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Ningxia University (2019)

Studies on Fine-scale Spatial Pattern of Agropyron Mongolicum Population in Desert Steppe in Ningxia

许爱云;

Titre : Studies on Fine-scale Spatial Pattern of Agropyron Mongolicum Population in Desert Steppe in Ningxia

Auteur : 许爱云;

Grade : Master’s Theses 2019

Université : Ningxia University

Résumé
In order to study the ecological process and environmental plasticity mechanism of Agropyron mongolicum population.The desert steppe which dominated by A.mongolicum in Yanchi,Ningxia was selected as investigative plots by using the method combining of point pattern analysis and geostatistics analysis.The plant structure,the spatial distribution pattern and association of intraspecific and interspecific in the fine scales were studied.The spatial characteristics of A.mongolicum population and the geographical factors in the heterogeneous habitat,the effects of different sampling scale and zoning approaches were discussed.The results were as follows:The proportion of 0-5 cm and 5.1-10 cm clusters were significantly higher than those of 15-20 cm and more than 20 cm clusters in A.mongolicum population,accounting for 79.24%of the total population.The population had adequate regenerative seedlings and exhibited good development trend in the 10 mx 10 m sample plot.The 0-15 cm clusters mainly aggregated at a small spatial scale(less than 4 m),and the aggregation degree strengthened with the decrease of individual size.As the scale increased,the aggregation degree decreased and gradually transformed to random and uniform distribution.The clusters larger than 15 cm of A.mongolicum appeared as random distribution at all scales.The association within 0-15 cm cluster degrees of A.mongolicum showed significant positive relationship at a small scale(less than 4 m),and tended to be unassociated with the increase of the scale.The remaining cluster levels showed no association at the 0-5 m scale.The A.mongolicum population mainly appeared as aggregated distribution in different communities,with the aggregation scale of less than 4 m.As the scale increased,the aggregation degree decreased and gradually transformed to random and uniform distribution

Mots clés : Desert steppe; Agropyron mongolicum; Point pattern analysis; Spatial heterogeneity; The modifiable areal unit;

Présentation (CNKI)

Page publiée le 22 mai 2020