Soil nutrient rapid tester test plot and environmental factors
The correlation analysis of soil nutrients has a great relationship with environmental factor variables. The soil nutrient rapid tester test samples and environmental factors show different correlations in soil nutrients in the study area. The slope factor is positively correlated with total nitrogen, total phosphorus and phosphorus, and negatively correlated with organic matter, total nitrogen and potassium, and alkaline potassium. The slope direction is positively correlated with soil thickness and most nutrients, especially slope direction and soil thickness. The positive correlation nitrogen content is positively correlated.
The correlation between the bare rock exposure rate and the nutrients measured by the soil nutrient rapid tester is consistent with the influence of the rock formation factors on nutrients, and is opposite to the influence of vegetation coverage. This is mainly because the surface rock of the sloping farmland in the karst area has a high bareness rate, a large slope, and a thin soil layer. In addition, the precipitation in the karst area is large, and the surface soil is easily washed away by rainwater, resulting in slope soil. Nutrient elements are continuously lost and soil fertility is declining.
When cultivating the sloping land, selecting the land with less surface rock and less vegetation coverage has a certain effect on the retention of nutrients. From the numerical correlation analysis of soil nutrient rapid tester, it can be seen that soil organic matter, alkali nitrogen, available phosphorus and available potassium are affected by geomorphic factors to varying degrees. The correlation between rock stratum and rock dip and nutrients is similar, which proves that the two factors of rock stratum and rock dip have the same effect in the whole test plot.
Through the analysis of the above soil nutrient rapid tester, it is known that the spatial distribution and spatial variation of soil nutrient elements in the geological karst areas of slopes, slope directions, rock properties, and structural factors have important influences, and related vegetation cover. Random factors such as vegetation type, degree of crops and agriculture also have a certain effect on the spatial variability of organic matter content.
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