1.内蒙古农业大学 林学院, 内蒙古 呼和浩特 010018
2.内蒙古自治区气象局, 内蒙古 呼和浩特 010051
冯辉(1999—),女(蒙古族),内蒙古自治区锡林郭勒盟人,硕士研究生,研究方向为森林土壤碳循环。Email:3119863516@qq.com。
马秀枝(1974—),女(汉族),内蒙古自治区呼和浩特市人,博士,教授,主要从事陆地生态系统碳氮循环及温室气体相关研究。Email:Luckmxy@imau.edu.cn。
收稿:2024-11-10,
修回:2025-01-13,
纸质出版:2025-06-10
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冯辉, 马秀枝, 李长生, 等.增温对内蒙古大青山油松人工林土壤团聚体及有机碳分布的影响[J].水土保持通报,2025,45(3):253-260.
Feng Hui, Ma Xiuzhi, Li Changsheng, et al. Effects of warming on soil aggregates and organic carbon distribution at Pinus tabulaeformis plantations in Daqingshan Mountains, Inner Mongolia [J]. Bulletin of Soil and Water Conservation,2025,45(3):253-260.
冯辉, 马秀枝, 李长生, 等.增温对内蒙古大青山油松人工林土壤团聚体及有机碳分布的影响[J].水土保持通报,2025,45(3):253-260. DOI: 10.13961/j.cnki.stbctb.2025.03.010. CSTR: 32312.14.stbctb.2025.03.010..
Feng Hui, Ma Xiuzhi, Li Changsheng, et al. Effects of warming on soil aggregates and organic carbon distribution at Pinus tabulaeformis plantations in Daqingshan Mountains, Inner Mongolia [J]. Bulletin of Soil and Water Conservation,2025,45(3):253-260. DOI: 10.13961/j.cnki.stbctb.2025.03.010. CSTR: 32312.14.stbctb.2025.03.010..
目的
2
分析土壤团聚体粒级组成和稳定性及各级团聚体有机碳含量对模拟增温的响应,为明晰内蒙古大青山油松人工林土壤结构稳定性和碳储能力在气候变暖背景下的动态变化提供科学依据。
方法
2
以内蒙古大青山油松人工林0—40 cm土壤为研究对象,基于连续4 a的全年野外模拟增温试验,采用湿筛法将土壤分成>0.25 mm,0.25~0.053 mm、<0.053 mm这3个粒级,并测量各粒级团聚体内的有机碳含量。
结果
2
①研究区土壤以微团聚体为优势粒级,增温显著降低了各土层土壤大团聚体和微团聚体含量,而粉黏粒团聚体含量在各土层中均表现为显著增加,分别增加14.92%,14.01%,13.84%; ②与对照相比,增温后土壤平均重量直径(MWD)和几何平均直径(GMD)均显著降低,MWD在各土层分别下降了5.93%,3.66%和5.68%,GMD在各土层分别减少8.83%,8.41%,10.63%; ③两种处理下各土层中均是土壤粉黏粒有机碳含量最高,增温使各土层粉黏粒团聚体内的有机碳含量升高却降低了大团聚体和微团聚体内的有机碳含量;增温后表层土壤总有机碳含量升高,而10—20 cm和20—40 cm土层的有机碳含量下降; ④在增温条件下土壤粉黏粒团聚体的有机碳贡献率最大,与对照相比,增温后土壤粉黏粒的有机碳贡献率各土层分别增加44.39%,39.60%和43.31%,其次为微团聚体,土壤大团聚体的有机碳贡献率最低。
结论
2
增温导致土壤团聚体组成发生变化,破坏了土壤团聚体的稳定性,并且降低大团聚体和微团聚体内有机碳含量,表明增温不利于土壤有机碳的物理保护。
Objective
2
The response of soil aggregate grain size composition and stability and the organic carbon content of all aggregate levels to simulated warming were analyzed to provide a scientific basis for the dynamic changes in soil structure stability and carbon storage capacity of the
Pinus tabulaeformis
plantation forest in Daqingshan Mountains, Inner Mongolia, in the context of climate warming.
Methods
2
Soil samples were collected from a depth of 0—40 cm from a
P. tabulaeformis
plantation on Daqing Mountains, Inner Mongolia. Based on a four-year field warming experiment, wet sieving was used to separate the soil into three aggregate size fractions, namely,
>
0.25 mm, 0.25—0.053 mm, and
<
0.053 mm. The organic carbon content of each aggregate fraction was measured.
Results
2
Microaggregates were the dominant fraction in the study area. Warming reduced the content of macroaggregates and microaggregates in all soil layers. Meanwhile, the content of silt-clay aggregates increased significantly by 14.92%, 14.01%, and 13.84% in each layer, respectively. Compared to the control, the mean weight diameter (MWD) and geometric mean diameter (GMD) of soil aggregates decreased significantly under warming. The MWD decreased by 5.93%, 3.66%, and 5.68% in each layer, whereas the GMD decreased by 8.83%, 8.41%, and 10.63%, respectively. Under both treatments, the organic carbon content was the highest in the silt-clay fraction. Warming increased the organic carbon content in the silt-clay fraction but decreased it in the macroaggregate and microaggregate fractions. The total organic carbon content increased in the surface soil layer but decreased in the 10—20 cm and 20—40 cm layers. Under warming conditions, the silt-clay fraction contributed the most to the SOC. Compared with the control, the contribution rate of organic carbon in the silt-clay fraction increased by 44.39%, 39.60%, and 43.31% in each layer, respectively, followed by the microaggregate fraction. The macroaggregate fraction had the lowest contribution.
Conclusion
2
Warming altered the composition of soil aggregates, destabilized the soil aggregate structure, and reduced the organic carbon content in macro-and microaggregates, indicating that warming was detrimental to the physical protection of soil organic carbon.
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