Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in Mollisols
[Objective] The effects of climate change on the stability of organic carbon were revealed from the perspective of the molecular structure of organic carbon in order to provide a theoretical basis for clarifying the impact of future climate change on organic carbon stability and soil fertility in mo...
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Science Press
2023-06-01
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| Series: | Shuitu baochi tongbao |
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| Online Access: | http://stbctb.alljournal.com.cn/stbctben/article/abstract/20230341 |
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| author | Xue Haiqing Yue Ya Feng Qian Long Jieqi Miao Huan Miao Shujie Qiao Yunfa |
| author_facet | Xue Haiqing Yue Ya Feng Qian Long Jieqi Miao Huan Miao Shujie Qiao Yunfa |
| author_sort | Xue Haiqing |
| collection | DOAJ |
| description | [Objective] The effects of climate change on the stability of organic carbon were revealed from the perspective of the molecular structure of organic carbon in order to provide a theoretical basis for clarifying the impact of future climate change on organic carbon stability and soil fertility in mollisols. [Methods] A long-term field experiment dealing with the simulation of climate change through the use of open-top chambers (OTCs) at the Hailun Agroecological Experiment Station of the Chinese Academy of Sciences provided data for this study. We analyzed the organic carbon content and infrared spectral characteristics of various aggregates and density fractions in the 0—20 cm topsoil of black soil under three treatments: ① ambient temperature and CO2 concentration (aTaCO2); ② temperature elevated by 2 ℃ and ambient CO2 concentration (eTaCO2); ③ temperature elevated by 2 ℃ and CO2 enrichment to (700±25) μmol/mol (eTeCO2). [Results] Neither eTaCO2 nor eTeCO2 significantly affected organic carbon content of the bulk soil compared with aTaCO2 (p>0.05). However, eTaCO2 increased soil organic carbon (SOC) contents by 13.45% and 52.89% in the <0.053 mm size aggregates and occluded light fraction (OF), respectively, (p<0.05). eTeCO2 increased SOC content by 46.89% in the free light fraction (LF) (p<0.05). Compared with aTaCO2, both eTaCO2 and eTeCO2 treatments significantly influenced the SOC molecular structure of the bulk soil. The relative intensity of other functional groups was significantly affected, except for the aliphatic group (p<0.05). Moreover, eTeCO2 weakened the aliphatic group of organic carbon in the bulk soil and the >0.25 mm size aggregate, but increased the -CH/C=C ratio of organic carbon in the 0.25—0.053 mm size aggregates (p<0.05). Alcohols, aliphatic, aromatic, and polysaccharides were the major functional groups affected by climate change. Furthermore, compared with aTaCO2, eTaCO2 and eTeCO2 increased the -CH/C=C ratio in the LF and OF fractions, accelerating lipolysis in light fractions of organic carbon. [Conclusion] Climate change had no effect on the content of organic carbon in mollisols. Although increased temperature and CO2 had different effects on the composition and proportion of organic carbon molecular structure, organic carbon storage remained stable in mollisols. Climate change may have little effect on soil organic carbon storage, and the fertility level of the black soil can still be maintained. |
| format | Article |
| id | doaj-art-500b952a5e764cfaa62c8eda7f6385a5 |
| institution | Kabale University |
| issn | 1000-288X |
| language | zho |
| publishDate | 2023-06-01 |
| publisher | Science Press |
| record_format | Article |
| series | Shuitu baochi tongbao |
| spelling | doaj-art-500b952a5e764cfaa62c8eda7f6385a52024-11-13T03:48:33ZzhoScience PressShuitu baochi tongbao1000-288X2023-06-0143336637310.13961/j.cnki.stbctb.20230221.0021000-288X(2023)03-0366-08Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in MollisolsXue Haiqing0Yue Ya1Feng Qian2Long Jieqi3Miao Huan4Miao Shujie5Qiao Yunfa6School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, ChinaSchool of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, ChinaSchool of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, ChinaSchool of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, ChinaSchool of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, ChinaSchool of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, ChinaSchool of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, China[Objective] The effects of climate change on the stability of organic carbon were revealed from the perspective of the molecular structure of organic carbon in order to provide a theoretical basis for clarifying the impact of future climate change on organic carbon stability and soil fertility in mollisols. [Methods] A long-term field experiment dealing with the simulation of climate change through the use of open-top chambers (OTCs) at the Hailun Agroecological Experiment Station of the Chinese Academy of Sciences provided data for this study. We analyzed the organic carbon content and infrared spectral characteristics of various aggregates and density fractions in the 0—20 cm topsoil of black soil under three treatments: ① ambient temperature and CO2 concentration (aTaCO2); ② temperature elevated by 2 ℃ and ambient CO2 concentration (eTaCO2); ③ temperature elevated by 2 ℃ and CO2 enrichment to (700±25) μmol/mol (eTeCO2). [Results] Neither eTaCO2 nor eTeCO2 significantly affected organic carbon content of the bulk soil compared with aTaCO2 (p>0.05). However, eTaCO2 increased soil organic carbon (SOC) contents by 13.45% and 52.89% in the <0.053 mm size aggregates and occluded light fraction (OF), respectively, (p<0.05). eTeCO2 increased SOC content by 46.89% in the free light fraction (LF) (p<0.05). Compared with aTaCO2, both eTaCO2 and eTeCO2 treatments significantly influenced the SOC molecular structure of the bulk soil. The relative intensity of other functional groups was significantly affected, except for the aliphatic group (p<0.05). Moreover, eTeCO2 weakened the aliphatic group of organic carbon in the bulk soil and the >0.25 mm size aggregate, but increased the -CH/C=C ratio of organic carbon in the 0.25—0.053 mm size aggregates (p<0.05). Alcohols, aliphatic, aromatic, and polysaccharides were the major functional groups affected by climate change. Furthermore, compared with aTaCO2, eTaCO2 and eTeCO2 increased the -CH/C=C ratio in the LF and OF fractions, accelerating lipolysis in light fractions of organic carbon. [Conclusion] Climate change had no effect on the content of organic carbon in mollisols. Although increased temperature and CO2 had different effects on the composition and proportion of organic carbon molecular structure, organic carbon storage remained stable in mollisols. Climate change may have little effect on soil organic carbon storage, and the fertility level of the black soil can still be maintained.http://stbctb.alljournal.com.cn/stbctben/article/abstract/20230341climate changeorganic carbonaggregatesmollisolsdensity fractionsinfrared spectroscopy |
| spellingShingle | Xue Haiqing Yue Ya Feng Qian Long Jieqi Miao Huan Miao Shujie Qiao Yunfa Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in Mollisols Shuitu baochi tongbao climate change organic carbon aggregates mollisols density fractions infrared spectroscopy |
| title | Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in Mollisols |
| title_full | Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in Mollisols |
| title_fullStr | Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in Mollisols |
| title_full_unstemmed | Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in Mollisols |
| title_short | Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in Mollisols |
| title_sort | effects of elevated temperature and co2 enrichment on stability of soil organic carbon storage in mollisols |
| topic | climate change organic carbon aggregates mollisols density fractions infrared spectroscopy |
| url | http://stbctb.alljournal.com.cn/stbctben/article/abstract/20230341 |
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