There are many research methods for soil nutrients. Scientists used soil nutrient fastness tester to analyze the distribution of soil nutrient profile and found some interesting phenomena. The discovery of nutrients can give us a better understanding of the changes and circulation of nutrients. There will be great benefits to the growth of agricultural fertilized crops in the future.

The variability of soil nutrient profile distribution The soil nutrient variability at different depths of the soil under two restoration methods is shown in the table. As can be seen from the table, the order of the average coefficient of variation of the soil nutrient indicators is approximately: total nitrogen> total phosphorus> total potassium> pH. The differences in variability of total nitrogen, total phosphorus, and total potassium are not only related to the effects of vegetation type, but also related to the turnover cycle and utilization patterns of nitrogen, phosphorus, and potassium in soil. The specific transformation and utilization mechanisms need further study. Different indicators are different in each soil depth, and the general trend is that the maximum coefficient of variation is within the depth of 10-30cm. The reason may be that the plant roots are mainly active in this depth range, plant growth consumes a large amount of soil nutrients, and the amount of recharge is not enough. Topsoil, therefore, results in greater disturbance of soil nutrients within the depth of the soil layer, resulting in a larger coefficient of variation than other soil layers.

The results of soil nutrient profile distribution showed that the effects of artificial afforestation and natural enclosure on soil nutrient accumulation were different, and the soil nutrient content of each soil under the two recovery modes also showed a deepening of the soil layer. Very different trends. On the whole, soil total potassium shows that artificial afforestation is more conducive to the accumulation of total potassium, while soil total nitrogen and soil total phosphorus are within the depth of 10-30cm for the artificial afforestation basin is lower than the natural enclosure, and other depths are also All of them are higher in the soil of artificial afforestation basins. In general, the content of these three types of soil nutrient artificial afforestation watersheds is larger than that of the natural enclosed watersheds, which indicates that the restoration of artificial vegetation in the study area is more conducive to the accumulation of three soil nutrients than the natural enclosure. The pH value of the soil is generally lower in the artificial afforestation basin, indicating that there is a tendency toward acidification in the artificial afforestation soil compared to the natural enclosure.

It is worth noting that the changes in total nitrogen, total potassium, and total phosphorus content in the natural enclosed watershed as a function of soil depth all show a trend of increasing first and then decreasing, which may be related to the herbaceous communities in the natural enclosed watershed.

The herb community as a whole has a shallow depth of root activity, and has the highest degree of utilization of nutrients in the surface soil, while the use of nutrients in the middle layer of the soil is slightly smaller, so the surface soil nutrients are lower than the middle layer. In the lower soil layer, because of the characteristics of loess, the nutrient originally held by the loess is less, and there is less nutrient exchange with the vegetation on the ground. Therefore, the content of total nitrogen, total phosphorus, and total potassium is relatively small. However, soil nutrients in artificial afforestation watershed decreased first and then increased as soil depth deepened. This was also due to the effects of above-ground vegetation. The aboveground vegetation in the artificial afforestation watershed was a mixed forest of trees, shrubs and grass, and its use of soil nutrients was deeper than that of herbaceous communities. In addition, there were more remnants of litter on the ground than herbaceous communities. Therefore, the three soil nutrients such as total nitrogen, total phosphorus, and total potassium all decreased and then increased with soil depth. Vegetation type has a significant impact on the accumulation of soil nutrients. Different plant communities have different root activity depths, root exudates and dead roots, which make them have a great influence on the absorption intensity and depth of soil nutrients and their recharge ability. difference.

The artificial afforestation basin has developed a complex structure of mixed trees, shrubs and grasses. The production of a large number of plant litters and dead roots will make the soil nutrients be supplemented. Therefore, the total potassium, total nitrogen and total phosphorus in the soil are higher than those in herbs. The main vegetation of the natural enclosed watershed. A large number of growing shrubs and shrubs have a deeper root activity, which results in depletion of soil nutrients within a depth of 10-30 cm within the artificial afforestation basin. They have not yet been replenished in time. Therefore, soils within 10-30 cm depth within the artificial afforestation basin are present. Total nitrogen and total phosphorus are lower than those of natural enclosure. However, the total potassium content in the depth range of the soil is expressed as the artificial afforestation basin is slightly higher than the natural enclosed watershed. This is because the soil in this area is relatively rich in potassium, and the main available potassium is available potassium, so the middle layer of soil Total potassium shows a different pattern of variation from total nitrogen and total phosphorus.

Construction Hoist Electrical Parts

Some common electrical parts used in construction hoists include:

1. Control panel: This is the main electrical component that allows the operator to control the movement of the hoist. It typically includes switches, buttons, and indicators for various functions such as raising, lowering, and stopping the hoist.

2. Motor: The motor is responsible for providing the power to operate the hoist. It converts electrical energy into mechanical energy to lift and lower the load.

3. Limit switches: These switches are used to set the upper and lower limits of the hoist's movement. They help prevent the hoist from overtraveling and causing damage.

4. Emergency stop button: This is a safety feature that immediately stops the hoist's operation in case of an emergency or malfunction.

5. Overload protection: This is a safety mechanism that automatically stops the hoist if it exceeds its maximum load capacity. It helps prevent accidents and equipment damage.

6. Electrical cables and wiring: These components connect the various electrical parts of the hoist, allowing for the transmission of power and control signals.

7. Circuit breakers and fuses: These protective devices are used to prevent electrical overload and short circuits. They automatically cut off the power supply in case of excessive current flow.

8. Voltage regulator: This device ensures a stable and consistent supply of electrical power to the hoist, protecting it from voltage fluctuations.

9. Sensors: Various sensors, such as proximity sensors or limit switches, are used to detect the position, speed, or presence of objects in the hoist's path. They provide feedback to the control system and help ensure safe and efficient operation.

10. Wiring connectors and terminals: These components are used to connect and secure the electrical wires in the hoist, ensuring reliable and safe connections.

The specific electrical parts used in a Construction Hoist may vary depending on the manufacturer and model. It is always recommended to refer to the hoist's user manual or consult with a professional for accurate information.

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