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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Field studies of isoprene emissions from vegetation in the Northwest Mediterranean region
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Field studies of isoprene emissions from vegetation in the Northwest Mediterranean region

机译：地中海西北地区植被异戊二烯排放的现场研究

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During the Biogenic Emissions in the Mediterranean Area (BEMA) project field campaigns (1993 - 1997), 40 native Mediterranean plant species were screened for emissions of isoprene and monoterpenes using a branch enclosure sampling method with subsequent gas chromatographic-flame ionization detector (GC-FID) and GC-mass selective detector (MS) analysis. Thirteen species emitted more than 0.5 mu g (C) g(-1) dw h(-1) isoprene at 30 degrees C and 1000 mu mol m(-2) s(-1) photosynthetically active radiation (PAR), of which nine species emitted more than 20 mu g (C) g(-1) dw h(-1). Emissions of isoprene were strongly correlated with temperature and PAR, and were reasonably well predicted by existing algorithms. There was little intraspecies and day to day variation in base emission rates. In general, median base emission rates were higher in summer compared to autumn for most species. Significant difference in aggregated habitat base emission rates was found between dunes, garrigue, woodland, and riverside sample sites. Although considerable unexplained variability in base emission rates remains to be explored, first estimates of base emission rates for Mediterranean shrublands are presented here. [References: 32]
机译：在地中海地区的生物排放（BEMA）项目野外活动期间（1993年至1997年），采用分支封闭采样法以及随后的气相色谱-火焰离子化检测器（GC-）对40种地中海本地植物的异戊二烯和单萜的排放进行了筛选。 FID）和GC质量选择性检测器（MS）分析。 13种物质在30摄氏度和1000摩尔mol m（-2）s（-1）的光合有效辐射（PAR）下发出超过0.5μg（C）g（-1）dw h（-1）异戊二烯9个物种的排放量超过20克（C）g（-1）dw h（-1）。异戊二烯的排放与温度和PAR密切相关，并且可以通过现有算法合理地预测。种内种和基本排放率几乎没有每天变化。一般而言，大多数物种的夏季中位数基准排放率高于秋季。在沙丘，驻军，林地和河边采样点之间发现了生境总基准排放率的显着差异。尽管基本排放速率的巨大无法解释的变化仍有待探索，但这里还是对地中海灌丛的基本排放速率进行了初步估算。 [参考：32]

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