[大气CO浓度升高和温度对杨树和柳树幼苗土壤中挥发性卤代有机化合物含量的影响]
[Effect of elevated atmospheric CO concentration and temperature on volatile halogenated organic compound content in soils of and seedlings].
作者信息
Liu Gui-Zhen, Sun Hao-Zhao, Zhao Lin, Ma Fang-Yuan, Chen Lin-Yi, Huang Xing-Ran, Fang Xiong, Yi Zhi-Gang
机构信息
Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
出版信息
Ying Yong Sheng Tai Xue Bao. 2022 Mar;33(3):757-764. doi: 10.13287/j.1001-9332.202203.001.
Global changes caused by the increases of atmospheric CO 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, and seedlings in the southern subtropics were selected as the research objects. Four treatments, including control (CK), elevated CO 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 seedlings was 0.065-0.252 ng·g, which was higher than that of (0.038-0.136 ng·g). 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 seedlings decreased more than that of 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 seedlings, respectively, while BDCM and dibromomethane (DBM) were the main VOXs in the soil of 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 CO 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CO浓度升高和温度升高引起的全球变化对土壤生物地球化学过程具有重要影响。挥发性卤代有机化合物（VOXs）的合成与释放是土壤参与全球物质循环和能量流动的重要途径。本研究选取南亚热带地区的[具体树种1]和[具体树种2]幼苗作为研究对象。设置了4种处理，包括对照（CK）、CO浓度升高（EC）、温度升高（ET）以及二者同时升高（EC + ET）。采用开顶式气室系统结合吹扫捕集气相色谱/质谱联用技术，研究了EC和ET对土壤VOXs形成的影响。结果表明，[具体树种1]幼苗土壤中VOXs含量为0.065 - 0.252 ng·g，高于[具体树种2]（0.038 - 0.136 ng·g）。在EC、ET和EC + ET处理下，两个树种土壤中的VOXs含量均降低。ET的影响最为显著，两种土壤中的降低率分别为74.2%和72.1%。VOXs含量随温度升高的变化主要归因于土壤水分和氮含量的变化。在不同处理下，[具体树种1]幼苗土壤中VOXs含量的降低幅度大于[具体树种2]。在CK、EC、ET和EC + ET处理中，[具体树种1]幼苗土壤中主要的VOXs分别为溴二氯甲烷（BDCM）（27.5%、36.7%、32.9%、32.6%）和四氯化碳（TCM）（9.0%、16.8%、22.7%、15.8%），而[具体树种2]幼苗土壤中主要的VOXs为BDCM和二溴甲烷（DBM）。BDCM分别占各处理VOXs含量的31.9%、38.2%、40.9%和37.2%，DBM分别占VOXs含量的17.9%、16.5%、19.2%和16.0%。模拟大气CO浓度和温度升高有利于更全面地反映全球气候变化的生态效应，可为改进挥发性有机化合物通量模型提供数据支持。
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