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首页> 中文期刊> 《生态环境学报》 >青藏高原表土有机碳、全氮含量分布及其影响因素

青藏高原表土有机碳、全氮含量分布及其影响因素

         
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摘要

The soil ecosystem of the Qinghai-Tibet Plateau ecosystem represents a huge pool of carbon and nitrogen. The emission of its organic carbon pool and total nitrogen pool greatly affects the concentration of greenhouse gases, such as CO2, CH4and N2O in the atmosphere and thus might have an impact on global climate change. In order to identify the different factors which control the carbon and nitrogen distribution in soils developed under different vegetation covers and types, 75 surface soil samples were collected along an altitude gradient in the Qinghai-Tibet Plateau from July to October 2013. The sampling sites were categorized according to the type of vegetation and cover in alpine meadow, alpine steppe, desert, shrubland, forest, and saline-alkali land. For each site, the soil organic carbon (SOC) and total nitrogen (TN) contents were analyzed along with different parameters. The Least Significant Difference (LSD) method was used to compare the differences of SOC, TN contents and ω(C)/ω(N) ratios measured in the topsoil samples for different categories of vegetation types. In addition, we performed a statistic analysis based on Pearson Correlation and Stepwise Regression Analysis (SRA), to identify the factors controlling the OC and TN contents as well as the ω(C)/ω(N)ratios of the soils.The results showed that the type of vegetation influences the SOC and TN contents of the soils.The highest SOC and TN contents were observed for the alpine meadow, with an average content of 1.38 g·kg-1and 0.23 g·kg-1, respectively, whereas the lowest SOC and TN contents were measured in the desert soils with an average content of 1.38 g·kg-1and 0.23 g·kg-1, respectively. Except for several samples collected in forest lands which display ω(C)/ω(N) ratio larger than 25.00, the ω(C)/ω(N)ratio of most of the samples were in the range of 4.00~25.00.In addition,the average value of theω(C)/ω(N)ratios in the soils of the Qinghai-Tibet Plateau was higher than that in China. The SRA showed that soil carbon and nitrogen contents on the Qinghai-Tibet Plateau were influenced by multiple environmental factors. The impact of environmental factors on SOC content were in order of importance: Alkalinity (Alk)>pH value>clay content, whereas for the TN content, these factors ranked in the following order: Alk>clay content>pH value. However, the ω(C)/ω(N) ratio was mainly controlled by the Average Monthly Temperature (AMT).%青藏高原土壤生态系统碳氮库容量巨大,其有机碳库、全氮库及碳氮排放,对大气中CO2、CH4、N2O等温室气体浓度影响较大,进而影响全球气候变化.为揭示青藏高原地区不同植被类型、不同海拔的表土碳氮元素含量分布及其影响因素,于2013年7—8月在青藏高原公路沿线设置75个采样点,采集表土,并根据采样点植被覆盖情况将其划分为高寒草甸、高山草原、荒漠、灌丛、林地和盐碱地等6种类型.对青藏高原6种类型表土有机碳、全氮含量进行了测定,采用最小显著差异法比较了不同植被类型表土有机碳、全氮含量及碳氮比值差异的显著性,并通过Pearson相关和逐步回归分析方法对其影响因素进行了探讨.结果表明:青藏高原不同植被类型表土有机碳和全氮含量具有一定差异,其中以高寒草甸表土有机碳、全氮质量分数最高,平均质量分数分别为42.82 g·kg-1、3.08 g·kg-1,荒漠最低,平均质量分数分别为1.38 g·kg-1、0.23 g·kg-1.就碳氮比值而言,除林地个别样点碳氮比值高于25.00以外,其他植被类型土壤碳氮比值均分布在4.00~25.00范围内,且研究区土壤碳氮比平均值均高于中国土壤碳氮比的平均水平.由逐步回归分析可知,青藏高原土壤碳氮含量受多种环境因子的协同影响,环境因子对土壤有机碳的重要性排序为土壤碱度>pH值>黏粒含量,影响土壤全氮的环境因子重要性排序为土壤碱度>黏粒含量>pH值,影响土壤碳氮比值的环境因子主要为月均气温.

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  • 来源
    《生态环境学报》 |2018年第5期|866-872|共7页
  • 作者

    张亚亚; 郭颖; 刘海红; 刘胤序; 刘小龙; 李军;

  • 作者单位

    深圳市深港产学研环保工程技术股份有限公司,广东 深圳 518071;

    天津师范大学天津市水资源与水环境重点实验室,天津 300387;

    天津师范大学地理与环境科学学院,天津 300387;

    深港产学研基地(北京大学香港科技大学深圳研修院),广东 深圳 518071;

    天津师范大学天津市水资源与水环境重点实验室,天津 300387;

    天津师范大学地理与环境科学学院,天津 300387;

    天津师范大学天津市水资源与水环境重点实验室,天津 300387;

    天津师范大学地理与环境科学学院,天津 300387;

    天津师范大学天津市水资源与水环境重点实验室,天津 300387;

    天津师范大学地理与环境科学学院,天津 300387;

    天津师范大学天津市水资源与水环境重点实验室,天津 300387;

    天津师范大学天津市水资源与水环境重点实验室,天津 300387;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 土壤学;环境地理学;
  • 关键词

    有机碳; 全氮; 碳氮比值; 含量特征; 影响因素;

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