毛乌素沙地固定沙丘黑沙蒿灌丛空间点格局  

Spatial point pattern of Artemisia ordosica shrubland on fixed sand dunes in the Mu Us Sandy Land,China

作　　者：唐如韵 张定海[1] 赵有益[1] 单立山[2] 杨青惠 杨甜 李佳乐 黄文琪 TANG Ruyun;ZHANG Dinghai;ZHAO Youyi;SHAN Lishan;YANG Qinghui;YANG Tian;LI Jiale;HUANG Wenqi(Center for Quantitative Biology,College of Science,Gansu Agricultural University,Lanzhou 730070,China;College of Forestry,Gansu Agricultural University,Lanzhou 730070,China)

机构地区：[1]甘肃农业大学理学院数量生物研究所,兰州730070 [2]甘肃农业大学林学院,兰州730070

出　　处：《应用生态学报》2025年第3期719-728,共10页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(42361016);甘肃农业大学青年导师扶持基金项目(GAU-QDFC-2023-07);甘肃省科技厅重点研发计划-农业领域项目(23YFNA0036);甘肃省科技创新计划-“西部之光”人才计划项目(22JR9KA032)资助。

摘　　要：为研究固沙灌木空间点格局的影响机制,选取毛乌素沙地中主要优势固沙灌木黑沙蒿以及与其共生的固沙灌木蒙古羊柴、拧条锦鸡儿和细枝羊柴为研究对象,采用成对相关函数g(r)和不同零模型对黑沙蒿及其不同生长阶段的个体以及3种共生固沙灌木种群进行空间分布格局和空间关联性研究。结果表明:在种子扩散限制的作用下,黑沙蒿及3种共生固沙灌木基本呈现小尺度上聚集、大尺度上随机的空间分布格局;黑沙蒿种群内关联性以正关联和无关联为主,其主要受到种子扩散限制的影响;在剔除生境异质性的情形下,黑沙蒿与蒙古羊柴、拧条锦鸡儿之间的种间关联性呈现小尺度(0~4和0~2 m)上正关联、中等和较大尺度(3~20和2~11、13~20 m)上无关联的特征。黑沙蒿与细枝羊柴在中小尺度(0~13 m)上无关联,在大尺度(13~20 m)上存在负关联。不同生长阶段中,黑沙蒿幼株与3个共生灌木的空间关联最弱,营养株和生殖株与共生灌木的空间关联随着空间尺度的变化趋势大致相同,且都在小尺度上表现为正关联。We investigated the mechanisms underlying the spatial point patterns of sand-fixing shrubs,including Artemisia ordosica and the coexisting shrubs Corethrodendron fruticosum var.mongolicum,Caragana korshinskii,and Corethrodendron scoparium in the Mu Us Sandy Land.The pair correlation functions g(r)and null models were used to analyze the spatial distribution patterns and correlations of A.ordosica at different growth stages,as well as the spatial dynamics of the three coexisting shrubs.The results showed that under the influence of seed dispersal limitation,A.ordosica and the three coexisting shrubs,predominantly exhibited a spatial pattern of small-scale aggregated and large-scale random distribution.Intraspecific associations of A.ordosica were largely positive or non-significant,primarily influenced by seed dispersal limitations.After excluding habitat heterogeneity,interspecific associations between A.ordosica and C.mongolicum,as well as between A.ordosica and C.korshinskii,displayed positive correlations at small scales(0-4 and 0-2 m)but no significant correlations at medium and large scales(3-20 and 2-11,13-20 m).There was no significant correlation between A.ordosica and C.scoparium at small and medium scales(0-13 m),but negative correlation at large scales(13-20 m).The spatial associations between young A.ordosica and the three coexisting shrubs were weakest across different growth stages.In contrast,vegetative and reproductive individuals showed similar trends,with both displaying positive associations at small scales.

关 键 词：毛乌素沙地 黑沙蒿 固沙灌木 空间点格局 空间关联性 零模型 

分 类 号：G63[文化科学—教育学]