云南陆良植烟土壤粒径分布及其分形维数空间变异研究

发布时间：2018-08-18 07:48

【摘要】：采用GPS定位技术,在陆良烟区采集土壤样品341个。采用经典统计学、地统计学和分形数学相结合的方法研究了土壤粒径分布及其分形特征的总体特征、空间变异特征,同时分析了土壤粒径分形维数与土壤颗粒组成及土壤养分的关系,以及土壤粒径及其分形维数的影响因素。结果表明,土壤颗粒含量及其分形维数在不同质地土壤间存在显著或极显著水平差异;粘粒含量和分形维数表现为轻粘土重壤土中壤土轻壤土,砂粒和粉粒含量则相反;土壤颗粒质量分形维数在2.524~2.928之间,平均为2.823;土壤颗粒分形维数与土壤粘粒含量呈极显著正相关关系,与粉粒及砂粒含量呈极显著负相关关系;土壤颗粒分形维数可直观地反映土壤粒径分布;土壤颗粒含量和土壤粒径分形维数均具有中等的空间相关性,其空间变异是由结构性因素和随机性因素共同决定的结果,变程仅为0.12~0.27 km,表明其空间自相关范围较小,空间分布主要呈东西向变化趋势,高低值区域分异和明显;土壤粒径分形维数D值与全氮、全磷、全钾、碱解氮和速效钾呈极显著正相关,与有效磷含量呈极显著负相关,土壤分形维数可用于表征土壤养分状况;海拔高度、有机质、土壤类型、地形、轮作模式均对土壤颗粒含量和土壤粒径分形维数有显著影响。
[Abstract]:341 soil samples were collected in Luliang tobacco-growing area by GPS positioning technology. The general characteristics and spatial variability of soil particle size distribution and its fractal characteristics were studied by means of classical statistics, geostatistics and fractal mathematics. The relationship between soil particle size fractal dimension and soil particle composition and soil nutrients was analyzed. The results showed that there were significant or extremely significant differences in soil particle content and fractal dimension between different texture soils; clay content and fractal dimension were in light loam and light loam, while sand and silt content were in reverse; fractal dimension of soil particle mass was 2.5. The fractal dimension of soil particles was positively correlated with clay content and negatively correlated with silt and sand content; the fractal dimension of soil particles could directly reflect the distribution of soil particle size; and the fractal dimension of soil particle content and soil particle size had medium spatial correlation. Spatial variability was determined by both structural and stochastic factors. The range of variation was only 0.12-0.27 km, indicating that the spatial autocorrelation range was small, and the spatial distribution was mainly in the trend of East-West change, and the fractal dimension D value of soil particle size was significantly positive with total nitrogen, total phosphorus, total potassium, alkali-hydrolyzed nitrogen and available potassium. The fractal dimension of soil can be used to characterize soil nutrient status. Altitude, organic matter, soil type, topography and rotation mode have significant effects on soil particle content and fractal dimension of soil particle size.
【作者单位】：湖南农业大学烟草研究院;四川中烟工业有限责任公司;广西中烟工业有限责任公司;
【基金】：国家烟草专卖局重大专项“曲靖市精益烟叶生产研究与应用”(2014YN24)资助~~
【分类号】：S152

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