两种增温方式对杉木和木荷单萜烯通量及光合特性的影响
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1.福建农林大学资源与环境学院/土壤环境健康与调控福建省重点实验室;2.福建农林大学机电工程学院;3.福建农林大学

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国家自然科学基金(41877326)


Effects of two warming methods on monoterpene flux and photosynthetic parameters of Cunninghamia lanceolata and Schima superba
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Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation,College of Resources and Environment,Fujian Agriculture and Forest University

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    摘要:

    全球增温对森林生态系统碳循环产生了重要影响,而生物源挥发性有机化合物(Biogenic volatile organic compounds,BVOCs)是生态系统中生物合成的重要次生碳代谢产物。作为BVOCs的主要组成成分,单萜烯(Monoterpenes,MTs)合成与释放在森林生态系统碳循环过程中有重要作用。以南亚热带常见树种杉木(Cunninghamia Lanceolata(Lamb.)Hook)和木荷(Schima superba Gardn.et Champ)2年生盆栽苗木为对象,设置未增温、电热线增温、红外辐射器增温3个处理,分析不同增温方式对植物MTs通量、光合作用及相关酶活性的影响。结果表明:杉木MTs通量显著高于木荷,分别为4027.634—16239.608 pmol m-2 s-1、49.228—130.512 pmol m-2 s-1。电热线增温导致杉木MTs通量增加约2倍,以柠檬烯和γ-松油烯为主,分别占73.3%和15.1%;红外辐射器增温处理下杉木MTs通量下降52.6%,以柠檬烯和α-松油烯为主,分别占71.3%和18.9%。不同处理间杉木气孔导度的变化趋势与其MTs通量结果类似,增温可能主要通过影响植物气孔导度从而影响MTs释放。增温处理后木荷净光合速率增加,其中电热线增温处理效果更显著(9.890 μmol CO2 m-2 s-1),且不同处理存在显著性差异(P<0.05)。因此,在进行全球增温模拟研究时需考虑增温方式差异,建议尽量设置多种增温方式,以便更全面反映增温的生态效应,为全球增温模型提供更可靠的数据支撑。

    Abstract:

    Global warming plays an important impact on the carbon cycle of forest ecosystems, and biogenic volatile organic compounds (BVOCs) are important carbon-containing secondary metabolites biosynthesized in ecosystem. As the dominant components of BVOCs, the synthesis and release of monoterpenes (MTs) act as an important way to participate in the carbon cycle of forest ecosystems. In this study, Two-year-old potted seedlings of Cunninghamia Lanceolata (Lamb.) Hook and Schima superba Gardn.et Champ, the common tree species in lower subtropics, were selected as the research objects, and three treatments namely no heating (CK), heating wire heating (HW), and infrared radiator heating (IR) were set up. The effects of different heating methods on the emission rates of monoterpenes, photosynthetic parameters and related enzyme activities of C. Lanceolata and S. superba were analyzed. The results showed that the emission rates of monoterpenes in C. Lanceolata was significantly higher than those of S. superba, which were 4027.634—16239.608 pmol m-2 s-1 and 49.228—130.512 pmol m-2 s-1, respectively. The HW caused resulted in an approximately 2 fold increase in the emission rates of monoterpenes for C. Lanceolata, with limonene and γ-terpinene being the dominant component, which accounted for 73.3% and 15.1%, respectively. The emission rates of monoterpenes decreased by 52.6% under the IR treatment, with limonene and α-terpinene being the dominant components of monoterpenes accounted for 71.3% and 18.9%, respectively. The change trend of the stomatal conductance of C. Lanceolata among different treatments was similar to the results of the emission rates of monoterpenes, which could prove from the side that the increase in temperature might further affect the emission rates of monoterpenes by affecting stomatal conductance of plant. After heating treatment, the net photosynthetic rate of S. superba increased, and there was a significant increase for HW treatment (9.890 μmol CO2 m-2 s-1). It is worth noting that there were significant differences in the net photosynthetic rate of S. superba between the two heating methods (P<0.05). Therefore, when we conducted the impact of global warming on the carbon cycle of the ecosystem simulation studies, different heating methods should be taken into consideration,to further clarify whether the influence produced in the study is the influence of the heating method itself. It is necessary to set up multiple heating methods as much as possible for more fully understanding the ecological effects of global warming, which could provide more reliable data for establishment of the global warming model.

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马方园,郭豪,肖成玉,廖露露,周婉婷,方熊,易志刚.两种增温方式对杉木和木荷单萜烯通量及光合特性的影响.生态学报,,(). http://dx. doi. org/10.5846/stxb202105111230

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