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基于Ripley-K(r)函数的金露梅与蒲公英种群空间分布格局及其关联性

刘旻霞*,李文,连依明   

  1. (西北师范大学地理与环境科学学院, 兰州 730070)
  • 出版日期:2018-07-10 发布日期:2018-07-10

Spatial distribution and association of Potentilla fruticosaand Taraxacum mongolicumbased on Ripley’s K (r) function.

LIU Min-xia*, LI Wen, LIAN Yi-ming   

  1. (College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China).
  • Online:2018-07-10 Published:2018-07-10

摘要: 物种空间分布格局和种间关联性是研究种群特征、种间相互影响以及物种同环境关系的重要方法。金露梅(Potentilla fruticosaL.)与蒲公英(Taraxacum mongolicum Hand.Mazz.)是甘南亚高寒草甸的主要物种,通过野外群落调查,应用点格局方法中的Ripley-K函数,分析不同坡向的金露梅与蒲公英种群的空间分布格局及种间关联性。结果表明:金露梅与蒲公英在3个坡向上的分布具有明显差异,随着坡向由北坡向南坡的转变,金露梅种群呈现递减趋势,蒲公英种群则呈现出递增趋势;在北坡,金露梅在0~4.8 m内呈现聚集分布且聚集程度比较高,在4.8~5 m呈现随机分布;在西坡,金露梅在0~0.6 m尺度内表现出随机分布,在0.6~1.6 m尺度内为聚集分布,在1.6~5 m尺度内则又再次呈现随机分布;而在南坡,金露梅在整个研究尺度范围内均呈现随机分布;北坡的蒲公英在0~2.8 m尺度上呈现聚集分布,在2.8~5 m内呈现随机分布;西坡和南坡上蒲公英在整个研究尺度内都呈现随机分布;北坡的金露梅与蒲公英在整个研究尺度内呈现负关联,西坡两种群在整个尺度内呈现无关联;南坡的金露梅与蒲公英在0~2.4 m尺度内呈现无关联,在2.4~5 m尺度内呈现负关联。

关键词: 概率分布, 捕捞强度, 南海北部, 资源密度

Abstract: The analysis of spatial distribution and association of species is an important method to study population characteristics, interspecific interaction, species and environmental relationship. Potentilla fruticosa andTaraxacum mongolicum are two major species of subalpine meadow in Gannan. We analyzed the field spatial distribution and interspecific association ofP. fruticosa and T. mongolicum on different slopes using Ripley’s K (r) function. The results showed that the distribution ofP. fruticosaand T. mongolicumwere obviously different in three slope aspects. P. fruticosa population showed a decreasing trend, while T. mongolicum population showed an increasing trend from north to south aspect. On the north aspect, P. fruticosa showed a relatively high degree of aggregation at 0-4.8 m scale and a random distribution at 4.8-5 m scale. On the west aspect, P. fruticosa showed a random distribution at 0-0.6 m scale, aggregate distribution at 0.6-1.6 m scale, and random distribution again at 1.6-5 m scale. On the south aspect, P. fruticosa showed a random distribution throughout the study scales. T. mongolicum showed aggregation distribution at 0-2.8 m scale, random distribution at 2.8-5 m scale on the north aspect, and a random distribution at the whole study scales on the west aspect and south aspect. P. fruticosa and T. mongolicum showed a negative correlation at any scale on north aspect. Both species had no association at the whole study scales on the west aspect. On the south aspect,P. fruticosa and T. mongolicumshowed no correlation at 0-2.4 m scale, and a negative correlation at 2.4-5 m scale.

Key words: probability distribution, stock density, fishing effort., northern South China Sea