Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (4): 763-771.DOI: 10.11733/j.issn.1007-0435.2021.04.017

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Effect of Rest-grazing in Regreen-up Period on Plant Community Characteristics of Maduo Alpine Steppe

WANG Chao1, WANG Xiao-li1, SHI Jian-jun1*, WU Jian-li1, XING Yun-fei1,Cairenqiuji2, Yixicuomao2   

  1. 1. Academy of Animal and Veterinary Science,Qinghai University / Qinghai Academy of Animal and Veterinary Science / The key laboratory of the Ministry of Education was jointly established by the Ministry of Education and the Alpine Grassland Ecology, Xining, Qinghai Province 810016, China;
    2. Ecological Protection Station of Qumalai County Management Office,Source Area of Yangtze River, Yushu, Qinghai Province 815500, China
  • Received:2020-10-30 Revised:2020-12-06 Published:2021-06-02
  • Contact: * E-mail:shjj0318@sina.com

返青期休牧对玛多高寒草原植物群落特征的影响

王超1, 王晓丽1, 施建军1*, 吴建丽1, 邢云飞1, 才仁求吉2, 义西措毛2   

  1. 1.青海大学畜牧兽医科学院/青海省畜牧兽医科学院/三江源区高寒草地生态省部共建教育部重点实验室, 青海 西宁 810016;
    2.长江源区曲麻莱县管理处生态保护站, 青海 玉树 815000
  • 通讯作者: * E-mail:shjj0318@sina.com
  • 作者简介:王超(1996-),男,青海同仁人,硕士研究生,主要从事高寒草地生态研究,E-mail:912882398@qq.com
  • 基金资助:
    2019年度青海三江源生态保护和建设二期工程科研和推广项目(2019-S-1-5);科技部国家重点研发计划项目(2016YFC0501902-06);青海省重大技术专项(2016 NKA701);青海省高端创新人才千人计划培养人才项目;国家自然科学基金-青年项目(31700454);青海省自然科学基金-青年项目(2018-ZJ-939Q)资助

Abstract: This study was aimed to prevent degradation and improve forage-livestock imbalance of alpine grassland,so as to utilize alpine grassland sustainably and improve its productivity. The experiment of rest-grazing in regreen-up period was carried out in winter-spring pastures of Machali Town,Maduo County,Qinghai Province in 2018. A randomized block experiment was adopted and two treatments of grazing and rest-grazing during regreen-up period were set up. We investigated the plant community of degraded grassland in alpine grassland during the end of grazing period (July 10) and the peak period of forage growth (August 10). The results showed that:Compared with the grazing treatment,the plant height,coverage and aboveground biomass of gramineous forage in the rest grazing treatment in July and August significantly increased by 236.33% and 123.83% (P<0.05),41.13% and 61.71% (P<0.05),58.66% and 33.62%,respectively. The main plant species changed from Saussurea arenaria and Sibbaldia procumbens to Stipa purpurea and Stipa penicillata after rest-grazing during the regreen-up period. The plant community structure showed obvious differences between the rest-grazing and grazing treatment. The species richness,Simpson index and Shannon-Wiener index of plant community in rest- grazing grassland were higher than those in grazing grassland. Therefore,the implementation of rest-grazing in regreen-up in alpine grassland improved grassland vegetation restoration,optimized grassland plant community structure and enhanced ecosystem diversity. This experiment can provide scientific theoretical basis for vegetation restoration and grazing rest system of degraded alpine grasslands.

Key words: Rest-grazing in regreen-up period, Alpine steppe, Maduo County, Community characteristics, Biodiversity

摘要: 针对高寒草原冬春草场退化及草畜不平衡问题,为遏制草地生态系统进一步退化、提高草地生产力,本研究于2018年在青海省玛多县玛查理镇冬春草场开展返青期休牧育草试验。试验采用随机区组设计,设置返青期休牧和返青期放牧两个处理,在休牧结束时期和牧草生长高峰期(7月10日和8月10日)分别进行草地植物群落调查。结果表明:相对于放牧草地,7,8月份休牧草地的禾本科牧草株高增加了236.33%和123.83%(P<0.05),盖度增加了41.13%和61.71%(P<0.05),地上总生物量增加58.66%和33.62%;休牧以后草地主要植物种由原来的沙生风毛菊(Saussurea arenaria Maxim)、山莓草(Sibbaldia procumbens Linn.)等变为紫花针茅(Stipa purpurea Griseb)、疏花针茅(Stipa penicillata Hand.-Mazz)等;休牧草地和放牧草地样点植物群落结构存在差异;休牧草地植物群落物种丰富度、辛普森指数、香农-维纳指数较放牧草地均有所增加。因此,返青期休牧在高寒草原的实施改善了草地植被恢复情况,优化了草地植物群落结构,增强了生态系统多样性。本试验可为退化高寒草原植被恢复及休牧制度的实施提供科学理论依据。

关键词: 返青期休牧, 高寒草原, 玛多县, 群落特征, 生物多样性

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