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土壤团聚体稳定性评价方法比较
苏静1, 赵世伟2
1.延安大学西安创新学院, 陕西西安 710100;2.中国科学院水土保持研究所, 陕西杨凌 712100
摘要:
土壤团聚体稳定性是评价土壤结构和土壤物理形状的重要指标。对土壤团聚体分形维数、土壤团聚体平均重量直径和>0.25mm团聚体含量3种土壤团聚体结构评价的方法进行了探讨。结果表明, 分形维数与>0.25mm团聚体的含量呈负相关性, 但是平均重量直径与<0.25mm团聚体的含量有正的相关性。这三种方法都能应用来评价土壤结构, 但是分形维数不仅表示土壤结构, 还能说明土壤水分和土壤其它的物理性质。因此, 分形维数是评价土壤结构的较好的方法。
关键词:  团聚体  分形维数  平均重量直径  0.25mm团聚体含量
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基金项目:“十一五”国家支撑计划重大项目(2006BCA01A07;2006BAD09B08)
Comparison of the Analysis Methods for Soil Aggregate Stability
SU Jing1, ZHAO Shi-wei2
1.Xi’an Innovation College, Yan’an University, Xi’an, Shanxi 710100, China;2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
Abstract:
The soil aggregates stability is one of the important factors to analyze soil structure. Soil aggregates were investigated in view of the f ractal fraction, the amount of > 0.25 mm aggregates and the aggregate weight dimension (MWD). Results showed that there was a negative correlation between the fractal fraction and the amount of > 0.25 mm aggregates. On the contrary there was a positive correlation between the MWD and the amount of < 0.25 mm aggregates. This indicates that the fractal fraction and the MWD can be used to appraise soil structure and the fractal fraction is better than the MWD because the fractal fraction is able to reflect soil water and other properties.
Key words:  soil aggregate  fractal fraction  MWD  amount of > 0.25 mm soil aggregate