摘要
以川中丘陵区微地形95个土壤样品的机械组成,运用分形模型计算出土壤颗粒分形维数,探讨了分形维数与土壤粒度组成的关系,并分析土壤颗粒分形维数在小尺度上的空间异质性。研究表明:土壤颗粒分形维数能够很好的表征土壤质地,重点反映小于0.05mm的细颗粒物质,尤其是粘粒,其次是粉粒;空间分析表明土壤分形维数在微地形上受地形影响,高值区多出现在丘顶及丘腰中上部,低值区出现在丘脚及冲沟处,土壤颗粒分形维数能够反映出丘陵区水土流失的强度。
95 soil panicle samples colleced from micro-topography of the middle Sichuan basin hilly areas were calculated the fractal dimension of soil particle, in order to probe the relation between the fractal dimension and the composition of soil grain-size and analyse the small-scale heterogeneity of the soil particle fraetal dimension. The results showed that the fractal dimension of soil particle could reflect soil texture perfectly, especially of the fine particles （smaller than 0.05mm）. The spatial analysis indicated that the topography influenced the fractal dimension of soil particle, the high value was in the top and middle of the hill. The fractal dimension of soil particle could reflect the intensity of soil and water loss in hilly areas.
出处
《土壤通报》
CAS
CSCD
北大核心
2009年第3期471-475,共5页
Chinese Journal of Soil Science
基金
国家星火计划"四川农业科技110示范工程"(2005EA810087)
四川省自然科学重点项目"基于3S技术的丘陵区耕地肥力质量动态监测与应用研究"(2006A001)
四川省自然科学重点项目"基于‘3S技术’的四川盆地土壤质量时空演化研究"(2003A009)
关键词
微地形
土壤颗粒
分形维数
空间变异
丘陵区
Microtopography
Soil particle
Fractal dimensions
Heterogeneity
Hilly area
