The system controller process decides when processes should be started or stopped depending on system state variables. It checks if other processes have produced information to be processed or to pass information to them for processing. The controller usually loops continuously, polling sensors and other processes for events or state changes. For this reason, this model is sometimes called an event-loop model. Centralized Control System,Mine Work Surface System,Mine Centralized Control System,Mine Centralized Work Surface Jinzhou Jinshi Mining Equipment Technology Co., Ltd. , https://www.jsminingeqpt.com
The soil nutrient tester uses GPS to locate a piece of 6319km2 in the Liangzi Lake Wetland Reserve, using the 400m@400m grid method to take 0)15cm soil samples at a fixed point, and the total number of samples is 101. The collection method is to use a soil drill to collect a sample of 5 samples within a radius of 30m centered on a fixed point, and then air-dried and sieved for use. Potassium dichromate volumetric method for soil organic matter; semi-micro Kjeldahl method for total nitrogen; boiled sulfuric acid-perchloric acid for total phosphorus; colorimetric method for molybdenum and antimony; alkalinity solution-diffusion for rapidly available nitrogen; 015 mol/ for rapidly available phosphorus L sodium bicarbonate extraction - molybdenum antimony colorimetric determination.
The distribution of soil nutrients in the study area is closely related to the topography, soil types and soil parent material. There is a high content of organic matter, total nitrogen and available nitrogen in the eastern, western and central regions. This area has a low topography, mainly lake beaches and swamps, and the soil is swamp soil formed by lake sediments. Plants in wetlands have large coverage and vigorous growth. After the plants die in winter, they are all returned to the soil and form humus under conditions of waterlogging. In the study area, the soil organic matter, total nitrogen, total phosphorus, available nitrogen, and available phosphorus were lower in the central and western regions and in the middle and eastern regions. Because of the high topography in this area, its parent material is Quaternary sediments. The soil is mainly submerged and cultivated paddy soil. Due to artificial cultivation, wet and dry alternation is frequent, and organic matter is less accumulated.
The results of soil nutrient tester showed that the spatial autocorrelation of soil available phosphorus was weak, and its spatial variation was mainly caused by random factors such as fertilization and sampling error. The ecological processes of the five kinds of soil nutrients acted on the same scale, and their spatially related changes ranged from 2853m to 296313m. The Kriging interpolation of soil organic matter, total nitrogen, total phosphorus, and available nitrogen reflects that their spatial distribution is similar, and the distribution of soil nutrients is related to topography, soil types, and soil parent material.
Soil Nutrient Tester to Study the Spatial Heterogeneity of Soil Nutrients in Wetlands
The soil has a high degree of spatial variability. There is spatial heterogeneity of the soil in both large and small scales. Quantitative methods were used to investigate the spatial heterogeneity of soil nutrients in Xianghai wetland. However, the soil fertility varies greatly among different types of wetlands. Even within the same wetland, soil fertility is not uniform and has a high degree of spatial heterogeneity. The purpose of the soil nutrient tester research is to reveal the spatial variability of soil nutrients in Liangzi Lake wetland, and provide some scientific basis for wetland protection and development.