禁牧对西藏亏祖山温性草原主要植物生态位及种间联结的影响
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1.西藏大学生态环境学院;2.拉萨市第一中等职业技术学校

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Q948.1

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西藏大学2022年国家级大学生创新训练计划项目(202210694005)


Analysis of Niche and Interspecific Association of Dominant Plant Species in Temperate grasslands of Kuizu Mountain in Tibet under Enclosure
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    摘要:

    该研究采用“Levins”方法、方差比率法(VR)、卡方检验、联结系数association coefficient(AC)和Ochiai(OI)指数,对西藏亏祖山温性草原优势植物群落中的8个主要植物物种进行分析,以揭示禁牧处理对亏祖山温性草原优势植物群落中主要植物植物物种的生态位和种间联结的影响,为青藏高原温性草原植物多样性保护和科学管理提供理论依据。结果表明:(1)禁牧增加了草沙蚕(Tripogon bromoides)、高山嵩草(Carex parvula)、白草(Pennisetum flaccidum)和丝颖针茅(Stipa capillacea)的生态位宽度和生态位重叠值。(2)研究区内禁牧处理的群落总体表现为负关联(VR=0.43),自然放牧群落总体表现为正关联(VR=1.21);2检验表明8个优势物种所组成的28个种对在禁牧和自然放牧处理下,分别有50%和42.9%的种对表现出负联结性;联结系数AC值表明,禁牧和自然放牧处理下分别有50%和42.9%的种对均呈负联结;OI指数表明,禁牧使得优势种(草沙蚕、高山嵩草、白草和丝颖针茅)之间的OI指数增大。研究认为,禁牧使亏祖山温性草原优势植物群落内种间竞争加强,种间关系变紧密,群落结构趋于稳定。

    Abstract:

    Abstract: In this study, the "Levins" method, variance ratio method (VR), chi-square test, association coefficient (AC) and Ochiai (OI) index were used to analyze eight major plant species in the dominant plant communities in the temperate grasslands of the Kuizu Mountains of Tibet, in order to reveal the effects of non-grazing restriction on the ecological niches and interspecific associations of the herbaceous species in the dominant plant communities in the temperate grasslands of the Kuizu Mountains of Linzhou County, Lhasa River Basin, so as to provide theoretical basis for the protection of the plant diversity of the temperate grasslands of the Tibetan Plateau and for the scientific management of the grasslands.The results showed that : (1)non-grazing treatments increased the niche width and niche overlap of grass sedge (Tripogon bromoides), alpine tarragon (Carex parvula), whitegrass (Pennisetum flaccidum), and silky needle fescue (Stipa capillacea).(2) The enclosure community in the study area showed an overall negative association (VR=0.43), and the free-grazing community showed an overall positive association (VR=1.21);According to the Chi square test, the 50% and 42.9% of the 28 species pairs composed of 8 dominant species displayed negative association under the non-grazing and free grazing treatments;The association coefficient showed that 50% and 42.9% of species pairs were negatively linked under the non-grazing and free grazing treatments;respectively. The OI index showed that non-grazing treatments increased the OI values of the main species(Tripogon bromoides, Carex parvula, Pennisetum flaccidum and Stipa capillacea). Based on the interspecific association analysis, non-grazing treatments has strengthened inter-species competition within the dominant plant communities in the temperate grasslands of Kuizu Mountains, and inter-species relationships have become tighter, with the community structure stabilized.

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杨金涛,张晓晗,尹正辉,等.禁牧对西藏亏祖山温性草原主要植物生态位及种间联结的影响[J].西北植物学报,2024,44(2):330-337

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历史
  • 收稿日期:2023-05-18
  • 最后修改日期:2023-10-31
  • 录用日期:2023-11-02
  • 在线发布日期: 2024-01-25
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