Abstract
Methane (CH4) is an important greenhouse gas second only to CO2 in terms of its greenhouse effect. Vegetation plays an important role in controlling soil CH4 fluxes, but the spatial variability of soil CH4 fluxes during vegetation restoration in Loess Hilly Region (LHR) is not fully understood. The effects of different plant community types Medicago sativa grassland (MS); Xanthoceras sorbifolium forestland (XS); Caragana korshinskii bushland (CK); Hippophae rhamnoides shrubland (HR); and Stipa bungeana grassland (SB)] on soil CH4 flux in LHR were studied via the static chamber technique. The results showed that the five plant community types were sinks of soil CH4 in LHR, the plant community type significantly affected the soil CH4 flux, and the average CH4 uptake from high to low was in SB, HR, CK, MS, and XS. During the whole study period, the soil CH4 flux showed similar interannual variation. The maximum absorption of soil CH4 appeared in the growing season, while the minimum appeared in winter. Soil CH4 uptake was positively correlated with soil temperature and soil moisture. Soil temperature and moisture are important controlling factors for the temporal variability of soil CH4 flux. In LHR, the Stipa bungeana grassland is the more suitable plant community type for reducing soil CH4 emissions. In the process of vegetation restoration in LHR, the soil CH4 absorption potential of different plant community types should be considered, ecological benefits should be taken into account, and vegetation more suitable for mitigating the greenhouse effect should be selected.
摘要
甲烷(CH4)是一种温室效应仅次于二氧化碳的重要温室气体。植被在控制土壤CH4通量方面起着及其重要的作用,但在黄土丘陵区植被恢复过程中,土壤CH4通量的空间变异性还缺乏认识。本文通过静态箱技术,研究了不同植物群落类型[Medicago sativa草地(MS);Xanthoceras sorbifolium林地(XS);Caragana korshinskii灌丛(CK);Hippophae rhamnoides灌木林(HR);Stipa bungeana草地(SB)]对黄土丘陵区土壤CH4通量的影响。结果表明,五种植物群落类型都是黄土丘陵区土壤CH4的汇,植物群落类型对土壤CH4通量有明显影响,不同植物群落类型下CH4吸收量平均由高到低分别为SB、HR、CK、MS、XS。在整个研究期间,不同植物群落类型下土壤CH4通量呈现类似的年际变化。土壤CH4的最大吸收量出现在生长季节,而最小吸收量出现在冬季。土壤CH4吸收量与土壤温度和土壤湿度呈正相关。土壤温度和水分是土壤CH4通量的时间变化的重要控制因素。在黄土丘陵区,Stipa bungeana草地是比较适合减少土壤CH4排放的植物群落类型。在黄土丘陵区的植被恢复过程中,应考虑不同植物群落类型的土壤CH4吸收潜力,考虑生态效益,并选择更适合缓解温室效应的植被。
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Acknowledgements
We would like to thank all the people who were involved in the field and laboratory work. This study was financially supported by the Gansu Province Key Research and Development Program (Grant No. 20YF8NA135), the Gansu Province Financial Special Project (Grant No. GSCZZ 20160909), and the Industrial Support Program Project (Grant No. 2021CYZC-15, No.2022CYZC-41). The authors would like to thank Director Jin CHEN, Xiaoping WANG, and other staff from the Soil and Water Conservation Research Institute in Dingxi City, Gansu Province, for their support with the management of the experimental field, and Bin WU of the Ecological Research Center of Northeast Forestry University for his advice on the experimental data in this paper.
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Article Highlights
• The five plant community types studied are sinks of soil CH4 in LHR.
• Plant community type significantly affects soil CH4 flux, and the largest average soil CH4 uptake flux is in Stipa bungeana grassland.
• Max (min) soil CH4 uptake is in the growing season (winter); soil temperature and moisture control the temporal variation of soil CH4 flux.
• Stipa bungeana grassland is the ideal plant community type to reduce soil CH4 emissions in LHR.
This paper is a contribution to the special issue on Carbon Neutrality: Important Roles of Renewable Energies, Carbon Sinks, NETs, and non-CO2 GHGs.
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Yang, C., Li, G., Yan, L. et al. Effects of Plant Community Type on Soil Methane Flux in Semiarid Loess Hilly Region, Central Gansu Province, China. Adv. Atmos. Sci. 39, 1360–1374 (2022). https://doi.org/10.1007/s00376-022-1169-4
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DOI: https://doi.org/10.1007/s00376-022-1169-4