Heavy Grazing Led to the Decrease of Competitive Intensity Relationships Among Dominant Populations of Clustered Grasses in Desert Steppe

doi:10.11733/j.issn.1007-0435.2024.09.016

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (9): 2824-2832.DOI: 10.11733/j.issn.1007-0435.2024.09.016

Heavy Grazing Led to the Decrease of Competitive Intensity Relationships Among Dominant Populations of Clustered Grasses in Desert Steppe

WANG Zi-han¹, LYU Shi-jie², LIU Hong-mei³, LI Zhi-guo¹, WANG Zhong-wu¹, HAN Guo-dong¹

1 College of Grassland Science, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China;
2 Science College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010200, China;
3 Forestry Research Institute of Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia 010010, China

Received:2024-02-13 Revised:2024-04-03 Published:2024-10-09

重度放牧导致荒漠草原丛生禾草优势种群种间竞争强度下降

王梓晗¹, 吕世杰², 刘红梅³, 李治国¹, 王忠武¹, 韩国栋¹

1. 内蒙古农业大学草业学院, 内蒙古呼和浩特 010010;
2. 内蒙古农业大学理学院, 内蒙古呼和浩特 010010;
3. 内蒙古自治区林业科学研究院, 内蒙古呼和浩特 010010

通讯作者: 王忠武,E-mail:wangzhongwu@imau.edu.cn
作者简介:王梓晗(1998-),女,汉族,河北保定人,博士研究生,主要从事草地资源生态与管理研究,E-mail:530919415@qq.com
基金资助:
内蒙古农业大学交叉学科基金项目(BR22-14-04);国家自然科学基金(31760143，32260352);内蒙古重大科技专项(2021ZD0044);内蒙古自治区自然科学基金项目(2021MS03042)资助

Abstract

Abstract: Exploring the changes of interspecific relationship between the dominant species of Stipa breviflora and Cleistogenes songorica in desert steppe during grazing has important guiding significance for its regulation of plant community structure and function. In this study,S. breviflora and C. songorica were used as the research objects in desert steppe,Variance analysis,Jaccard index and linear regression model analysis were used to explore the density changes of S. breviflora and C. songorica and their interspecific competition relationship under different grazing intensities and spatial scales. The results showed that the densities of S. breviflora and C. songorica were significantly different with the increase of grazing intensity and spatial scale (P < 0.05). The increase of grazing intensity and spatial scale increased the density of S. breviflora and C. songorica,and the density had a stronger response to spatial scale. With the increase of grazing intensity,the competitive ability of S. breviflora and C. songorica increased first and then decreased. Under heavy grazing conditions,the dominant populations of clustered grasses resisted the interference of high-intensity grazing by reducing the intensity of interspecific competition (increasing interspecific affinity). Therefore,grazing intensity changed the interspecific relationship of dominant species from competitive relationship to affinity relationship.

Key words: Grazing intensity, Inter-specific relationship, Jaccard index, Desert steppe, Dominant population

摘要： 探究荒漠草原的优势种短花针茅和无芒隐子草在放牧过程中种间关系的变化，对于丛生禾草优势种群调控植物群落结构和功能具有重要指导意义。本文以荒漠草原的短花针茅(S.breviflora)和无芒隐子草(C. songorica)为研究对象，采用了方差分析和Jaccard指数以及线性回归模型分析方法，探究在不同放牧强度和空间尺度下短花针茅和无芒隐子草的密度变化及其二者的种间竞争关系。结果表明：伴随放牧强度和空间尺度的增加，短花针茅和无芒隐子草的密度均存在显著性差异(P<0.05)。放牧强度和空间尺度增加均增大了短花针茅和无芒隐子草密度，且该密度对空间尺度的响应更强。伴随放牧强度增加，短花针茅和无芒隐子草的竞争能力先增强后减弱，丛生禾草优势种群通过降低种间竞争强度(增加种间亲和性)来抵御重度放牧条件下的干扰。因此，放牧会使得优势种的种间关系由竞争关系转变为亲和关系。

关键词: 放牧强度, 种间关系, Jaccard指数, 荒漠草原, 优势种群

CLC Number:

S812

WANG Zi-han, LYU Shi-jie, LIU Hong-mei, LI Zhi-guo, WANG Zhong-wu, HAN Guo-dong. Heavy Grazing Led to the Decrease of Competitive Intensity Relationships Among Dominant Populations of Clustered Grasses in Desert Steppe[J]. Acta Agrestia Sinica, 2024, 32(9): 2824-2832.

王梓晗, 吕世杰, 刘红梅, 李治国, 王忠武, 韩国栋. 重度放牧导致荒漠草原丛生禾草优势种群种间竞争强度下降[J]. 草地学报, 2024, 32(9): 2824-2832.

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Heavy Grazing Led to the Decrease of Competitive Intensity Relationships Among Dominant Populations of Clustered Grasses in Desert Steppe

重度放牧导致荒漠草原丛生禾草优势种群种间竞争强度下降

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