Soil Biogenic Volatile Organic Compound Flux in a Mixed Hardwood Forest: Net Uptake at Warmer Temperatures and the Importance of Mycorrhizal Associations
Soil Biogenic Volatile Organic Compound Flux in a Mixed Hardwood Forest: Net Uptake at Warmer Temperatures and the Importance of Mycorrhizal Associations
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DOI：
10.1029/2019jg005479
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
A. Trowbridge;P. Stoy;Richard P Phillips
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文献类型：
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作者：
A. Trowbridge;P. Stoy;Richard P Phillips
生物源挥发性有机化合物（bVOCs）在生态相互作用和地球系统过程中发挥着重要作用，但驱动土壤bVOC交换的生物和物理过程仍然知之甚少。在温带森林中，几乎所有的树种与丛枝菌根（AM）或外生菌根（ECM）真菌。考虑到AM为主和ECM为主的林分之间土壤生物地球化学的差异，我们假设bVOC与大气的交换在两种林分类型的土壤之间会有所不同。我们在美国印第安纳州中南部的落叶林中，在植物生长季节的早期和晚期，在以AM和ECM相关树木为主的地块中测量了土壤-大气界面的bVOC通量。在AM和ECM占主导地位的地块中，土壤在落叶后是净bVOC汇，并且在较高的土壤温度（Ts）下是更大的bVOC汇或更小的来源。ECM样地中不同bVOCs的排放通量除与Ts有关外，还与土壤含水量有关。甲醇占主导地位的总bVOC通量，ECM土壤表现出更大的吸收相对于AM为主的地块，在170 nmol m−2 hr−1的顺序在生长季节早期。我们的研究结果表明，在森林生态系统中的菌根协会bVOC动态特征的土壤动态的重要性，并强调需要研究双向土壤bVOC吸收和排放过程。
Biogenic volatile organic compounds (bVOCs) play important roles in ecological interactions and Earth system processes, yet the biological and physical processes that drive soil bVOC exchanges remain poorly understood. In temperate forests, nearly all tree species associate with arbuscular mycorrhizal (AM) or ectomycorrhizal (ECM) fungi. Given well‐established differences in soil biogeochemistry between AM‐dominated and ECM‐dominated stands, we hypothesized that bVOC exchanges with the atmosphere would differ between soils from the two stand types. We measured bVOC fluxes at the soil‐atmosphere interface in plots dominated by AM‐ and ECM‐associated trees in a deciduous forest in south‐central Indiana, USA during the early and late vegetative growing season. Soils in both AM‐ and ECM‐dominated plots were a net bVOC sink following leaf‐out and were a greater bVOC sink or smaller source at warmer soil temperatures (Ts). The flux of different bVOCs from ECM plots was often related to soil water content in addition to Ts. Methanol dominated total bVOC fluxes, and ECM soils demonstrated greater uptake relative to AM‐dominated plots, on the order of 170 nmol m−2 hr−1 during the early growing season. Our results demonstrate the importance of soil dynamics characterized by mycorrhizal associations to bVOC dynamics in forested ecosystems and emphasize the need to study bidirectional soil bVOC uptake and emission processes.