Acta Agrestia Sinica ›› 2020, Vol. 28 ›› Issue (3): 768-774.DOI: 10.11733/j.issn.1007-0435.2020.03.022

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Effects of Grazing on Biomass Distribution on the Leymus chinensis Meadow Steppe of Hulunbeier

XU Hong-bin1,2, XIN Xiao-pin1, BAOYIN-Taogetao2, YAN Rui-rui1, WANG Xu1, CHEN Bao-rui1, JIN Dong-yan1, YAO Jing1, LIU Zhi-ying2   

  1. 1. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Hulunbeir Grassland Ecosystem Research Station, Beijing 100081, China;
    2. College of Ecology and Environment, Inner Mongolia University, Hohhot, Inner Mongolia 010021, China
  • Received:2019-11-20 Revised:2020-02-03 Online:2020-06-15 Published:2020-05-30

放牧对呼伦贝尔羊草草甸草原生物量分布的影响

许宏斌1,2, 辛晓平1, 宝音陶格涛2, 闫瑞瑞1, 王旭1, 陈宝瑞1, 金东艳1, 姚静1, 刘志英2   

  1. 1. 中国农业科学院农业资源与农业区划研究所/呼伦贝尔草原生态系统国家野外科学观测研究站, 北京 100081;
    2. 内蒙古大学生态与环境学院, 内蒙古 呼和浩特 010021
  • 通讯作者: 闫瑞瑞
  • 作者简介:许宏斌(1991-),男,内蒙古凉城人,博士研究生,主要从事草地生态方面的研究,E-mail:xhb1686@163.com
  • 基金资助:
    国家重点研发计划项目(2016YFC0500608,2016YFC0500601,2016YFC0500603);国家重点研发计划—中美政府间合作项目(2017YFE0104500);中央级公益性科研院所基本科研业务费专项(1610132018009,1610132019031);国家自然科学青年基金(41801096);现代农业产业技术体系建设专项资金(CARS-34);呼伦贝尔科技计划项目(YYYFHZ201903)共同资助

Abstract: This study was conducted in a meadow dominated by Leymus chinensis (Hulunbeir Grassland Ecosystem Research Station) during two consecutive years. To assess the impact of grazing intensity on plant aboveground biomass,belowground biomass and their distribution pattern,plant biomass of aboveground and belowground were measured under no grazing,light grazing,moderate grazing and heavy grazing,respectively. The results showed that the total aboveground biomass decreased when grazing intensity was increased,with the biomass of 238.14 g·m-2 without grazing and 79.60 g·m-2 under heavy grazing. However,the proportion of the biomass of forb was significantly increased when grazing intensity was increased,ranging from no grazing 35.93% to heavy grazing 97.66%. Total belowground biomass tended to decrease first and then increase along the grazing gradient under the moderate grazing. Furthermore,more belowground biomass was distributed to the topsoil,61.86% and 64.43% of total belowground biomass were distributed to 0~10 cm layer soil in 2013 and 2014,respectively,with the highest under light grazing. In general,grazing causes changes in the aboveground and underground biomass distribution of plant communities,and it is more reasonable to use the grassland with light or moderate grazing in this area.

Key words: Grazing intensity, Meadow grassland, Biomass distribution

摘要: 本研究以羊草(Leymus chinensis)草甸草原(基于呼伦贝尔草原生态系统国家野外科学观测研究站)为研究对象,通过测算2013年和2014年植物群落地上和地下生物量在不同放牧强度(不放牧、轻度放牧、中度放牧、重度放牧)下的变化,探究不同放牧强度对植物群落地上、地下生物量分布的影响。研究结果显示,群落地上生物量随放牧强度增加而减少,从不放牧的238.14 g·m-2减少至重度放牧的79.60 g·m-2;杂类草地上生物量所占比例增加,由不放牧的35.93%增加至重度放牧的97.66%。群落地下生物量随放牧强度增加呈先降低后增加的趋势,中度放牧时最小(2013年733.25 g·m-2、2014年682.99 g·m-2);轻度放牧下,群落地下生物量在0~10 cm土层分布比例最大,2013年为61.86%,2014年为64.43%。综上可得出,放牧会引起植物群落地上、地下生物量分布发生变化,轻度或中度放牧利用该区域草地比较合理。

关键词: 放牧强度, 草甸草原, 生物量分布

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