Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (7): 1491-1498.DOI: 10.11733/j.issn.1007-0435.2021.07.015

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Effects of Stubble Height on productivity and Sustainable Utilization in the Stipa grandis Steppe

ZHANG Feng1,2, ZHAO Tian-qi1,2, QIAO Ji-rong1,2, ZHAO Meng-li1,2, ZHANG Xin-yue3, WU Jian-xin4   

  1. 1. College of Grassland, Resource and Environment, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia Autonomous Region 010019, China;
    2. Key Laboratory of Grassland Resources, Ministry of Education of China, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia Autonomous Region 010019, China;
    3. China Construction Second Bureau First Engineering Co., Ltd. Chengdu Branch, Chengdu, Sichuan Province 610000, China;
    4. Inner Mongolia autonomous region of returning farmland to forest and foreign aid project management center, Hohhot, Inner Mongolia Autonomous Region 010020, China
  • Received:2021-02-25 Revised:2021-03-10 Online:2021-07-15 Published:2021-07-31

刈割留茬高度对大针茅草原生产力及可持续利用的影响

张峰1,2, 赵天启1,2, 乔荠瑢1,2, 赵萌莉1,2, 张心玥3, 吴建新4   

  1. 1. 内蒙古农业大学草原与资源环境学院, 内蒙古 呼和浩特 010019;
    2. 内蒙古农业大学草地资源教育部重点实验室, 内蒙古 呼和浩特 010019;
    3. 中建二局第一工程有限公司成都分公司, 四川 成都 610000;
    4. 内蒙古自治区退耕还林和外援项目管理中心, 内蒙古 呼和浩特 010020
  • 通讯作者: 赵萌莉,E-mail:nmgmlzh@126.com
  • 作者简介:张峰(1994-),男,湖北孝感人,博士研究生,主要从事草地生态研究,E-mail:905431228@qq.com
  • 基金资助:
    内蒙古自治区自然科学基金项目（2020ZD03）；内蒙古自治区科技计划项目（2019ZD008）；国家自然科学基金项目（31861143001）资助

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Abstract: We conducted an experiment and set the control (CK) and different mowing treatments (stubble height at 8,5 and 2 cm,respectively) to explore the effects of mowing on grassland productivity and sustainable utilization of typical Stipa grandis steppe. We analyzed aboveground biomass,forage yield and mowing reducing productivity index (MRPI) of communities,grasses and non-grasses at peak of biomass from August 2014-2019, the results showed that: Compared with CK,the aboveground biomass of the community significantly decreased in the 5 cm and 2 cm residue treatments in 2015 (P<0.05),and the community yield in the residue 2 cm treatments was significantly higher than in the residue 5 cm treatments in 2016 (P<0.05);With stubble height decreased,the relative aboveground biomass and relative yield of grasses increased,while that of non-grasses decreased; The MRPI of the community in the residue 2 cm treatment significantly decreased compared with the residue 8 cm treatment,mainly caused by the decrease of MRPI of non-grasses (P<0.05),but the variation coefficient of MRPI of grasses and non-grasses in the residue 2 cm treatment was higher than that of grasses in the residue 5 cm and 8 cm treatment. In summary,in the process of mowing and utilization of grassland,the optimum height of stubble was 8 cm,which was conducive to sustainable utilization of grassland.

Key words: Mowing, Grassland, Forage yield, Mowing reducing productivity index

摘要： 为探讨刈割对大针茅（Stipa grandis）草原生产力及可持续利用的影响，本研究以不刈割为对照（CK），以不同留茬高度8 cm （R8），5 cm （R5），2 cm （R2）为处理，于2014—2019年8月生物量高峰期对草地地上生物量、牧草产量及刈割生产力衰减指数（Mowing reducing productivity index，MRPI）等进行分析，结果表明：2015年，与CK相比，R5和R2的群落地上生物量显著降低（P<0.05），2016年，R2的群落产量显著高于R5（P<0.05）；随着留茬高度逐渐降低，禾草相对地上生物量及相对产量呈增加趋势，而非禾草呈降低趋势。然而，R2的群落MRPI显著低于R8（P<0.05），主要由非禾草的MRPI降低造成，此外，R2的禾草和非禾草MRPI的变异系数高于R5和R8。综上所述，在草地刈割利用过程中，植物群落刈割留茬高度为8 cm时较适宜，有利于草地可持续利用。

关键词: 刈割, 草原, 牧草产量, 刈割生产力衰减指数

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