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A total of 174 samples were arranged for the regional distribution of four types of commercial forests in the city of Huzhou. There are 42 Chinese fir forests, 60 bamboo shoots, 30 tea plantations and 42 fruit trees. At the same time, 15 representative natural evergreen broad-leaved forest sites were selected as references. After selecting sample plots, a representative soil profile was set at each site, and soil samples from 0 to 30 cm soil samples were taken on the profile. The standard of soil nutrient depletion in the red soils of the low hilly area in the south is different, but there are some differences in the soils in different areas, especially the low-mountain and hilly soil nutrient circulation migration and leaching loss processes are very different. Since the natural evergreen broad-leaved forest is a zonal forest species in the area, the soil nutrient status of the evergreen broad-leaved forest can be used as a fertile standard for soil nutrients in the area.
By using a soil tester to analyze the soil of four samples, it can be found that the sum of organic matter and severe barrenness in the Chinese fir plantations, bamboo forests for bamboo shoots, and tea gardens accounts for more than 50%, which is 52.38%, 50.00%, and 53.33% respectively. The soil of the fruit trees is mainly lightly barren (52.38%), which is related to the use of organic fertilizers in some fruit trees. However, the proportion of soil organic matter in the four types of commercial forests is below 10%. Judging from the average value of the four types of commercial forests, the proportion of fertile organic matter and severe barren soil is not high, but mainly light and moderately barren, accounting for 35.60% and 40.12%, respectively.
From the measurement results of the soil tester, it can be concluded that the degree of soil nutrient depletion severity is in the order of China fir> bamboo forest> tea plantation> fruit forest, and single nutrient analysis shows that the soil nutrient is poorly degraded, and the degree of soil nutrient depletion in the fruit forest is the most The light result is consistent. Due to the fact that farmers are investing more fertilizer into fruit trees in production, soil erosion occurs in the course of operations, but soil nutrient content can still be maintained at a relatively high level. After the fir forest was excavated and afforested, there were few man-made fertilization measures. In addition to the high lignification of litter, the litter was difficult to be attached to the ground, and the decomposition rate was small. Therefore, the nutrient return rate was not high, resulting in a decrease in soil nutrient content. There are often fertilization habits in bamboo shoots and tea gardens for bamboo shoots, but the fertilization surface is not as broad as forests, and therefore the degree of soil nutrient barrenness is greater than that of fruit trees.
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Geotechnical analysis of soil barrenness in Huzhou's four commercial forests
Soil nutrients are the basic nutrient source for crop growth. During the development of commercial forest land in the south, due to artificial reclamation and fertilization, soil nutrients change. The decline in soil nutrient content is a major aspect of soil degradation in commercial forest land. Therefore, the evaluation of soil quality in the area, especially the degradation of nutrients, is very necessary. The determination of soil nutrients can be performed scientifically and effectively using a soil tester.