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

doi:10.11733/j.issn.1007-0435.2012.03.013

Acta Agrestia Sinica ›› 2012, Vol. 20 ›› Issue (3): 464-470.DOI: 10.11733/j.issn.1007-0435.2012.03.013

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. 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

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. 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

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

Abstract

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

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

CLC Number:

S812
Q948

CHEN Zhi-fang, JIA Ping-yang, YANG Yang, ZHANG Jian, XI Ji-le, ZHU Shu-sheng, ZHAO Meng-li, HAN Guo-dong, WANG Cheng-jie. Effects of Grazing Intensity on Ecosystem Gas Exchange of Different Grassland Types in Inner Mongolia[J]. Acta Agrestia Sinica, 2012, 20(3): 464-470.

陈志芳, 贾平洋, 杨阳, 张健, 希吉勒, 朱树声, 赵萌莉, 韩国栋, 王成杰. 放牧强度对不同草地类型生态系统气体交换影响的研究[J]. 草地学报, 2012, 20(3): 464-470.

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

放牧强度对不同草地类型生态系统气体交换影响的研究

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