科尔沁沙地植被恢复中差不嘎蒿种群不同龄级个体的点格局分析 |
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作者姓名: | 曹晏宁 史利莎 韩烁 侯安燕 涂凡 张金屯 |
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作者单位: | 北京师范大学生命科学学院, 北京 100875 |
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摘 要: | 差不嘎蒿(Artemisia halodendron)主要分布在呼伦贝尔沙地和科尔沁沙地的流动和半固定沙丘上, 是良好的乡土固沙半灌木, 也是退化沙地固定和植被恢复过程中的建群种。点格局分析方法是20世纪末发展起来的多尺度空间格局分析方法。通过对差不嘎蒿种群的点格局分析, 发现差不嘎蒿幼体的空间格局多为集群分布, 在各个尺度上都极为显著, 而随着差不嘎蒿龄级的增加, 其空间分布也逐渐显现为随机分布。差不嘎蒿相邻龄级的空间关系差异不显著, 而间隔龄级间则呈空间负相关。这与其幼体聚集, 成体随机分布的空间格局相一致。
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关 键 词: | 差不嘎蒿 科尔沁沙地 点格局分析 空间关联 |
收稿时间: | 2007-06-12 |
修稿时间: | 2008-01-17 |
Point Pattern Analysis for a Population of Artemisia halodendron in a Kerqin Sandlot |
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Authors: | Yanning Cao Lisha Shi Shuo Han Anyan Hou Fan Tu Jintun Zhang |
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Institution: | College of Life Sciences, Beijing Normal University, Beijing 100875, China |
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Abstract: | Artemisia halodendron is mainly distributed on shifting or semi- fixed sand dunes in the Hulunbeier and Kerqin Sandlands of Inner Mongolia. It is a semi-shrub and a valuable species for sand fixation. A. halodendron is a constructive species for controlling the shiftings and dunes during vegetation restoration. In this study, we used point pattern analysis, a multivariate spatial-pattern analysis method, to examine the spatial pattern of A. halodendron in relation to ground conditions. Young individuals are generally aggregated at all scales, and older individuals display a tendency for random distribution. Individuals of the neighboring age classes show no apparent spatial association, whereas individuals of disjunct age classes show a negative spatial association. This pattern is consistent with the spatial pattern of clustered distribution of young individuals but random distribution of adults. |
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Keywords: | , |
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