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  • Title: [Effect of elevated atmospheric CO2 concentration and temperature on volatile halogenated organic compound content in soils of Schima superba and Cunninghamia lanceolata seedlings].
    Author: Liu GZ, Sun HZ, Zhao L, Ma FY, Chen LY, Huang XR, Fang X, Yi ZG.
    Journal: Ying Yong Sheng Tai Xue Bao; 2022 Mar; 33(3):757-764. PubMed ID: 35524529.
    Abstract:
    Global changes caused by the increases of atmospheric CO2 concentration and temperature have important effects on soil biogeochemical processes. The synthesis and release of volatile halogenated organic compounds (VOXs) is an important pathway for soil to participate in the global material cycle and energy flow. In this study, Schima superba and Cunninghamia lanceolata seedlings in the southern subtropics were selected as the research objects. Four treatments, including control (CK), elevated CO2 concentration (EC), elevated temperature (ET) and elevated both factors (EC+ET) were set up. The effects of EC and ET on soil VOXs formation were studied by an open-top chamber system coupled with a purging and trapping gas chromatography/mass spectrometry. The results showed that VOXs content in the soil of S. superba seedlings was 0.065-0.252 ng·g-1, which was higher than that of C. lanceolata (0.038-0.136 ng·g-1). At the EC, ET and EC+ET treatments, VOXs contents were reduced in soils of both species. The effect of ET was the most significant, with the decrease rates of 74.2% and 72.1% in both soils, respectively. The change of VOXs content with increasing temperature mainly attributed to the changes of soil moisture and nitrogen content. The content of VOXs in the soils of S. superba seedlings decreased more than that of C. lanceolata under different treatments. In CK, EC, ET and EC+ET treatment, bromodichloromethane (BDCM) (27.5%, 36.7%, 32.9%, 32.6%) and tetrachloromethane (TCM) (9.0%, 16.8%, 22.7%, 15.8%) were the main VOXs in the soil of S. superba seedlings, respectively, while BDCM and dibromomethane (DBM) were the main VOXs in the soil of C. lanceolata seedlings. BDCM accounted for 31.9%, 38.2%, 40.9% and 37.2% of the VOXs content in each treatment, and DBM accounted for 17.9%, 16.5%, 19.2% and 16.0% of the VOXs content, respectively. Simulating elevated atmospheric CO2 concentration and temperature was conducive to more comprehensive reflection of the ecological effect of global climate change, and it could provide data support for improving the VOCs flux model. 大气CO2浓度增加和温度升高引起的全球变化对土壤生态系统的生物地球化学过程产生了重要影响。挥发性卤代烃(VOXs)的合成与释放是土壤参与全球物质循环与能量流动的重要途径。本研究以南亚热带乔木幼苗木荷和杉木为对象,设置对照(CK)、CO2浓度升高(EC)、增温(ET)以及两者同时升高(EC+ET)4个处理,运用开顶箱及吹扫捕集-气质联用仪分析大气CO2浓度增加和温度升高对土壤VOXs的影响。结果表明: 木荷幼苗土壤VOXs含量高于杉木,分别为0.065～0.252和0.038～0.136 ng·g-1。EC、ET和EC+ET处理均导致木荷和杉木幼苗土壤VOXs含量降低,其中,ET处理效果最明显,下降率分别达到74.2%和72.1%,增温主要通过改变土壤水分和氮含量而影响土壤VOXs含量。不同处理木荷幼苗土壤VOXs含量下降幅度大于杉木。CK、EC、ET和EC+ET处理木荷幼苗土壤VOXs以溴二氯甲烷和四氯化碳为主,溴二氯甲烷分别占27.5%、36.7%、32.9%、32.6%,四氯化碳分别占9.0%、16.8%、22.7%、15.8%;而杉木幼苗土壤VOXs以溴二氯甲烷和二溴甲烷为主,其中,溴二氯甲烷分别占31.9%、38.2%、40.9%和37.2%,二溴甲烷含量分别占17.9%、16.5%、19.2%和16.0%。模拟大气CO2浓度增加和温度升高复合因子的研究,有利于更全面反映全球气候变化的生态效应,可为完善挥发性有机化合物(VOCs)通量模型提供数据支持。.
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