祁连山黑河上游多年冻土区不同植被类型土壤有机碳密度分布特征

doi:10.7522/j.issn.1000-0240.2018.0048

冰川冻土 ›› 2018, Vol. 40 ›› Issue (3): 426-433.doi: 10.7522/j.issn.1000-0240.2018.0048

祁连山黑河上游多年冻土区不同植被类型土壤有机碳密度分布特征

马素辉^1,2, 牟翠翠^1,3, 郭红¹, 张现凯¹, 栗泽苑^1,4, 张廷军¹

1. 兰州大学资源环境学院西部环境教育部重点实验室, 甘肃兰州 730000;
2. 北京大学城市与环境学院, 北京 100781;
3. 中国科学院西北生态环境资源研究院冻土工程国家重点实验室, 甘肃兰州 730000;
4. 山东大学环境研究院, 山东济南 250100

收稿日期:2017-12-01 修回日期:2018-03-16 出版日期:2018-06-25 发布日期:2018-07-16
通讯作者: 牟翠翠,E-mail:mucc@lzu.edu.cn E-mail:mucc@lzu.edu.cn
作者简介:马素辉(1992-),男,甘肃陇南人,2015年在兰州大学获学士学位,现为北京大学在读博士研究生,从事全球变化生态学方向研究.E-mail:mash2015@pku.edu.cn
基金资助:
国家自然科学基金项目（41601063）；冻土工程国家重点实验室开放基金项目（SKLFSE201408）；兰州大学中央高校基本科研业务费专项（lzujbky-2015-ot03）；兰州大学中央高校基本科研业务费专项（lzujbky-2017-223）资助

Distribution features of permafrost organic carbon density on different vegetation types in the upper reaches of Heihe River, Qilian Mountains

MA Suhui^1,2, MU Cuicui^1,3, GUO Hong¹, ZHANG Xiankai¹, LI Zeyuan^1,4, ZHANG Tingjun¹

1. Key Laboratory of Western China's Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 73000, China;
2. College of Urban and Environmental Sciences, Peking University, Beijing 100781, China;
3. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
4. Environment Research Institute, Shandong University, Jinan 250100, China

Received:2017-12-01 Revised:2018-03-16 Online:2018-06-25 Published:2018-07-16

摘要/Abstract

摘要： 山地多年冻土的异质性影响其植被类型的分布特征，且对有机碳的分布也具有重要影响。通过采集黑河上游多年冻土区三种典型植被类型（高寒沼泽草甸、高寒草甸、高寒草原）8个活动层的土壤样品，测定其土壤有机碳密度及其理化性质。结果表明：高寒沼泽草甸土壤有机碳密度最高（49.50 kg·m^-2），高寒草甸次之（11.22 kg·m^-2），高寒草原最低（7.30 kg·m^-2）。土壤有机碳密度的剖面垂直分布特征具有差异性，高寒沼泽草甸土壤有机碳密度随深度变化不明显，高寒草原和高寒草甸土壤有机碳密度随深度逐渐减小，存在显著的表层聚集性。有机碳密度与土壤含水率和细粒含量呈显著正相关，与pH值呈显著负相关关系。一般线性模型结果表明土壤含水率、pH值和土壤颗粒组成解释了96.39%的有机碳密度变异，其中土壤含水率贡献了81.53%，pH值和土壤粒度分别贡献了9.33%和4.75%。研究表明多年冻土区不同植被类型土壤有机碳密度分布特征具有明显差异，山地多年冻土土壤含水率是控制有机碳密度分布特征的重要影响因素。

关键词: 祁连山, 多年冻土区, 植被类型, 有机碳密度, 土壤含水率

Abstract: The heterogeneity of mountain permafrost affects the alpine vegetation type and have an effect on the distribution of soil organic carbon (SOC). In this study, the SOC densities and soil physical and chemical properties were measured on soil samples, which sampled from eight active layers within three types of vegetation cover (swamp meadow, alpine swamp meadow and alpine steppe). It was found that the average SOC density was highest in alpine swamp meadow (49.50 kg·m^-2), following by alpine meadow (11.22 kg·m^-2), and in alpine steppe it was the lowest (7.30 kg·m^-2). In a vertical profile of SOC density, there was a slightly difference:no obvious variation in alpine swamp meadow, decreasing with depth in alpine meadow and alpine steppe, with a significant aggregation in surface. There were positive relationships between SOC density and soil moisture, silt and clay content, and a negative relationship between SOC density and pH value. General linear model result shows that the soil moisture content, pH value and soil particle composition are able to explain 96.39% of the organic carbon density variation, of which 81.53%, 9.33% and 4.75% are attributed to soil moisture, pH value and soil texture, respectively. It means that soil moisture plays a key role in distribution of SOC density in alpine permafrost regions.

Key words: Qilian Mountains, permafrost, vegetation types, soil organic carbon density, soil moisture

中图分类号:

P642.14

马素辉, 牟翠翠, 郭红, 张现凯, 栗泽苑, 张廷军. 祁连山黑河上游多年冻土区不同植被类型土壤有机碳密度分布特征[J]. 冰川冻土, 2018, 40(3): 426-433.

MA Suhui, MU Cuicui, GUO Hong, ZHANG Xiankai, LI Zeyuan, ZHANG Tingjun. Distribution features of permafrost organic carbon density on different vegetation types in the upper reaches of Heihe River, Qilian Mountains[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2018, 40(3): 426-433.

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祁连山黑河上游多年冻土区不同植被类型土壤有机碳密度分布特征

Distribution features of permafrost organic carbon density on different vegetation types in the upper reaches of Heihe River, Qilian Mountains

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