豫东平原盐碱地土壤颗粒分形特征

运用土壤颗粒分形维数模型,以河南大学明伦校区土壤为供试材料,分析了豫东平原盐碱地土壤颗粒的分形维数及其与土壤盐度、肥力指标的关系。结果表明:土壤颗粒分形维数介于2.556 2~2.796 3,平均值为2.714 4,土壤细颗粒物质越多,土壤颗粒分形维数越高;土壤盐度与土壤颗粒分形维数呈显著正相关;土壤颗粒分形维数与土壤阳离子交换量(CEC)呈显著正相关,与土壤有机质、碱解氮、速效磷、速效钾则均呈负相关。结合盐碱土的土壤性状,土壤颗粒分形维数可用作分析、评价盐碱土壤退化的定量指标之一。

Soil Particle Fractal Features of Saline-alkaline Soil in East Henan Plain

Taking soil samples in Minglun campus of Henan University as tested materials,a case study on the saline-alkaline soil particle fractal features in east Henan plain was conducted.The fractal dimension of soil particle size distribution as well as the relationships between fractal dimension of soil particle distribution and selected soil properties including soil sanility and soil fertility index were discussed.The results revealed that the saline-alkaline soil has significant fractal features.Its fractal dimension is between 2.5562 and 2.7963,and the average of its fractal dimension is 2.7144.The more the contents of soil fine particles,the higher the fractal dimension.There exists positively remarkable quantitative relationship between fractal dimension and soil properties including soil sanility ane CEC.However,there exists negative linear correlation between fractal dimension and soil fertility index including soil organic carbon,hydrolysis-N,avai-lable-P and available-K.So the fractal dimension of soil can be used as a quantitative index to eva-luate the soil degradation when combined with soil properties of saline-alkaline soil.