Acta Agrestia Sinica ›› 2018, Vol. 26 ›› Issue (1): 92-98.DOI: 10.11733/j.issn.1007-0435.2018.01.011

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Effects of Stubble Height on Characteristics of Stipa grandis Populations in Typical Steppe

WANG Xi, JIA Li-xin, QIAO Ji-rong, YANG Yang, ZHANG Feng, ZHAO Meng-Li   

  1. College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China
  • Received:2017-05-12 Revised:2018-01-15 Online:2018-02-15 Published:2018-05-25

留茬高度对典型草原大针茅种群特征影响的研究

王玺, 贾丽欣, 乔荠蓉, 杨阳, 张峰, 赵萌莉   

  1. 内蒙古农业大学草原与资源环境学院, 内蒙古 呼和浩特 010018
  • 通讯作者: 赵萌莉
  • 作者简介:王玺(1992-),女,汉族,山西临汾人,硕士,E-mail:384464398@qq.com
  • 基金资助:

    内蒙古温性草原牧区"生产生态生活"优化保障技术集成与示范(2012BAD13B02);牧区优质高效饲草生产利用技术研究示范项目(201003023)资助

Abstract:

This study was conducted in Maodeng rangeland, Xilingol League, Inner Mongolia. The experiment was designed as a randomized block with three replicates. The treatments included different stubbed heights, 2 cm, 5 cm, 8 cm and the un-mowed (control CK). The population characteristics of Stipa grandis, such as the height, coverage, density, number of branches, each branch leaf number and aboveground biomass were analyzed. The results showed that, the height, coverage and density of S. grandis were significantly different in four treatments(P<0.05), and all reached the maximum with the treatment of 5 cm-stubbed height. The S. grandis’s aboveground biomass showed positively correlation with plant height and the number of branches (r2=0.3605、P<0.0001;r2=0.6325、P<0.0001). The density was positively related to coverage(r2=0.5445、P<0.0001), while negatively correlated with each branch leaf number(r2=0.3801、P<0.05).

Key words: Stubble height, Typical steppe, Stipa grandis, Population characteristics

摘要:

本研究选在锡林郭勒盟毛登牧场,通过设置3个留茬高度与不刈割对照处理,3次重复进行随机区组试验。对大针茅(Stipa grandis)的高度、盖度、密度、分枝数、每枝叶片数及地上生物量等种群特征进行研究。结果表明:大针茅种群的高度、盖度、密度及地上生物量在4种处理下均表现出显著的差异性(P<0.05),且都在留茬5 cm处理时达到最大;大针茅种群的地上生物量与植株的高度和分枝数之间具有极显著的正相关关系(r2=0.3605、P<0.0001;r2=0.6325、P<0.0001);大针茅种群的密度与盖度之间具有极显著的正相关关系(r2=0.5445、P<0.0001),与每枝的叶片数之间具有显著的负相关关系(r2=0.3801、P<0.05)。

关键词: 留茬高度, 典型草原, 大针茅, 种群特征

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