干旱区研究

干旱区研究 ›› 2018, Vol. 35 ›› Issue (4): 796-803.doi: 10.13866/j.azr.2018.04.06

• 水土资源及其利用 • 上一篇    下一篇

西鄂尔多斯高原5种荒漠灌丛土壤碳排放特征

王珊1,2, 党晓宏1, 高永1,3, 胡生荣4, 王则宇1, 潘霞1   

  1. 1.内蒙古农业大学沙漠治理学院,内蒙古 呼和浩特 010018;
    2.内蒙古财经大学资源与环境经济学院,内蒙古 呼和浩特 010010;
    3.中央与地方共建风沙物理重点实验室,内蒙古 呼和浩特 010018;
    4.内蒙古自治区环境工程评估中心,内蒙古 呼和浩特 010011
  • 收稿日期:2017-09-19 修回日期:2018-02-02 出版日期:2018-07-15 发布日期:2025-11-18
  • 通讯作者: 高永. E-mail: 13948815709@163.com
  • 作者简介:王珊(1980-),女,副教授,从事荒漠化防治研究. E-mail: wangshan223@sina.com
  • 基金资助:
    引进国外先进林业科学技术项目“人工调控荒漠灌丛生态空间构型技术引进(2015-4-22)”;内蒙古自治区自然基金项目“珍稀植物沙冬青根部菌群生长的作用机制(2015MS0301)”

Soil Carbon Emission of Five Desert Shrubberies in the West Ordos Plateau

WANG Shan1,2, DANG Xiao-hong1, GAO Yong1,3, HU Sheng-rong4, WANG Ze-yu1, PAN Xia1   

  1. 1. College of Desert Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia,China;
    2. College of Resources and Environmental Economics, Inner Mongolia University of Finance and Economics, Hohhot 010018, Inner Mongolia,China;
    3. Central-local Governmental Key Laboratory of Wind Erosion, Hohhot 010018, Inner Mongolia,China;
    4. Inner Mongolia Environmental Assessment Center, Hohhot 010011, Inner Mongolia,China
  • Received:2017-09-19 Revised:2018-02-02 Published:2018-07-15 Online:2025-11-18

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摘要： 为了进一步厘定西鄂尔多斯高原地区5种天然荒漠灌丛土壤碳排放的主控因子,估算灌丛土壤碳排放量,并阐明不同灌丛土壤的碳排放特征,选用5种典型荒漠灌丛林为研究对象,通过土壤碳通量ACE(automated soil CO2 exchange station)监测系统分别测定了5种灌丛土壤呼吸速率、土壤温湿度及碳排放量。结果表明:① 5种灌丛土壤碳排放速率日动态总体呈现“不对称钟形”单峰曲线特性,峰值在11:30—13:30。5种灌丛生长季土壤碳排放速率均显著高于非生长季,其中半日花灌丛(Helianthemum songaricum Schrenk)比其他灌丛高0.76～1.67倍。土壤年平均碳排放量沙冬青灌丛为8 090.63 kg·hm-2·a-1、四合木灌丛7 868.16 kg·hm-2·a-1、霸王灌丛7 287.40 kg·hm-2·a-1、半日花灌丛8 375.69 kg·hm-2·a-1和红砂灌丛7 618.47 kg·hm-2·a-1;② 在3种未来气候情景(低排放情景B1、中等排放情景A1B和高排放情景A2)下,5种灌丛土壤碳排放量将比基准情景高达8.30%,其中霸王灌丛变化最为明显。不同类型灌丛地土壤碳排放对气温变化的响应存在差异,但差异不显著。本研究可为全球环境变化下中国西北干旱、半干旱地区碳平衡估算提供数据基础和参考依据。

关键词: 土壤, 荒漠灌丛, 碳排放速率, 气候情景, 西鄂尔多斯高原

Abstract: An Automated Soil CO2 Exchange Station was applied to study the soil CO2 emission and the main environmental factors of five desert shrubberies so as to get a more exact estimation of soil carbon emission and a clearer understanding of its affecting factors in the west Ordos Plateau. The results showed that the curve of daily variation of soil carbon emission rate was unimodal, and the maximum rate occurred during the period from 11:30 to 13:30 o’clock. The monthly soil carbon emission rate of the five desert shrubberies in growing season (from May to July) was much higher than that in non-growing season (October), and that of Helianthemum songaricum shrubbery was the highest and 0.76-1.67 times higher than that of other shrubberies. The annual average soil carbon emission rates under the shrubberies of Ammopiptanthus mongolicus, Zygophyllum xanthoxylum, Tetraena mongolica, H. songaricum and Reaumuria songarica were 8 090.63, 7 287.40, 7 868.16, 8 375.69 and 7 618.47 kg·hm-2·a-1 respectively. In the three future climate scenarios (low emission scenario B1, moderate emission scenario A1B and high emission scenario A2), the average soil carbon emission of five desert shrubberies would be increased by 8.30% compared with that in the baseline scenario, especially in the Z. xanthoxylum shrubbery. The response of soil carbon emission of different shrubberies to temperature change was different, but the difference was not significant. The research results could be referred in estimating carbon balance in arid and semiarid regions in the northwest China under global environmental change.

Key words: soil, desert shrubbery, carbon emission rate, climate scenario, west Ordos Plateau