深圳不同植被类型城市土壤团聚体组成与分形特征

采用干筛法和湿筛法测定了深圳市乔木、灌木、草地植被绿地土壤团聚体粒径质量分布,并基于分形理论研究了土壤团聚体分形特征。结果表明,①乔木、灌木、草地之间土壤>0.25mm粒级团聚体、平均质量直径及土壤分形维数均差异显著;土壤团聚体稳定性总体表现为草坪绿地>乔木绿地>灌木绿地。②土壤非稳性团聚体分形维数、>0.25mm粒级团聚体以及平均质量直径之间均极显著相关;水稳性团聚体分形维数、>0.25mm粒级团聚体、破坏率以及平均质量直径之间均极显著相关。植被类型显著影响城市绿地土壤团聚体分布及其分形特征。

Aggregate Composition and Fractal Characteristics of Urban Green Space Soils under Different Vegetation Types in Shenzhen

Soil water-stable and water-unstable aggregates under trees,shrubs and turf vegetation were determined by dry and wet sieving methods,and soil fractal characteristics were analyzed based on the fractal theory.The results showed that,①there were significant differences of soil aggregate content(>0.25mm),mean weight diameter and fractal dimension among the three vegetation types.As a whole,soil aggregate stability could be ordered as turf vegetation>tree vegetation>shrub vegetation.②there were significant correlations among fractal dimension,>0.25mm soil aggregate content and mean weight diameter in water-unable soil aggregate as well in water-stable aggregates.Vegetation types had significant effects on the aggregate composition and fractal characteristics of urban green space soil.