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Phosphorus deficiency is a common problem in red soil. After the artificial use of red soil, especially the poor utilization of soil erosion, the degree of phosphorus depletion will further deepen. From the analysis of this paper, among the analyzed nutrients, the soil phosphorus is also the most severely degraded. The average soil total phosphorus in the 4 types of commercial forests accounted for 60.00% of the average, with moderate to poor and moderate and severe barren. The sum of two levels reached 73.40%. It shows that on the one hand, commercial forest management has exacerbated soil erosion, and the sum of moderate and severe poverty has reached 73.40%. On the other hand, artificially supplementing phosphorus deficiency results in a deepening of soil phosphorus depletion. From the standpoint of different commercial forests, the degree of soil total phosphorus and available phosphorus depletion are the most serious in the Chinese fir plantation, and the sum of total phosphorus and available phosphorus and medium and poor barren account for 88.10% and 88.13%, respectively; Light is the fruit forest soil, and the sum of total phosphorus and available phosphorus in the severely moderately infertile two grades accounted for 42.86% and 57.14%, respectively.
The soil nutrient tester is mainly composed of sandstone, siltstone, granite, and tuff in the study area. The parent rocks contain large quantities of potassium-containing minerals, resulting in the formation of more potassium in the soil than in other regions of Zhejiang Province. The degree of soil potassium depletion in commodity forests analyzed this time was lighter than that of other nutrients. Potassium is less lean in total potassium and available potassium. From the overall perspective of the four types of commercial forests, the rich first class accounted for 26.13%, and the sum of severe and moderately infertile accounts for only 44.71%, which is much lighter than that of total nitrogen, especially total phosphorus, and the availability of rapidly available potassium. On the whole, similar to hydrolyzed nitrogen, the highest proportion was mildly barren grade, averaging 41.25%, but it was significantly lighter than the effective phosphorous depletion level. From the standpoint of different commercial forests, soil total potassium is the lightest in terms of soil depletion in fruit trees, accounting for 57.15% at the rich level and 9.0% at the intermediate level of moderately infertile soils. There are no severely barren soils, and the degree of soil available potassium is relatively poor. The lighter ones are the bamboo and fir forests rather than the fruit forests, which are less depleted in the analyzed soils of the fruit trees, and the less degraded hydrolyzed nitrogen is similar. This shows that although the fruiting soil cultivation is frequent, but the fruit growers more, so the total soil nitrogen, phosphorus, potassium is higher, but the fruit trees of the soil nutrient consumption is large, so the soil available nutrient content is often not high.
Commercial forest lands are common in the hilly regions of the South. In these commercial forests, the artificial cultivation, excavation, cultivation, and other artificial measures are frequently used in the establishment and cultivation of these commercial forests. As a result, the soil erosion is aggravated, and the original soil with low natural fertility appears in the red soil. The further degradation of fertility. The decrease of soil nutrient content has become a major aspect of soil degradation in this area. It is an urgent task for soil workers to carry out evaluation of soil quality in this area, especially evaluation of nutrient degradation. The determination of soil nutrients generally requires the use of a soil nutrient tester for the determination, providing favorable conditions for the development of commercial woodland.
April 01, 2023