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LIU Min-xia*, LI Wen, LIAN Yi-ming
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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 andTaraxacum mongolicum are two major species of subalpine meadow in Gannan. We analyzed the field spatial distribution and interspecific association ofP. fruticosa and T. mongolicum on different slopes using Ripley’s K (r) function. The results showed that the distribution ofP. fruticosaand T. mongolicumwere 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. mongolicumshowed 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
LIU Min-xia, LI Wen, LIAN Yi-ming. Spatial distribution and association of Potentilla fruticosaand Taraxacum mongolicumbased on Ripley’s K (r) function.[J]. cje.
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URL: http://www.cje.net.cn/EN/abstract/abstract23301.shtml
http://www.cje.net.cn/EN/Y2018/V37/I7/1925