排放异戊二烯。由爱思唯尔科学有限公司出版
Isoprene emission capacity measurements are presented from 18 North American oak (Quercus) species and species from six other genera previously found to emit significant quantities of isoprene. Sampling was conducted at physiographically diverse locations in North Carolina, Central California, and Northern Oregon. Emissions from several sun leaves of each species were measured at or near standard conditions (leaf temperature of 30 degreesC and photosynthetically active radiation of 1000 mu mol m(-2) s(-1)) using environmentally controlled cuvette systems and gas chromatography with reduction gas detectors. Species mean emission capacity ranged from 39 to 158 mug C g(-1) h(-1) (mean of 86), or 22 to 79 nmol m(-2) s(-1) (mean of 44). These rates are 2-28 times higher than those previously reported from the same species, which were summarized in a recent study where isoprene emission rates were assigned based on published data and taxonomy. These discrepancies were attributed to differences in leaf environment during development, measurement technique (branch or plant enclosure versus leaf enclosure), and lack of environmental measurements associated with some of the earlier branch enclosure measurements. Mass-based emission capacities for 15 of 18 oak species. sweetgum (Liquidambar styraciflua), and poplars (Populus trichocarpa and P. deltoides) were within ranges used in current biogenic volatile organic compound (BVOC) emission models, while measured rates for the remaining three oak species, Nyssa sylvatica, Platanus occidentalis. Robinia pseudoacacia, Salix nigra, and Populus hybrids (Populus trichocarpa x P. deltoides) were considerably higher. In addition, mean specific leaf mass of the oak species was 30% higher than assumed in current emission models. Emission rates reported here and in other recent studies support recent conclusions that isoprene emission capacities for sun leaves of high emitting species may be better represented by a value of 100 +/- 50 mug C g(-1) h(-1) during hot summer conditions. We also find that intermediate isoprene emission rates previously suggested for some tree species may not represent their true emission capacities, and that broadleaf plant species may have either low (< 1.0 mug C g(-1) h(-1)) or very high (similar to 100 mug C g(-1) h(-1)) genetic capacity to emit isoprene when mature foliage is exposed to a high ambient temperature and light environment. Published by Elsevier Science Ltd.