Isoprene emission characteristics of Quercus serrata in a deciduous broad-leaved forest
Isoprene emission characteristics of Quercus serrata in a deciduous broad-leaved forest
复制标题
DOI：
10.2480/agrmet.64.49
复制
发表时间：
2008
影响因子：
1.3
通讯作者：
M. Okumura;A. Tani;Y. Kominami;S. Takanashi;Y. Kosugi;T. Miyama;S. Tohno
中科院分区：
文献类型：
--
作者：
M. Okumura;A. Tani;Y. Kominami;S. Takanashi;Y. Kosugi;T. Miyama;S. Tohno
我们进行了实地测量异戊二烯排放量的阳光照射和遮荫叶片的锯齿栎，这是在日本的主要树种之一。测量是在山城通量塔网站在落叶阔叶林。在2006年6月，异戊二烯排放率（I），连同净同化率（A）和光合光子通量密度（PPFD），使用叶比色皿测量。实验结果表明，光照和遮荫叶片的I在中午前后达到峰值，而光照叶片的A在上午达到峰值，随后逐渐下降。因此，异戊二烯排放的碳与光合作用固定的碳的比率（碳比率）在下午增加。在PPFD值高于1000 µmol m-2 s-1时获得的数据集显示，这与叶温高度相关。用Guenther算法（G93）计算的Q在光照和遮荫条件下的基础辐射速率IS的平均值分别为42.9和20.5 nmol m ~（-2）s ~（-1）。锯齿状。结果表明，Q.锯齿树应被归类为强异戊二烯排放者。G93模型估算的I值与实测I值在4 nmol m-2 s-1的均方根误差范围内一致，表明G93模型可用于确定Q. Serrata对PPFD和叶温的影响。
We conducted field measurements of isoprene emissions from sunlit and shaded leaves of Quercus serrata, which is one of the major tree species in Japan. The measurements were conducted at the Yamashiro Flux Tower site in a deciduous broad-leaved forest. In June 2006, the isoprene emission rate (I), together with the net assimilation rate (A) and photosynthetic photon flux density (PPFD), was measured using a leaf cuvette. The experimental results demonstrated that I peaked at around noon for both the sunlit and shaded leaves, while A of the sunlit leaves peaked in the morning with a subsequent gradual decline. Consequently, the ratio of carbon emitted as isoprene to carbon fixed by photosynthesis (carbon ratio) increased during the afternoon. Data sets obtained at PPFD values higher than 1000 µmol m-2 s-1 revealed that highly correlated with the leaf temperature. The averages of the basal emission rate IS, calculated using the Guenther algorithm (G93), were 42.9 and 20.5 nmol m-2 s-1, respectively, for the sunlit and shaded leaves of Q. serrata. Our result indicates that Q. serrata should be categorized as a strong isoprene emitter. The measured I value estimated by the G93 model was consistent with the I value within a root-mean-square (RMS) error of 4 nmol m-2 s-1, suggesting that the G93 model can be used to determine the isoprene emission response of Q. serrata to PPFD and the leaf temperature.