山西典型人工林土壤微团聚体分形特征及其与抗蚀性关系研究

Study on fractal feature of soil micro-aggregates and its relationships with soil anti-erodibility of typical plantations in Shanxi province

以山西中阳县5种典型人工林下的土壤为研究对象,运用分形模型对不同林分经营模式下土壤微团聚体进行研究,探讨了分形维数与土壤养分、土壤抗蚀性之间的关系。结果表明：不同人工林下的土壤微团聚体的粒径分形维数介于2.2538~2.3812之间,混交林的平均分形维数最小,黄刺玫林最大,乔木林的分形维数小于灌木林;0.25~0.02 mm粒径含量越大,分形维数越小,0.02~0.002 mm粒径含量越大,分形维数越大;分形维数与土壤有机质、全氮呈显著负相关,与土壤抗蚀性指数呈负相关;土壤微团聚体的分形维数可以作为评价土壤性质的综合指标。从分形维数看,混交林对土壤的改良效果最好。

In this paper,the fractal model is used to study the micro-aggregates of five different plantation lands in Zhongyang of Shanxi Province,and to inquiry the relation between fractal dimension and soil main properties. The results show that the fractal dimensions of miero-aggregates of five different plantation lands are between 2.2538-2.3812. The average fractal dimension of mixed plantation lands is the smallest, and the Rosa xanthina＇s is the largest. Arbor＇s is smaller than Shrubbery＇s;the larger the content of 0.25-0.02mm soil microaggregates, the smaller the fractal dimension; the larger the 0.02-0.002mm＇s the higher the fractal dimension; there is a negative relationship between the fractal dimension and the content of OM, TN and the soil antierodibility indice. The fractal dimension may be a good index for describing character of soil properties, and the resuhs show that the mixed woodland is beneficial to improvement of the soil physical and chemical properties.