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当前位置: 首页 > 文章 > 甘南亚高寒草甸坡向梯度上矮嵩草与珠芽蓼种群点格局及其关联性 生态学杂志 2017 (10) 2685-2691
Position: Home > Articles > Spatial distribution pattern and association of Kobresia humilis and Polygonum vivipurum under different slope aspects in a subalpine meadow of Gannan Chinese Journal of Ecology 2017 (10) 2685-2691

甘南亚高寒草甸坡向梯度上矮嵩草与珠芽蓼种群点格局及其关联性

作  者：
刘旻霞;李俐蓉;车应弟;肖卫;焦娇
单  位：
西北师范大学地理与环境科学学院
关键词：
亚高寒草甸;坡向;矮嵩草;珠芽蓼;空间分布格局;空间关联
摘  要：
种群的空间分布格局及关联性可以反映种群演替方式和环境因子改变的适应策略。矮嵩草(Kobresia humilis)与珠芽蓼(Polygonum vivipurum)是甘南亚高寒草甸的主要物种,通过野外群落调查,运用Ripley K函数,分析了不同坡向的矮嵩草与珠芽蓼种群的空间分布格局及种间关联性。结果表明:矮嵩草和珠芽蓼在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,矮嵩草种群的株数、盖度及生物量不断增加,而珠芽蓼种群则不断减少;在北坡,矮嵩草种群在0~2.2 m呈现出聚集分布,随着尺度的增加聚集强度减弱并趋向于随机分布,珠芽蓼种群均以聚集分布为主;在西坡,矮嵩草与珠芽蓼种群在0~0.8 m范围呈聚集分布,在2.3 m以上范围内趋向于随机分布;在南坡,矮嵩草与珠芽蓼分布格局在研究尺度内均表现出随机分布;在北坡,这两种物种在0~1 m范围内表现为正相关,西坡为种间在0~1.3 m范围内负关联;随着尺度的增加种间关联度在这两个坡向上均趋向于不相关,而这两个物种在南坡也表现出不相关;矮嵩草和珠芽蓼种群空间格局及关联性有助于我们认识亚高寒草甸种群的种内与种间竞争过程、多样的生态策略及群落演替趋势。
译  名：
Spatial distribution pattern and association of Kobresia humilis and Polygonum vivipurum under different slope aspects in a subalpine meadow of Gannan
作  者：
LIU Min-xia;LI Li-rong;CHE Ying-di;XIAO Wei;JIAO Jiao;College of Geography and Environmental Science,Northwest Normal University;
关键词：
subalpine meadow;;slope aspect;;Kobresia humilis;;Polygonum vivipurum;;spatial distribution pattern;;spatial association
摘  要：
The spatial distribution and correlation of population can reflect the adaptation strategy under the conditions of population succession and environmental change.Kobresia humilis and Polygonum vivipurum are the main species in the subalpine meadow of Gannan.Through field community investigation and by using Ripley's K function,the distribution pattern and interspecific association of K.humilis and P.vivipurum on different slopes(northerly,westerly,and southerly) were analyzed.The results showed that the distribution of K.humilis and P.viviparum showed a significant difference on the three slopes.The number,coverage and biomass of K.humilis showed an increasing trend,and the P.viviparum showed a decreasing trend from northerly to westerly to southerly slope.On northerly slope,the population of K.humilis showed an aggregated distribution at 0-2.2 m scale,and the aggregation intensity decreased and tended to randomly distribute with the increase of scale;P.viviparum was in aggregated distribution.On westerly slope,K.humilis and P.vivipurum showed aggregated distribution at 0-0.8 m scale,and random distribution at > 2.3 m scale.The distribution pattern of K.humilis and P.vivipurum showed a random distribution on southerly slope.The two species showed a positive correlation at 0-1 m scale on northerly slope,and a negative correlation at 0-1.3 m scale on westerly slope.Interspecific associations tended to be uncorrelated with increasing scales on these two slopes,and these two species also showed no correlation on southerly slope.The spatial patterns and associations of K.humilis and P.vivipurum are helpful for us to understand the intraspecific and interspecific competition processes,the diversity of ecological strategies and the community succession trend in the subalpine meadow.

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