草地学报 ›› 2024, Vol. 32 ›› Issue (4): 1177-1183.DOI: 10.11733/j.issn.1007-0435.2024.04.021

• 研究论文 • 上一篇    

放牧对荒漠草原主要植物种群空间格局与生态位的影响

熊梅1, 安海波1, 赵萌莉2, 乔荠瑢2, 张峰2, 郑佳华2   

  1. 1. 内蒙古民族大学农学院, 内蒙古 通辽 028000;
    2. 内蒙古农业大学草原与资源环境学院, 内蒙古 呼和浩特 010011
  • 收稿日期:2023-08-27 修回日期:2023-10-09 发布日期:2024-05-07
  • 通讯作者: 熊梅,E-mail:1024720658@qq.com;赵萌莉,E-mail:nmgmlzh@126.com
  • 作者简介:熊梅(1989-),女,汉族,内蒙古乌海人,博士,讲师,主要从事草地管理与利用研究,E-mail:1024720658@qq.com
  • 基金资助:
    国家自然基金项目(31660108和31861143001);内蒙古农业大学草地资源教育部重点实验室资助

Effect of Grazing on Spatial Pattern and Niche Characteristics of Main Species in Desert Steppe

XIONG Mei1, AN Hai-bo1, ZHAO Meng-li2, QIAO Ji-rong2, ZHANG Feng2, ZHENG Jia-hua2   

  1. 1. College of Agriculture, Inner Mongolia Minzu University, Tongliao, Inner Mongolia 028000, China;
    2. College of Grassland, Resource and Environment, Inner Mongolia Agriculture University, Hohhot, Inner Mongolia 010011, China
  • Received:2023-08-27 Revised:2023-10-09 Published:2024-05-07

摘要: 本研究以短花针茅(Stipa breviflora)荒漠草原为研究对象,在长期不同载畜率(对照CK、轻度放牧LG、中度放牧MG和重度放牧HG)放牧样地,通过群落调查探讨建群种短花针茅、优势种冷蒿(Artemisia frigida)和无芒隐子草(Cleistogenes songorica)以及主要伴生种银灰旋花(Convolvulus ammannii)的空间分布格局和生态位特征。结果表明:物种多样性指数随载畜率增加而降低,在HG处理显著低于其他处理(P<0.05);不同载畜率下,4种植物均为聚集分布的格局;随载畜率的增加,短花针茅和无芒隐子草的聚集强度降低,生态位变宽,冷蒿和银灰旋花的聚集强度提高,生态位变窄;短花针茅和无芒隐子草之间的生态位重叠随载畜率的增加而增加,二者的种间竞争作用加强,而冷蒿和银灰旋花之间或二者与短花针茅或无芒隐子草之间的生态位重叠均降低。综上,放牧改变了4种植物种群的空间分布和生态位,随载畜率增加,群落中短花针茅和无芒隐子草在群落中处于优势地位,冷蒿和银灰旋花在群落中的地位减弱。

关键词: 载畜率, 空间格局, 荒漠草原, 生态位

Abstract: In this study,Stipa breviflora desert steppe was selected as the research object. In the enclosed grazing plots with different stocking rates (control,CK;lightly grazed LG;moderately grazed,MG and heavily grazed,HG) over an extended period,the characteristics of constructive species S. breviflora,the dominant species Artemisia frigida and Cleistogenes songorica,and the main associated species Convolvulus ammannii were investigated. The results showed that the diversity index decreased with an increase in stocking rate,and they were significantly lower in HG than in other treatments (P<0.05). The distribution pattern of the 4 species were all aggregated pattern under different stocking rates. With the increase in stocking rate,the aggregation intensity of S. breviflora and Cleistogenes songorica decreased and the niche width increased,while the aggregation intensity of Artemisia frigida and Convolvulus ammannii increased and the niche width narrowed. With the increase in stocking rate,the niche overlap between S. breviflora and Cleistogenes songorica was increased,and the interspecific competition between them was strengthened. However,the niche overlap between Artemisia frigida and Convolvulus ammannii or between them and S. breviflora or Cleistogenes songorica decreased. In conclusion,the spatial distribution and ecological niche of the 4 species were changed over grazing. With the increase in stocking rate,S. breviflora and Cleistogenes songorica were in a dominant position in the community,while Artemisia frigida and Convolvulus ammannii were in a weakened position in the community.

Key words: Stocking rates, Spatial pattern, Desert steppe, Niche

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