| 大兴安岭多年冻土泥炭地无机氮动态对秋季冻融的响应北大核心CSCD |
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| 引用本文： | 焦亚青,宋立全,臧淑英,孙超峰,鲁博权.大兴安岭多年冻土泥炭地无机氮动态对秋季冻融的响应北大核心CSCD[J].冰川冻土,2022,44(2):387-401. |
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| 作者姓名： | 焦亚青 宋立全 臧淑英 孙超峰 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： | 大兴安岭多年冻土泥炭地是对全球变暖响应敏感的地区之一。在全球变暖、多年冻土退化背景下,为了探明秋季冻融对多年冻土泥炭地无机氮时空变化的影响,本研究于2019年9—11月以大兴安岭三种多年冻土泥炭地为研究对象进行野外原位实验,分析了秋季冻融前、中和后期多年冻土泥炭地浅层和深层土壤无机氮的时空变化特征以及浅层和深层土壤含水量和温度的变化规律,建立了土壤无机氮含量与土壤温度和含水量间的多元线性回归模型。研究表明:多年冻土小叶章泥炭地(XY)、兴安落叶松-泥炭藓泥炭地(XA)和白毛羊胡子苔草泥炭地(BM)的土壤铵态氮(NH_(4)^(+)-N)含量变化范围:(1.00±0.00)~(20.60±0.20)mg·kg^(-1),硝态氮(NO_(3)^(-)-N)含量的变化范围:(0.02±0.01)~(14.64±1.11)mg·kg^(-1),且无机氮以土壤NH_(4)^(+)-N为主;秋季冻融后期无机氮含量明显高于前期。尽管水热交互作用对该时期无机氮没有显著影响,但是在不同冻融阶段,无机氮对环境因子的响应程度存在差异:在秋季冻融前、中和后期浅层无机氮动态分别与浅层温度和含水量的变化相关,但在整个秋季冻融期间BM浅层无机氮含量仅对10~20 cm含水量存在响应(R^(2)=0.344,P<0.01)。研究表明,秋季冻融期内,多年冻土泥炭地无机氮发生初步累积,且浅层环境因子对无机氮响应程度最大。本研究可补充大兴安岭多年冻土泥炭地秋季冻融对土壤无机氮影响研究的相关数据,并为多年冻土泥炭地响应全球变暖的温室气体释放的研究提供基础数据支撑。
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| 关 键 词： | 多年冻土泥炭地 无机氮 秋季冻融 温度 含水量 大兴安岭 |
| 收稿时间： | 2021-10-24 |
| 修稿时间： | 2022-01-07 |
Response of inorganic nitrogen dynamics to autumn freeze-thaw in permafrost peatlands of the Greater Higgnan Mountains |
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| Yaqing JIAO,Liquan SONG,Shuying ZANG,Chaofeng SUN,Boquan LU.Response of inorganic nitrogen dynamics to autumn freeze-thaw in permafrost peatlands of the Greater Higgnan Mountains[J].Journal of Glaciology and Geocryology,2022,44(2):387-401. |
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| Authors: | Yaqing JIAO Liquan SONG Shuying ZANG Chaofeng SUN 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: | Permafrost peatlands in the Greater Higgnan Mountains are one of the areas sensitive to global warming response. In the context of global warming and permafrost degradation， to investigate the spatial-temporal variations of inorganic nitrogen in permafrost peatlands during the autumn freeze-thaw， this study was conducted in situ field experiments from September to November 2019 in the three permafrost peatlands in the Greater Higgnan Mountains， and analyzed the spatial and temporal variations of inorganic nitrogen in the shallow and deep layers of permafrost peatlands during the prophase， metaphase and anaphase of the autumn freeze-thaw. A multiple linear regression model was established for the relationship between soil inorganic nitrogen content and soil hydrothermal factors. The results of the study showed that the ranges of soil ammonium nitrogen （NH4+-N） concentration in the permafrost peatlands（Calamagrostis angustifolia peatland， XY）， （Larix gmelina-Sphagnum peatland， XA）， and （Eriophorum vaginatum peatland， BM） were （1.00±0.00）~（20.60±0.20） mg?kg-1， and the ranges of nitrate nitrogen （NO3--N） concentration were （0.02±0.01）~（14.64±1.11） mg?kg-1. The inorganic nitrogen was dominated by soil NH4+-N， and inorganic nitrogen concentrations were significantly higher during the anaphase of the autumn freeze-thaw than that of the prophase. Although hydrothermal interactions did not significantly affect inorganic nitrogen during this freeze-thaw， the BM inorganic nitrogen concentrations in the shallow layers were most responsive to 10~20 cm water content throughout the freeze-thaw period （R2=0.344， P<0.01）， and the inorganic nitrogen concentrations in the shallow layers was only related to soil moisture and temperature in the shallow layers during the prophase， metaphase and anaphase of the autumn freeze-thaw. The study showed that the autumn freeze-thaw could affect the inorganic nitrogen dynamics in the permafrost peatlands， and that the variations of the soil moisture and temperature in the shallow layers affected the inorganic nitrogen concentrations. This study could complement the data on the effect of autumn freeze-thaw on soil inorganic nitrogen in permafrost peatlands in the Greater Higgnan Mountains and provide basic data for the study of greenhouse gas emissions in response to global warming. |
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| Keywords: | permafrost peatlands inorganic nitrogen autumn freeze-thaw temperature moisture content Greater Higgnan Mountains |
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