Online analysis of volatile organic compound emissions from Sitka spruce (Picea sitchensis)
Online analysis of volatile organic compound emissions from Sitka spruce (Picea sitchensis)
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DOI：
10.1093/treephys/24.7.721
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发表时间：
2004-07-01
期刊：
影响因子：
4
通讯作者：
Hewitt, CN
中科院分区：
文献类型：
--
作者：
Hayward, S;Tani, A;Hewitt, CN
研究了锡特卡云杉（Picea sitchensis Bong.）生长在一系列受控的光和温度制度进行了在线监测与质子转移反应-质谱仪（PTR-MS）操作在时间分辨率为1分钟。异戊二烯排放量平均超过70%的测量挥发性有机化合物和高达3.5%的同化碳。异戊二烯的发射速率（E）与光合光子通量（PPF）和温度密切相关，在300至400 mumol m（-2）s（-1）之间的PPF处显示饱和，最大值在35至38摄氏度之间。在30 ℃和1000 μ mol m（-2）s（-1）PPF的标准条件下，平均异戊二烯E为13 μ g（dm）（-1）h（-1），比以前在该物种中观察到的高得多。在30 ℃时，乙醛、甲醇和单萜的平均E分别为0.37、0.78和2.97 mug g（dm）（-1）h（-1）。响应于突然的从亮到暗的转变，异戊二烯E在约3小时内指数下降> 98%;然而，在前7分钟期间，这种原本稳定的衰减暂时但立即被抑制到接近于黑暗前速率的40%，然后在随后的7分钟期间反弹以重新加入指数衰减的一般向下轨迹。异戊二烯E的突然急剧下降反映在乙醛E的爆发上。乙醛E最大值与异戊二烯E最小值（光照后7分钟）一致，异戊二烯排放量恢复其指数衰减时停止。对这些现象的原因和相互之间的联系进行了调查。
Volatile organic compound (VOC) emissions from Sitka spruce (Picea sitchensis Bong.) growing in a range of controlled light and temperature regimes were monitored online with a proton transfer reaction-mass spectrometer (PTR-MS) operating at a temporal resolution of similar to1 min. Isoprene emissions accounted for an average of more than 70% of measured VOCs and up to 3.5% of assimilated carbon. Emission rates (E) for isoprene correlated closely with photosynthetic photon flux (PPF) and temperature, showing saturation at a PPF of between 300 and 400 mumol m(-2) s(-1) and a maximum between 35 and 38degreesC. Under standard conditions of 30degreesC and 1000 mumol m(-2) s(-1) PPF, the mean isoprene E was 13 mug g(dm)(-1) h(-1), considerably higher than previously observed in this species. Mean E for acetaldehyde, methanol and monoterpenes at 30degreesC were 0.37,0.78 and 2.97 mug g(dm)(-1) h(-1), respectively. In response to a sudden light to dark transition, isoprene E decreased exponentially by > 98% over about 3 h; however, during the first 7 min, this otherwise steady decay was temporarily but immediately depressed to similar to40% of the pre-darkness rate, before rallying during the following 7 min to rejoin the general downward trajectory of the exponential decay. The sudden sharp fall in isoprene E was mirrored by a burst in acetaldehyde E. The acetaldehyde E maximum coincided with the isoprene E minimum (7 min post-illumination), and ceased when isoprene emissions resumed their exponential decay. The causes of, and linkages between, these phenomena were investigated.