摘要
以王朗自然保护区7种土壤为对象,运用分形模型研究了该区表层土壤颗粒粒径分布的分形维数,分析了分形维数与土壤理化性质如有机质含量、全氮、全磷、pH及容重的关系。结果表明,王朗自然保护区表层土壤颗粒的分形维数Dp为2.679 6～2.741 4;各土壤颗粒粒径与累积重量的对数相关系数R2>0.85(p<0.05);通过逐步多元回归分析,土壤颗粒的分形维数仅与粒径为0.001～0.005mm和小于0.001mm土壤颗粒含量呈显著正相关(p<0.05);此外,土壤颗粒的分形维数与土壤有机质、全氮、全磷和容重的关系不显著,然而土壤有机质含量与土壤全氮含量呈显著正相关(p<0.05)。通过对王朗自然保护区表层土壤颗粒粒径分布的分形维数的探究发现,该区土壤颗粒的分形维数偏低,土壤结构相对松散,易发生水土流失,需要加强该区生态建设。
Fractal theory was employed to analyze the fractal dimension of soil particle size distribution for seven generic soil in Wanglang, and the fractal dimension and the correlation between soil chemical properties （e. g. he content of organic matter, total nitrogen, total phosphorus, pH and volume density） was investigated. The results were indicated that the fractal dimension of soil particles in surface layer rang from 2. 679 6 to 2. 741 4. The logarithm correlation coefficient of the soil particle size between cumula- tive weight is more than 0.85 （p〈0.05）. The fractal dimension only has a very significant positive correlation with the content of 0. 001-0. 005 and less 0. 001 mm soil particles. In addition, no significant correlations are observed between the fraetal dimension and the contents of oil organic matter, oral nitrogen, otal phosphorus, pH and olume density, but there is a significant positive cor- relation between the contents of oil organic matter and otal nitrogen （p〈0.05）. Through studying of the fractal dimension of top soil particle size distribution of the Nature Reserve in Wanglang concluded that the fraetal dimension of soil particles is lower, and that soil structure is more loose and easily caused soil erosion, therefore it is indispensable to highlight ecological construction.
出处
《重庆师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第3期47-51,共5页
Journal of Chongqing Normal University:Natural Science
基金
四川省"十二五"农作物及畜禽攻关项目(No.2011NZ0098-12-7)
