Influence of Topographical Factors on Spatial Distribution Characteristics of Soil Nutrients in Qinba Mountain Area

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To study the spatial distribution characteristics of soil nutrients in different micro-topography and their correlation with topographic factors, to provide reference basis for soil resource nutrient management and ecological environment construction in other areas with the same topography. This paper is based on 150 soil samples from 3 main tea-producing areas in Shangnan County, and analysis methods such as sampling analysis of variance and correlation analysis are applied to soil organic matter, total nitrogen, available potassium, and available effects under different micro-topography (slope, aspect, and slope position). The spatial distribution characteristics of phosphorus were analyzed and the correlation between soil nutrients and topographic factors was explored. The results showed that the contents of soil organic matter, total nitrogen, available phosphorus and available potassium in the surface layer (0-10cm) of the study area were significantly higher than those in the middle and lower layers of soil, all of which were of moderate intensity variation. Soil total nitrogen, available potassium, available phosphorus and organic matter content are affected to some extent by slope, aspect and slope position. In general, soil total nitrogen, organic matter content and slope position are significantly negatively correlated (P <0.05), and the slope direction showed a very significant positive correlation (P <0.01), while the soil available potassium and available phosphorus had a negative correlation with the slope position and slope (P <0.05).