Study on the Integrated Observation Method of Multi Elements of Soil Environment

Among China's meteorological observation items, frozen soil, soil temperature, soil moisture and dry soil layer are elements which related to soil. These items are observed by a variety of single element observation equipments, while the frozen soil and dry soil layer have not yet achieved automatic observation. This paper proposes a multi-element integrated observation method for soil environment. The sensor measures the soil dielectric constant and temperature change through a planar capacitor and a semiconductor temperature measuring element to achieve the measurement of soil moisture and soil temperature. The water-induced freezing phase change causes dielectric The characteristics of the constant change of the constant, establish a mathematical model based on soil dielectric constant and ground temperature to invert frozen soil to achieve accurate measurement of frozen soil; soil moisture combined with soil hydrophysical constants can realize automatic observation of dry soil layers. The experiment shows that the multi-element sensor of soil environment can accurately measure the elements such as soil moisture and frozen soil. The measurement data is consistent with the trend of manual observation, and the automatic observation of frozen soil and dry soil layer is realized.