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林业科学 ›› 2006, Vol. 42 ›› Issue (10): 13-18.doi: 10.11707/j.1001-7488.20061003

• 论文及研究报告 • 上一篇    下一篇

磴口县沙冬青种群结构和空间分布格局的研究

何恒斌1 张惠娟2 贾桂霞1   

  1. 1.北京林业大学,北京100083;2.内蒙古巴彦淖尔盟林业局,临河015000
  • 收稿日期:2005-09-27 修回日期:1900-01-01 出版日期:2006-10-25 发布日期:2006-10-25

Population Structure and Spatial Distribution Pattern of Ammopiptanthus mongolicus in Dengkou County,Inner Mongolia Autonomous Region

He Hengbin1,Zhang Huijuan2,Jia Guixia1   

  1. 1.Beijing Forestry University Beijing 100083; 2. Bayannaoer League Forestry Bureau,Inner Mongolia Linhe 015000
  • Received:2005-09-27 Revised:1900-01-01 Online:2006-10-25 Published:2006-10-25

摘要:

对沙冬青的株高和冠幅进行分级,研究磴口县3个沙冬青种群的大小结构和年龄结构,应用扩散系数C、负二次指数K、平均拥挤度m*、丛生指数I、Cassie指数1/K、聚块性指数m*/m和扩散型指数Iδ7种聚集度指标确定不同生境条件下沙冬青种群的空间分布格局类型和动态,考察沙冬青种群在不同尺度上的空间分布格局。结果表明不同生境条件下的沙冬青种群结构有差异,但都呈现衰退趋势。不同生境的沙冬青种群空间分布格局类型和聚集强度不同,聚集强度在不同尺度上表现出基本一致的变化趋势。样地2在25和100m2的范围内集群分布,样地3在150m2范围内集群分布,样地1在7个取样面积下,均成随机分布。不同发育阶段种群的分布格局为幼龄和老龄植株均成随机分布,中龄植株呈聚集分布。环境是沙冬青种群空间分布格局形成和发展的决定因子之一。

关键词: 沙冬青, 种群结构, 空间分布格局, 聚集强度

Abstract:

According to the data,the height and width of Ammopiptanthus mongolicus were classified. The results indicated that the population structures of A. mongolicus were different in different environmental conditions. The age structures of three A. mongolicus populations showed the decline trend. The spatial distribution patterns and pattern dynamics of A. mongolicus populations were studied by applying seven aggregate indices(C,K,m*,I,1/K,m*/m and Iδ ) in different environmental conditions. And the spatial distribution pattern with different quadrat scale was examined. The results indicated that the spatial distribution pattern and aggregation intensity were different in different environmental conditions,while the tendency of pattern aggregation was generally parallel. The figure of pattern scale and pattern intensity showed that plot 2 clumped in 25 and 100 m2,and plot 3 clumped in 150 m2,while plot 1 performed the pattern of random distribution in all quadrat scale. With the population age increased,the distribution pattern had a trend from random to clustering and finally to random. The young and old individuals performed the pattern of random distribution,while the individuals of middle age stage clumped. The environmental factors principally influenced the formation and development of the spatial distribution pattern of A. mongolicus populations.

Key words: Ammopiptanthus mongolicus, population structure, spatial distribution pattern, aggregation intensity