Effects of Elevated Temperature and CO<sub>2</sub> Enrichment on Stability of Soil Organic Carbon Storage in Mollisols

Xue Haiqing; Yue Ya; Feng Qian; Long Jieqi; Miao Huan; Miao Shujie; Qiao Yunfa

doi:10.13961/j.cnki.stbctb.20230221.002

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Effects of Elevated Temperature and CO₂ Enrichment on Stability of Soil Organic Carbon Storage in Mollisols

- Effects of Elevated Temperature and CO₂ Enrichment on Stability of Soil Organic Carbon Storage in Mollisols
- Bulletin of Soiland Water Conservation Vol. 43, Issue 3, Pages: 366-373(2023)
- 作者机构：
  
  南京信息工程大学应用气象学院,南京,210044
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20230221.002
  CLC： S153.6
- Published：2023
- 稿件说明：
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Xue Haiqing, Yue Ya, Feng Qian, et al. Effects of Elevated Temperature and CO₂ Enrichment on Stability of Soil Organic Carbon Storage in Mollisols[J]. Bulletin of Soiland Water Conservation, 2023, 43(3): 366-373.
DOI：

Xue Haiqing, Yue Ya, Feng Qian, et al. Effects of Elevated Temperature and CO₂ Enrichment on Stability of Soil Organic Carbon Storage in Mollisols[J]. Bulletin of Soiland Water Conservation, 2023, 43(3): 366-373. DOI： 10.13961/j.cnki.stbctb.20230221.002.

摘要

[目的

]

从有机碳分子结构角度来揭示气候变化对黑土有机碳(SOC)稳定性的影响，阐明未来气候变化对黑土有机碳稳定性以及土壤肥力的影响。[方法

]

以中国科学院海伦农业生态试验站长期定位模拟气候变化开顶箱(OTC)试验为平台，对当前大气温度和CO

浓度(aTaCO

)，增温2 ℃和当前大气CO

浓度(eTaCO

)，增温2 ℃和CO

浓度增为(700±25) μmol/mol(eTeCO

)3个处理条件下0—20 cm黑土耕层土壤的团聚体和密度组分的有机碳含量和红外光谱特征进行分析。[结果

]

与aTaCO

相比，eTaCO

和eTeCO

均未对全土有机碳含量产生显著影响(p＞0.05)，但是eTaCO

使＜0.053 mm团聚体和闭蓄态轻组(occluded light fractionation， OF)中SOC含量分别增加了13.45%和52.89%(p＜0.05)；eTeCO

处理中游离态轻组(free light fractionation， LF)SOC含量增加了46.89%(p＜0.05)。红外光谱分析结果表明：与aTaCO

相比，eTaCO

和eTeCO

处理均对全土有机碳的分子结构产生了影响，尤其是eTeCO

处理除了脂肪族外，其他官能团特征峰相对强度均受到显著影响(p＜0.05)。eTeCO

处理减弱了全土以及＞0.25 mm团聚体有机碳的脂肪性，增加了0.25~0.053 mm团聚体中有机碳的官能团(-CH/C=C)比值(p＜0.05)，且主成分分析结果表明：气候变化影响较大的官能团为醇酚、脂肪族、芳香族和多糖。此外，相比于aTaCO

，eTaCO

和eTeCO

处理使得LF和OF组分中有机碳的-CH/C=C比值升高，加速了轻组有机碳脂肪化。[结论

]

气候变化未对黑土有机碳含量产生影响，虽然增温和增CO

对有机碳分子结构组分和比例有不同程度的影响，但最终黑土有机碳储量保持稳定。在合理利用的前提下，未来

气候变化可能对黑土有机碳库储量的影响不大，黑土肥力水平仍能维持。

Abstract

[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.

关键词

Keywords

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⁰

Effects of Elevated Temperature and CO2 Enrichment on Stability of Soil Organic Carbon Storage in Mollisols

DOI：10.13961/j.cnki.stbctb.20230221.002

摘要

Abstract

关键词

Keywords

references

Effects of Elevated Temperature and CO₂ Enrichment on Stability of Soil Organic Carbon Storage in Mollisols