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。
This paper focused on the typically collapsing alluvial fan in Wuhua county,Guangdong province,collected 64 soil samples and points location information by GPS RTK from the top to the edge of the alluvial fan to do the analysis of physical and chemical property.Through the combination of fractal theory,regression analysis and geo-statistics method,the paper aimed to expound the soil fractal characteristic and spatial variability,and the correlation with soil particle composition and nutrient content in collapsing alluvial fan.The result indicated that there were obvious differentiation characteristics in soil particle composition and nutrient content,and presented certain regularity with the spatial distribution characteristics of fractal dimension.From the top to the edge of the alluvial fan,the proportion content of soil silt and clay and nutrient content increased gradually,and fractal dimension was a positive correlation with them.But the proportion content of sand decreased gradually,and presented a negative correlation with fractal dimension.Among them,clay content was the most influential factor to fractal dimension,and the coefficient correlation was up to 0.969.The results proved that the fractal dimension could be used as an important index of soil texture and fertility.
出处
《水土保持学报》
CSCD
北大核心
2016年第5期279-285,共7页
Journal of Soil and Water Conservation
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)
关键词
洪积扇
分形维数
土壤颗粒组成
土壤养分
空间变异性
alluvial fan
fractal dimension
soil particles
soil nutrient
spatial variability
