摘要
多样生态过程导致了种群的空间格局变化,进而影响了物种之间的空间关联。从单一固沙灌木构成向灌草复合植被结构的自然演替,系旱区人工固沙植被系统长期管理的目标之一。本文使用点格局分析方法研究腾格里沙漠东南缘30~40年柠条固沙群落中柠条和优势草本,以及优势草本之间的空间关系。结果显示:以空间分布关系为指示,柠条(Caragana korshinskii)固沙群落中,柠条种内关系以竞争为主,优势草本植物在小尺度上共生,大尺度上竞争关系占优;柠条与优势草本的空间关系相对复杂,多偏向无相关性。30~40年的柠条固沙群落灌草植被配置依然具有很强的随机性,以灌草间强种间关系为指示的稳定群落构建,尚存不小的距离。植被演替的趋势仍有很大的不确定性。
Diverse ecological processes lead to changes in the spatial pattern of populations,which in turn affect the spatial associations between species.The natural succession from a single sand-fixing shrub composition to a shrub-grass composite vegetation structure is one of the long-term management goals of artificial sand-fixing vegetation systems in arid regions.In this paper,point pattern analysis were employed to investigate the spatial relationships between Caragana korshinskii and dominant herbaceous plants within C.korshinskii sand-fixing plant communities along the southeastern fringe of the Tengger Desert over a period of 30 to 40 years,as well as the spatial relationships among the dominant herbaceous plants themselves.The results showed that(1)The dominant shrub C.korshinskii exhibited a uniform and random distribution within the scale of the study,with intense intraspecific competition.Dominant herbs show strong population effects at a small scale,manifesting as clumped distribution.As the scale increases,intraspecific competition among dominant herbs intensifies,and the spatial pattern gradually shifted towards a uniform and random distribution.(2)From an overall perspec-tive,the community composed of the C.korshinskii population and the dominant herbaceous plant populations showed no significant spatial association within most of the study scale.The C.korshinskii and Artemisia sco-paria populations were uncorrelated across the entire study scale.The C.korshinskii with Cynodon dactylon,C.korshinskii with Bassia dasyphylla,and C.korshinskii with Chloris virgata populations exhibited a rela-tively clear negative association at a scale of 9.4 to 10 meters,indicating mutual exclusion between species.The C.korshinskii and Eragrostis minor population showed a clear positive correlation at a scale of 7.8 to 10 meters,suggested a symbiotic relationship between the species.(3)The spatial association among different dominant herbaceous plants was more complex,and the spatial associations between different population combi-nations also varied.As the study scale increases,the spatial association among different dominant herbaceous plants tends to become non-correlated.The interspecific relationships among different dominant herbs changed sharply with the variation in the study scale,and then gradually moderate.In summary,as indicated by spatial distribution relationships,within the C.korshinskii sand-fixing community,intraspecific competition was pre-dominant among C.korshinskii individuals,while dominant herbaceous plants showed symbiotic relationships at a small scale and competition at a larger scale.The spatial relationships between C.korshinskii and dominant herbaceous plants were relatively complex,often tending towards non-correlation.The shrub-herb vegetation configuration of C.korshinskii sand-fixing communities with an age of 30 to 40 years still exhibited a strong degree of randomness,and there remained a significant gap in the construction of stable communities,as indi-cated by the strong interspecific interactions between shrubs and herbs.
作者
张力
杨新国
王磊
张雪
曲文杰
刘荣国
张波
ZHANG Li;YANG Xin-guo;WANG Lei;ZHANG Xue;QU Wen-jie;LIU Rong-guo;ZHANG Bo(College of Ecology and Environmental Science,Ningxia University,Yinchuan,Ningxia 750021,China;Faculty of Agriculture,Forestry and Ecological Environment,Ningxia University,Yinchuan,Ningxia 750021,China;Ningxia Zhongwei Shapotou National Nature Reserve Administration,Zhongwei,Ningxia 755000,China;National Positioning Observation and Research Station for Wetland ecosystem of Yellow River in Ningxia,Yinchuan,Ningxia 750021,China)
出处
《草地学报》
北大核心
2025年第6期1886-1893,共8页
Acta Agrestia Sinica
基金
宁夏科技创新领军人才(2021GKLRLX13)
国家自然科学基金项目(32060313)
国家自然科学基金项目(32460355)资助。
关键词
荒漠草原
柠条
优势草本
点格局分析
空间关联性
Desert steppe
Caragana korshinskii
Dominant herbaceous plants
Point pattern analysis
Spatial association
作者简介
张力(1999-),男,汉族,宁夏固原人,硕士研究生,主要从事荒漠化植物生理生态研究,E-mail:zl18095453122@163.com;通信作者:曲文杰,E-mail:qwj202@nxu.edu.cn。
