The influence of quadrat size on spatial heterogeneity of meadow grassland, Northern China

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Ye, Shengxing^1,2 ; He, Jing^2 ; Ding, Guodong^1 ; Chang, Xueli^3 ; Zheng, Zhirong^2 ; Diao, Zhaoyan^2 ; Lv, Shihai^2

College of Soil and Water Conservation, Beijing Forestry University, Beijing

100083, China^1

State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing

100012, China^2

Ludong University, Yantai

264025, China^3

关键词: Above ground biomass;    Functional classification;    Functional compositions;    Northern China;    Perennial plants;    Spatial heterogeneity;    Species richness;    Turning points;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/3/032161/pdf
DOI  :  10.1088/1755-1315/170/3/032161

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The objective of this study was to determine influence of survey quadrats size on spatial heterogeneity of meadow grassland in north China. An integrative approach was used based on field survey method that the sample line combined with sample quadrat to analyze the vegetation heterogeneity characteristics of Stipa + Leymus Mss. steppe in Hulunbeier grassland. Results showed that: perennial plants, C3 plants, and cluster grass plants were dominant communities in Hulunbeier grassland under different functional classification. And species richness of them were accounted for the total species richness of more than 86%, 90% and 23.4%, respectively. Despite the species richness of bunch grass plants was little in the functional composition classification, the above ground biomass was accounted for a larger proportion of 50.2%. From the spatial heterogeneity characteristics of Stipa+Leymus Mss. steppe, 6m2 is the turning point of the spatial heterogeneity of total species richness, species richness of perennial plant, cluster plant and C3 plant. That's because when the quadrat size is less than 6m2, the spatial heterogeneity of the total species richness, species richness of perennial plant, cluster plant and C3 plant were changed significantly with the quadrat size changed, and when the quadrat size is larger than that of 6m2, its spatial heterogeneity becomes small. The above analysis shows that in the field survey of Stipa+Leymus Mss. steppe, the quadrat size used in the survey should be not less than 6m2, for the summary vegetation information of quadrat size with 6m2 can describe the general characteristics of vegetation investigation well.