高原鼢鼠干扰对高寒草甸植物群落特征的影响

doi:10.11686/cyxb2019416

摘要/Abstract

摘要： 高原鼢鼠的采食造丘活动影响草地植被群落组成和结构,造成草地植被的空间异质性——土丘和植被斑块。本研究以冬季牧场中不同高原鼢鼠种群密度干扰下的植被性状为研究对象,探索植被群落组成结构对高原鼢鼠不同种群密度干扰的功能性响应。结果表明:植被高度随着鼢鼠种群密度的增加呈显著增加趋势(P<0.05),群落盖度和禾草丰富度呈显著下降趋势(P<0.05),而物种丰富度及杂类草丰富度随鼢鼠种群密度的增加表现出单峰曲线格局。地下总生物量随鼢鼠种群密度的增加呈显著下降趋势(P<0.05),杂类草生物量则表现出相反的趋势,而禾草类生物量表现出先降低后增加的趋势。由此可见,适宜密度的鼢鼠干扰有利于物种丰富度的提高,而低密度和高密度的鼢鼠干扰有利于草地中禾草生物量的提高。

关键词: 高原鼢鼠, 物种丰富度, 功能群丰富度, 植物生物量

Abstract: The excavation activities of plateau zokor can affect the grassland plant community composition and structure, resulting in spatial heterogeneity, namely the mounds and undisturbed vegetation patches. In this study, the vegetation characteristics and disturbance effects of different plateau zokor densities in winter pasture were evaluated, and the functional response of community composition and structure were assessed. With increased zokor population density, vegetation height increased significantly (P<0.05), the plant community cover and grass functional group species richness decreased (P<0.05), and the species richness and the forb richness initially increased and then decreased. Within increasing plateau zokor disturbance levels, the total underground biomass decreased (P<0.05), the biomass of the forbs increased (P<0.05), and the grass biomass initially decreased and then increased. These results indicate that moderate disturbance by plateau zokor enhances plant community species richness, while at low or high zokor density and disturbance, grass biomass is improved.

Key words: plateau zokor, species richness, plant functional group richness, plant biomass

杨子翰, 陈泰祥, 郑巧燕, 卫万荣. 高原鼢鼠干扰对高寒草甸植物群落特征的影响[J]. 草业学报, 2020, 29(5): 13-20.

YANG Zi-han, CHEN Tai-xiang, ZHENG Qiao-yan, WEI Wan-rong. Effects of the excavation activities of plateau zokor (Myospalax baileyi) on the plant community characteristics of alpine meadow[J]. Acta Prataculturae Sinica, 2020, 29(5): 13-20.

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