草地学报 ›› 2012, Vol. 20 ›› Issue (3): 464-470.DOI: 10.11733/j.issn.1007-0435.2012.03.013

• 研究论文 • 上一篇    下一篇

放牧强度对不同草地类型生态系统气体交换影响的研究

陈志芳1, 贾平洋2, 杨阳1, 张健1, 希吉勒1, 朱树声3, 赵萌莉1, 韩国栋1, 王成杰1   

  1. 1. 内蒙古农业大学生态环境学院, 内蒙古 呼和浩特 010018;
    2. 内蒙古农业大学林学院, 内蒙古 呼和浩特 010018;
    3. 内蒙古牙克石市草原工作站, 内蒙古 牙克石 022150
  • 收稿日期:2011-11-29 修回日期:2012-01-15 出版日期:2012-06-15 发布日期:2012-07-05
  • 通讯作者: 赵萌莉,E-mail:menglizhao@yahoo.com
  • 作者简介:陈志芳(1986- ),女,内蒙古乌兰察布人,硕士研究生,主要从事草地生态学方向的研究,E-mail: qiangfang_2005@163.com
  • 基金资助:
    国家自然科学基金(31070414)(31170446)(30960072);内蒙古农业大学草业与草地资源重点实验室资助

Effects of Grazing Intensity on Ecosystem Gas Exchange of Different Grassland Types in Inner Mongolia

CHEN Zhi-fang1, JIA Ping-yang2, YANG Yang1, ZHANG Jian1, XI Ji-le1, ZHU Shu-sheng3, ZHAO Meng-li1, HAN Guo-dong1, WANG Cheng-jie1   

  1. 1. College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China;
    2. Forestry College of Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China;
    3. Yakeshi Grassland Workstations, Yakeshi, Inner Mongolia 022150, China
  • Received:2011-11-29 Revised:2012-01-15 Online:2012-06-15 Published:2012-07-05

摘要: 为揭示不同放牧强度下不同草原类型气体交换的变化规律,在8月中旬采用Li-6400 便携式光合仪和密闭式箱法,分别对内蒙古草甸草原、典型草原和荒漠草原不同放牧强度下气体交换进行分析研究。结果表明:不同草原类型之间的生态系统净CO2交换(NEE)、生态系统总呼吸(ER)和生态系统总初级生产力(GEP)均存在显著差异(P<0.05)。草甸草原的NEE和GEP随放牧强度增加呈现降低趋势,ER则呈现上升趋势;典型草原的NEE和GEP随放牧强度增加呈现上升趋势,ER则呈现下降趋势;荒漠草原的NEE和GEP除对照区外,随放牧强度增加呈现上升趋势,而ER呈降低趋势。放牧通过对草原生态系统植物、土壤等产生影响,从而影响生态系统气体交换。

关键词: 放牧强度, 生态系统净CO2交换, 生态系统总呼吸, 生态系统总初级生产力

Abstract: In order to reveal the variation of gas exchange under different grazing intensities and grassland types in Inner Mongolia, gas exchange under different grazing intensities for three main grassland types (meadow steppe, typical steppe and desert steppe) were measured by using infrared analyzer (IRGA; LI-6400, Li-Cor, Lincoln, NE, USA) with a transparent chamber (0.5 m×0.5 m×0.5 m) in middle August. Results indicated that ecosystem net CO2 exchange (NEE), ecosystem respiration (ER) and gross ecosystem productivity (GEP) were significantly different between types (P<0.05). NEE and GEP decreased and ER increased in meadow steppe with grazing intensities increasing. NEE and GEP increased and ER decreased in typical steppe with grazing intensities increasing; NEE and GEP increased and ER decreased in desert steppe with grazing intensities increasing compared to control. Grazing affected ecosystem gas exchange through influencing plants and soil of grassland ecosystem.

Key words: Grazing intensity, Ecosystem net CO2 exchange, Ecosystem respiration, Gross ecosystem productivity

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