五华县崩岗洪积扇土壤分形特征及空间变异性研究

发布时间：2018-04-25 23:20

本文选题：洪积扇 + 分形维数　；参考：《水土保持学报》2016年05期

【摘要】：以广东省五华县典型崩岗洪积扇为研究对象,通过GPS RTK获取从扇顶到扇缘64个采样点的坐标、高程信息,并采集土壤样品进行理化性质的测定及分析,通过分形理论、回归分析和地统计学相结合的方法研究洪积扇土壤分形特征和空间变异规律,以及分形维数与土壤颗粒组成和养分含量的相关关系。结果表明:土壤颗粒组成和养分含量具有明显的空间分异特征,且与分形维数的空间分布呈现出一定的规律性。从扇顶到扇缘,土壤粉粒、粘粒质量分数和养分含量逐渐增加,与分形维数呈显著正相关线性关系,砂粒质量分数则逐渐减少,与分形维数呈显著负相关线性关系,其中洪积扇土壤粘粒含量对土壤颗粒分形特征影响最大,相关系数达到0.969。研究结果表明,土壤分形维数是能反映土壤质地差异以及土壤肥力状况的一项综合性定量指标。
[Abstract]:Taking the typical avalanche flood fan in Wuhua County, Guangdong Province as the research object, the coordinates and elevation information of 64 sampling points from the top of the fan to the edge of the fan were obtained by GPS RTK, and the physical and chemical properties of soil samples were measured and analyzed through fractal theory. The fractal characteristics and spatial variation of alluvial fan soil were studied by means of regression analysis and geostatistics, and the correlation between fractal dimension and soil particle composition and nutrient content was also studied. The results showed that the soil particle composition and nutrient content had obvious spatial differentiation characteristics, and the spatial distribution with fractal dimension showed a certain regularity. From the fan top to the fan edge, the soil silt, clay mass fraction and nutrient content increased gradually, showing a significant positive correlation with fractal dimension, sand mass fraction gradually decreased, and significantly negative linear relationship with fractal dimension. Among them, the clay content of alluvial fan soil has the greatest influence on the fractal characteristics of soil particles, and the correlation coefficient is 0.969. The results show that the fractal dimension of soil is a comprehensive quantitative index which can reflect the difference of soil texture and soil fertility.
【作者单位】：华中农业大学资源与环境学院;
【基金】：国家自然科学基金“花岗岩红壤优先流及其与崩岗侵蚀发育的关系”(41571258)
【分类号】：S158;S152

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