黄土高原中部红砂与荒漠锦鸡儿种群空间分布格局及关联性  

Spatial distribution pattern and association of Reaumuria songarica and Caragana roborovskyi in central Loess Plateau

作　　者：南笑宁 刘旻霞[1] 朱恭[2] 夏素娟 李全弟 蒋晓轩 NAN Xiao-ning;LIU Min-xia;ZHU Gong;XIA Su- juan;LI Quan-di;JIANG Xiao-xuan(College of Geography and Environmental Science, Northu,est Normal Unirersity,Lanzhou 730070,China;Environmental Greening Project Headquarters of South and North Mountain in Lanzhou City,Lanzhou 730046,China)

机构地区：[1]西北师范大学地理与环境科学学院,兰州730070 [2]兰州市南北两山环境绿化工程指挥部,兰州730046

出　　处：《生态学杂志》2019年第2期354-360,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31360114;31760135)资助

摘　　要：植物种群的空间分布格局与关联性是研究植物种群之间相互作用及种群与环境关系的重要手段。以甘肃省皋兰县老虎台干旱荒漠区的主要物种——红砂(Reaumuria songarica (Pall.) Maxim.)与荒漠锦鸡儿(Caragana roborovskyi Kom.)为对象,采用Ripley K函数分析了不同坡向红砂和荒漠锦鸡儿种群的点格局特征及其关联性,以揭示干旱荒漠区植被演替过程中优势种群之间的竞争关系和生存繁衍策略。结果表明:红砂与荒漠锦鸡儿种群在3个坡向上的分布具有显著差异,随着坡向由西北坡向西南坡的转变,红砂种群的株数与盖度不断减少,而荒漠锦鸡儿种群则不断增加。在西北坡,红砂种群在0～5 m范围内表现为随机分布,而荒漠锦鸡儿种群以聚集分布为主;在西坡,红砂与荒漠锦鸡儿种群均呈随机分布;在西南坡,红砂种群在0～5 m范围内呈聚集分布,而荒漠锦鸡儿种群呈随机分布。西北坡的红砂与荒漠锦鸡儿在研究尺度内呈负相关;两种物种在西坡0～5 m内无关联;在西南坡,红砂和荒漠锦鸡儿种群在0～1.3 m范围内为负关联,在1.3～5 m范围内则为无关联。研究结果有助于我们认识本地区植物的种内与种间竞争过程、多样化的生态策略及群落演替趋势。Spatial distribution pattern and association of plant populations are important means to understand the interaction of plant populations and the relationship between plant populations and environment. In this study,the spatial distribution characteristics and the association of Reaumuria songarica( Pall.) Maxim. and Caragana roborovskyi Kom.,two main species on different slopes in Laohutai arid desert area of Gaolan County,Gansu Province,were analyzed by using Ripley’s K function,aiming to reveal the changes of competition relationship,survival,and reproduction strategies of dominant populations during vegetation succession in the arid desert area. The results showed that the distribution of R. songarica and C. roborovskyi significantly differed in three slope aspects. The number of individuals and coverage of R. songarica showed a decreasing trend,while the C. roborovskyi showed an increasing trend from northwest to southwest slope. On the northwest slope,R. songarica showed a random distribution at 0-5 m scale,while C. roborovskyi was in aggregated distribution. On the west slope,both R. songarica and C.roborovskyi showed random distribution at all scales. On the southwest slope,R. songarica showed an aggregated distribution at 0-5 m scale,while C. roborovskyi showed a random distribution. R.songarica and C. roborovskyi showed a negative correlation at various scales on the northwest slope. Both species showed no association at 0-5 m scale on the west slope. On the southwest slope,R. songarica and C. roborovskyi showed a negative association at 0-1.3 m scale,and had no association at 1.3-5 m scale. Our results were helpful to the understanding of the intraspecific and interspecific competition,diverse ecological strategies of plant species,and community succession in the study region.

关 键 词：黄土高原 坡向 红砂 荒漠锦鸡儿 空间分布格局 

分 类 号：Q948[生物学—植物学]