不同母质发育紫色土团粒结构的分形特征研究

Study on Fraction Characters of Aggregates of Dryland Purple Soil Developed from Different Parent Material

运用分形模型对不同紫色母质发育的土壤团聚体特征进行研究,结果表明:土壤团聚体粒径分布的分形维数与土壤团聚体结构破坏率存在极显著正相关(r=0.961**,n=8),与>0.25mm水稳性团聚体含量存在极显著负相关(r=-0.958**,n=8);不同紫色母质发育的土壤团聚体粒径分布的分形维数存在差异,棕紫泥土壤团聚体粒径分布的分形维数最高,暗紫泥土壤团聚体粒径分布的分形维数最低。土壤团聚体粒径分布的分形维数是评价土壤物理肥力和土壤抗蚀性的一个新指标。

The fractal models are applied to research the characters of soil aggregates developed from different purple parent material. The results show that the fractal dimensions are significantly regressive correlated with the structure damage rates of soil aggregates(r=0.961**,n=8)and the contents of waterstable aggregates(r=-0.958**,n=8); the fractal dimensions of soil aggregates particle fraction developed from different purple parent material are various; that of brown purple soil aggregates particle fraction takes the first place, and that of dark purple argils aggregates fraction is minimum; it may be inferred that fractal dimension is a new index which evaluates soil physical fertility and soil erosionresistant capability.