In the southern hills, large areas of commercial woodland are distributed in the red soil. Unlike the natural forests, they are cultivated for economic benefits. In the course of the construction and cultivation of these commercial forests, artificial measures such as hill-climbing, excavation, and cultivation are often used, which has aggravated the soil erosion and caused the further deterioration of fertility in the red soil where the original natural fertility was not high. Psychologists pointed out that the decline in 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 soil nutrient analyzer provides more effective help in the study of soil nutrients in mountainous areas.
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 soil nutrient analyzers, the soil phosphorus depletion was also the most serious among the nutrients analyzed. The average soil total phosphorus of the 4 types of commercial forests accounted for 60.00% of the average, while the middle and the poor were moderately barren and moderately. The sum of serious and poor grades 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 results of soil nutrient measuring instrument showed that the degree of soil nutrient leanness was in order of Chinese fir> bamboo forest> tea garden> fruit forest, and the soil nutrient in the Chinese fir plantation was seriously depleted, and the soil nutrient in the fruit forest was poor. The lightest results are 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 depletion is greater than that of fruit trees.
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 soil nutrient analyzers, the soil phosphorus depletion was also the most serious among the nutrients analyzed. The average soil total phosphorus of the 4 types of commercial forests accounted for 60.00% of the average, while the middle and the poor were moderately barren and moderately. The sum of serious and poor grades 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 results of soil nutrient measuring instrument showed that the degree of soil nutrient leanness was in order of Chinese fir> bamboo forest> tea garden> fruit forest, and the soil nutrient in the Chinese fir plantation was seriously depleted, and the soil nutrient in the fruit forest was poor. The lightest results are 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 depletion is greater than that of fruit trees.
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