The soil samples and the soil nutrient tester were used to measure the collected soil samples. After being air-dried, deagglomerated, ground, and sieved through 1 mm and 0.25 mm, the soil pH was measured by conventional method (potentiometric method, water to soil ratio was 1: 2.5), Organic matter (dilution heat - Potassium dichromate volumetric method), All N (Kaishi method), Effective P (hydrochloric acid-ammonium fluoride-molybdenum cerium anti-comparison method) and K (ammonium acetate-flame photometric method) ).
A comparative study of its protective effect on soil nutrients was conducted in order to screen out the best soil and water conservation forests and configuration models for preventing and controlling soil erosion and soil nutrient loss, so as to facilitate popularization and application. Analysis of variance of soil nutrients in artificial soil and water conservation forest with four different configuration models . In order to understand the protective effect of four different types of artificial soil and water conservation forests on soil nutrients, the variance analysis of soil nutrient content was conducted. In the first method, assuming that the original nutrient contents of the four plantation plots under study are the same, the soil nutrient data collected over many years by the soil nutrient tester is used as single-factor analysis of variance and analysis of variance.
The variance analysis of soil nutrient content in different soil layers measured by soil nutrient tester, multiple comparisons, and comparison of coefficient of variation of the first principal component show that the soil nutrients in different forests are highly sensitive and stable in surface soil samples. Due to the strong correlation between soil nutrients, principal component analysis was performed in order to avoid the reuse of some potential information analysis and to have a comprehensive, comprehensive, and consistent understanding of the soil nutrient tester for the study subjects.
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