| 大兴安岭秋季冻结期土壤水热变化对多年冻土泥炭地可溶性有机碳的影响北大核心CSCD |
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| 引用本文： | 孙超峰,宋立全,臧淑英,焦亚青,鲁博权.大兴安岭秋季冻结期土壤水热变化对多年冻土泥炭地可溶性有机碳的影响北大核心CSCD[J].冰川冻土,2022,44(2):402-414. |
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| 作者姓名： | 孙超峰 宋立全 臧淑英 焦亚青 鲁博权 |
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| 作者单位： | 1.哈尔滨师范大学 寒区地理环境监测与空间信息服务黑龙江省重点实验室, 黑龙江 哈尔滨 150025;2.黑龙江省寒区生态安全协同创新中心, 黑龙江 哈尔滨 150025 |
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| 基金项目： | 国家自然科学基金联合基金重点项目(U20A2082);国家自然科学基金面上项目(41971151);黑龙江省自然科学基金创新团队项目(TD2019D002) |
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| 摘 要： | 土壤温度和含水量是影响可溶性有机碳(DOC)变化的重要因素。然而,多年冻土泥炭地土壤DOC变化对秋季冻结期土壤水热变化的响应尚不明确。本研究选取大兴安岭3种多年冻土泥炭地小叶章泥炭地(CP)、兴安落叶松-泥炭藓泥炭地(LP)、白毛羊胡子苔草泥炭地(EP)]作为研究对象,开展野外原位试验探究秋季冻结期土壤水热变化对多年冻土泥炭地土壤DOC变化的影响。结果表明:秋季冻结期土壤DOC含量表现为EP>CP>LP,平均含量分别为83.99、45.75和43.13mg·L^(-1)。在秋季冻结前期3种类型多年冻土泥炭地土壤DOC含量均呈波动下降趋势,中、后期CP,LP土壤DOC变化较平缓。在秋季冻结前期,CP整体土壤DOC含量随浅层土壤温度的降低而减少;在后期CP浅层和整体土壤DOC含量随浅层土壤含水量的增加而增加。在秋季冻结中期,LP浅层土壤温度升高和含水量的减少,降低了土壤DOC含量;LP整体土壤DOC的变化随着浅层温度的升高逐渐降低。在秋季冻结后期,EP深层和整体土壤DOC含量随深层含水量增加而增加。在整个秋季冻结期,LP浅层土壤DOC主要受地表温度驱动,深层土壤DOC则主要受深层含水量的影响;整体土壤DOC则受地表温度影响较大。研究表明秋季冻结期多年冻土泥炭地土壤水热变化驱动土壤DOC含量的变化。研究结果为多年冻土区碳循环和“双碳”背景下的碳排放研究提供基础科学数据。
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| 关 键 词： | 大兴安岭 多年冻土 泥炭地 秋季冻结期 可溶性有机碳(DOC) 土壤水热 |
| 收稿时间： | 2021-10-24 |
| 修稿时间： | 2022-01-10 |
Effects of soil hydrothermal variations on soil DOC content in permafrost peatlands during autumn freezing period in the Greater Higgnan Mountains |
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| Chaofeng SUN,Liquan SONG,Shuying ZANG,Yaqing JIAO,Boquan LU.Effects of soil hydrothermal variations on soil DOC content in permafrost peatlands during autumn freezing period in the Greater Higgnan Mountains[J].Journal of Glaciology and Geocryology,2022,44(2):402-414. |
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| Authors: | Chaofeng SUN Liquan SONG Shuying ZANG Yaqing JIAO Boquan LU |
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| Institution: | 1.Heilongjiang Provincial Key Laboratory of Geographical Environment Monitoring and Spatial Information Services in Cold Regions，Harbin Normal University，Harbin 150025，China;2.Cooperative Innovation Center for Ecological Security in Cold Regions of Heilongjiang Province，Harbin 150025，China |
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| Abstract: | Soil temperature and moisture content are important factors affecting the change of dissolved organic carbon （DOC）. However， the response of soil DOC to soil hydrothermal during the autumn freezing period is not clear. Three types of permafrost peatlands ［Calamagrostis angustifolia （CP）， Larix gmelini-Sphagnum swamp （LP） and Eriophorum vaginatum （EP） peatland］ in the Greater Higgnan Mountains were selected as research objects in the study. Field in situ experiments were carried out to explore the effect of soil hydrothermal variations on soil DOC changes in permafrost peatland during autumn freezing period. The results showed that soil DOC content was in order： EP > CP > LP，with an average of 84.01，44.42 and 43.19 mg?L-1 respectively during the autumn freezing period. The content of soil DOC in the three types of permafrost peatlands fluctuated and decreased in the early autumn freezing period， while the variations of soil DOC content in CP and LP were gentle in the middle and late autumn freezing period. In the early autumn freezing period， the DOC content in the whole soil layer in CP decreased with the decrease of shallow soil temperature； however， the content of DOC in the shallow and the whole soil layer in CP increased with the increase of soil moisture content in the shallow layer in the late period. In the middle autumn freezing period， the shallow soil temperature increased and soil moisture content decreased in LP， which reduced soil DOC content； the content of DOC in the whole soil layer in LP decreased with the increase of the shallow temperature. In the late autumn freezing period， the content of DOC in the deep and whole soil layer in EP increased with the increase of soil moisture content in the deep soil layer. Besides， throughout the autumn freezing period， the shallow soil DOC content in LP was mainly driven by surface temperature， and deep soil DOC content in LP was mainly affected by soil moisture content in the deep soil layer； the whole soil DOC content was significantly affected by surface temperature. The study indicated that the variations of soil hydrothermal in the permafrost peatlands during autumn freezing period drove the changes of soil DOC content. The results of this study could provide basic scientific data for the study of carbon cycles in permafrost region and carbon emissions under the “double carbon” background. |
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| Keywords: | Greater Higgnan Mountains permafrost peatland autumn freezing period dissolved organic carbon （DOC） soil hydrothermal |
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