Effects of Defoliation on Isoprene Emissions from Oaks

植物排放的异戊二烯是低层大气中最重要的一种自然存在的挥发性有机化合物，因为它是大气中一氧化碳、臭氧和甲烷浓度的主要控制物。了解是什么控制着植物的异戊二烯排放，对于改进用于研究全球气候变化的大气化学模型至关重要。该项目探索了一种新的、潜在的主要控制植物异戊二烯排放的方法。初步研究表明，栎树部分落叶导致残叶中异戊二烯排放量意外增加。在美国东部，橡树是主要的异戊二烯排放者，并且周期性地受到一种引进的森林害虫，舞毒蛾的大规模落叶。该项目将研究落叶对橡树异戊二烯排放的影响，利用这些信息改进预测植物异戊二烯排放的现有模型。

9652658 Jones Effects of Defoliation on Isoprene Emissions from Oaks Isoprene emitted by plants is the single most important naturally occurring volatile organic compound in the lower atmosphere, because it is a major control on atmospheric concentrations of carbon monoxide, ozone and methane. Understanding what controls isoprene emissions from plants is critical for improving models of atmospheric chemistry that are used in studying global climate change. This project explores a new, potentially major control over isoprene emissions from plants. Preliminary studies showed that partial defoliation of oaks resulted in an unexpected increase in isoprene emissions from remaining leaves. Oaks are the major isoprene-emitters in the eastern U.S., and are periodically subjected to massive, wide-scale defoliation by an introduced forest insect pest, the Gypsy Moth. This project will study the effects of defoliation on isoprene emissions from oaks, using the information to improve existing models that predict isoprene emissions from plants.