Grote Rüdiger, Lavoir Anne-Violette, Rambal Serge, Staudt Michael, Zimmer Ina, Schnitzler Jörg-Peter
Institut für Meteorologie und Klimaforschung Bereich Atmosphärische Umweltforschung Forschungszentrum Karlsruhe GmbH, Kreuzeckbahnstr 19, 82467 Garmisch-Partenkirchen, Germany.
Oecologia. 2009 May;160(2):213-23. doi: 10.1007/s00442-009-1298-9. Epub 2009 Feb 14.
In many ecosystems drought cycles are common during the growing season but their impact on volatile monoterpene emissions is unclear. Therefore, we aimed to develop and evaluate a process-based modelling approach to explore the explanatory power of likely mechanisms. The biochemically based isoprene and monoterpene emission model SIM-BIM2 has been modified and linked to a canopy model and a soil water balance model. Simulations are carried out for Quercus ilex forest sites and results are compared to measured soil water, photosynthesis, terpene-synthase activity, and monoterpene emission rates. Finally, the coupled model system is used to estimate the annual drought impact on photosynthesis and emission. The combined and adjusted vegetation model was able to simulate photosynthesis and monoterpene emission under dry and irrigated conditions with an R(2) of 0.74 and 0.52, respectively. We estimated an annual reduction of monoterpene emission of 67% for the extended and severe drought period in 2006 in the investigated Mediterranean ecosystem. It is concluded that process-based ecosystem models can provide a useful tool to investigate the involved mechanisms and to quantify the importance of specific environmental constraints.
在许多生态系统中，干旱周期在生长季节很常见，但其对挥发性单萜排放的影响尚不清楚。因此，我们旨在开发和评估一种基于过程的建模方法，以探索可能机制的解释力。基于生化的异戊二烯和单萜排放模型SIM-BIM2已被修改，并与冠层模型和土壤水平衡模型相链接。对冬青栎林地进行了模拟，并将结果与实测的土壤水分、光合作用、萜烯合酶活性和单萜排放率进行了比较。最后，利用耦合模型系统估算了干旱对光合作用和排放的年度影响。组合并调整后的植被模型能够在干旱和灌溉条件下模拟光合作用和单萜排放，其R(2)分别为0.74和0.52。我们估计，在被调查的地中海生态系统中，2006年长期严重干旱期间单萜排放每年减少67%。得出的结论是，基于过程的生态系统模型可以为研究相关机制和量化特定环境限制的重要性提供一个有用的工具。
