Effects of Grazing Intensity on Biomass Allocation Patterns of Six Plant Species in a Typical Grassland

doi:10.11733/j.issn.1007-0435.2021.01.018

Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (1): 149-155.DOI: 10.11733/j.issn.1007-0435.2021.01.018

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Effects of Grazing Intensity on Biomass Allocation Patterns of Six Plant Species in a Typical Grassland

ZHANG Zi-wei, GAO Bin, LIN Chang-cun, WANG Qing, LIU Jia-le, YANG Na, SU De-rong, PING Xiao-yan

Research Center for Grassland Ecology and Resources, School of Grassland Science, Beijing Forestry University, Beijing 100083, China

Received:2020-07-21 Revised:2020-09-09 Published:2021-01-08

放牧强度对典型草原6个物种生物量分配格局的影响

张紫薇, 高斌, 林长存, 王青, 刘佳乐, 杨娜, 苏德荣, 平晓燕

北京林业大学草业与草原学院, 草地资源与生态研究中心, 北京 100083

通讯作者: 平晓燕
作者简介:张紫薇(1997-),女,河北保定人,硕士研究生,主要从事草地资源与生态研究,Email:randol9285@163.com
基金资助:
国家自然科学基金项目（31700388）；北京林业大学自由探索项目（2019ZY10）资助

Abstract

Abstract: This study focused on biomass allocation patterns of six plant species (Iris lactea,Artemisia subulata,Cleistogenes squarrosa,Potentilla bifurca,A. giraldii and Leymus chinensis) in response to grazing intensity in a typical grassland of Bashang region in Hebei Province. Six plant species were dominant or subdominant species of communities. The results showed that total biomass and aboveground biomass of six plant species significantly decreased with increasing grazing intensity，while belowground biomass showed different tendencies among six plant species. Compared with the control (without grazing),the belowground biomass of C. squarrosa significantly increased under heavy grazing density,and the belowground biomass of P. bifurca significantly increased under moderate grazing density. The root:shoot ratio (R/S ratio) increased significantly with increasing grazing intensity. Moreover,R/S ratio was significantly different among six plant species. The belowground biomass of individual plant varied largely among six plant species. There was significant negative correlation between important value and R/S ratio for L. chinensis,but the correlations were significant positive for the other five plant species. Our results confirmed that plant species adjusted their biomass allocation patterns in response to grazing disturbance,and our results were beneficial for understanding the formation mechanism of plant community composition in degraded grazing grassland.

Key words: Grazing intensity, Biomass allocation pattern, Typical grassland, Leymus chinensis

摘要： 本研究选取河北坝上地区为研究区域，以不同放牧强度样地的群落优势种或亚优势种（马蔺（Iris lactea）、线叶蒿（Artemisia subulata）、糙隐子草（Cleistogenes squarrosa）、二裂委陵菜（Potentilla bifurca）、华北米蒿（A.giraldii）和羊草（Leymus chinensis））为研究对象，分析放牧强度对6个物种生物量分配格局的影响。结果表明：随放牧强度的增加，6个物种的单株总生物量和单株地上生物量均显著降低，单株地下生物量随放牧强度呈现不同的规律；与对照相比，重度放牧显著提高了糙隐子草的单株地下生物量，中度放牧则显著提高了二裂委陵菜的单株地下生物量；根冠比随放牧强度显著增加，且不同物种之间也呈现显著差异；羊草在群落中的重要值与根冠比呈显著负相关，其他5个物种的根冠比与其重要值呈显著正相关。本研究证实物种会通过调整其生物量分配格局来适应放牧干扰，研究结果有助于深入理解放牧退化草原群落物种组成的形成机制。

关键词: 放牧强度, 生物量分配格局, 典型草原, 羊草

CLC Number:

ZHANG Zi-wei, GAO Bin, LIN Chang-cun, WANG Qing, LIU Jia-le, YANG Na, SU De-rong, PING Xiao-yan. Effects of Grazing Intensity on Biomass Allocation Patterns of Six Plant Species in a Typical Grassland[J]. Acta Agrestia Sinica, 2021, 29(1): 149-155.

张紫薇, 高斌, 林长存, 王青, 刘佳乐, 杨娜, 苏德荣, 平晓燕. 放牧强度对典型草原6个物种生物量分配格局的影响[J]. 草地学报, 2021, 29(1): 149-155.

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Effects of Grazing Intensity on Biomass Allocation Patterns of Six Plant Species in a Typical Grassland

放牧强度对典型草原6个物种生物量分配格局的影响

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