摘要
通过对西藏高原干旱半干旱区4种土地利用类型的土壤全样和层样采集与测定,运用土壤粒径的质量分布原理,计算出它们的分形维数。并分析其与土地利用方式、土壤肥力的关系。同时还探讨了土壤分形维数在剖面不同深度的纵向变化。结果表明:i.土壤分形维数不仅可以反映土壤质地的均一程度,而且可以间接反映自然环境变化和人类活动对土壤理化性质的影响。ii.土壤肥力与土壤分形维数有显著的相关性。当土壤颗粒组成分形维数Dp<2.65和微团聚体组成分形维数Da<2.44时,土壤肥力最佳。iii.Dp值和Da值随深度呈波状变化,峰值出现的深度与土地利用方式和人类活动密切相关。
Based on sampling and measuring whole and layered samples, fractal dimension have been figured out by the principle of soil particle size. The study also analyzed the relationship between fractal dimension and land - use patterns, soil fertility. Even discussed vertical distribution character of fractal dimension in various depth of profile. The results indicates that (i),fractal dimension can been applied to estimate symmetrical degree of soil texture and even can show indirectly the effect of environment change and human activities on soil properties, (ii),there is an obvious correlation between fractal dimension of and soil fertility, i.e. when the fractal dimension of soil particle size distribution Dp<2.65 and he fractal dimension of soil micro - aggregate size distribution Da<2.44 soil fertility is best, (iii), Dp value and Da value would fluctuate flexuously with soil depth. The depth which peak value of fractal dimension exists in is quite relative to land - use methods and human activities.
出处
《山地学报》
CSCD
2003年第B12期58-63,共6页
Mountain Research
基金
国家自然科学基金项目(50099620)。~~
