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Point pattern analysis on Potentilla fruticosa population along altitudinal gradient in Qilian Mountains

Point pattern analysis on Potentilla fruticosa population al...

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生态文明建设中的植物学：现在与未来——中国植物学会第十五届会员代表大会暨八十周年学术年会

作者： Guangping Xu Zhengqiang Qiu Chengxin He Daxing Gu Denan Zhang Yuqing Huang Guangxi Institute of Botany Guangxi Zhuang Autonomous Region and the Chinese Academy of Sciences Hebei Institute of Architecture Civil Engineering

Potentilla fruticosa was sampled from Qilian Mountains, Qinghai province at altitudes of 2430m, 2990 m and 3522m respectively for investigation of its spatial distribution pattern. Here we employed the technique of point pattern analysis which could analyze patterns under all scale along a gradient. The results showed that the population density decreased remarkably with increasing elevation, the ratio of root to shoot at 2430 m was significantly higher than that at 3522 m .The middle aged were the most, young ones were letter, and the old were the least in the population from the whole aspect. The populations of Potentilla fruticosa was randomly distributed at the small spatial scales, and was clumped at the most spatial scales which ranged from 0. 1 m to 7.5m .With the altitude elevation, the scale of the clumping distribution tends to decrease. The findings suggested that the spatial distribution patterns of Potentilla fruticosa at different altitudinal depended on their biological characteristics at small scale, but on the environmental heterogeneity at larger scales. The shift of balance between competition and facilitation among neighboring individual, might be partially responsible to the observed patterns. The spatial variations o f distribution pattern reflected the competition between different species and the trends of succession of plant community.

关键词： Point pattern analysis ripley k function Altitudinal gradient Qilian Mountains.

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