EM38电磁发生仪测定结果的影响因素分析

Analysis on the Factors Affecting the Soil Salt Contents Measured with Electromagnetism Generator EM38

通过应用EM38电磁电导仪测量法调查了阿瓦提县丰收灌区土壤盐分含量,并将EM38读数与常规土壤含盐量测定方法所获得的结果进行比较,分析了对仪器电磁产生影响的因素。结果表明,用EM38测得的结果与土壤湿度、土壤质地、土壤温度、土壤盐分的高低、仪器距地面高度的不同都有显著的正相关性。并且对仪器所存在的问题及应用前景进行了探讨。

The study area, the Fengshou Irrigated Area in Awat County, Xinjiang Uygur Autonomous Region, islocated in the alluvial-diluvial fans of the Aksu River and the alluvial plains of the Yarkant River and KaxgarRiver, it is 70 km in length, and its irrigation area is about 4.0×104 hm2. The annual precipitation in the study areavaries in a range of 25～80 mm only, but the annual evaporation here is as high as 1 700～2 900 mm, the annualtemperature varies in a range of 10.4～11.5 ℃, and the annual accumulated temperature ≥10 ℃ varies in arange of 3 400～4 400 ℃. The crops grown here are mainly cotton, corn, wheat, vegetables, melons, fruits,grapes, etc. Soil in the Fengshou Irrigated Area is zonally distributed and is dominated by meadow soil, and thesoil texture is dominated by sandy loam. In this paper, the soil salt content in the Fengshou Irrigated Area in Awat County is surveyed using electromagnetism generator EM-38, the EM38 readings are compared with the results measured with the traditional measuring method, and the factors affecting the generation of electromagnetism are analyzed. The results are as follows: (1)To carry out the dynamic monitoring of soil texture, soil salt content and distribution using EM38 can provide the scientific basis for systematically monitoring and termly estimating land resources in land management, analyzing the restrictive factors during the different periods, and working out the planning of rational land use; (2)To carry out the dynamic monitoring of soil salt content and soil texture can qualitatively evaluate the quality, stability and degradation of the rehabilitated and reclaimed lands so as to select the suitable varieties of crops; (3)The measured EM38 values can be regarded as the scientific basis in land planning and leveling, and construction of irrigation works and shelter-forest systems based on the correlations between the soil texture, soil porosity, silt content, and groundwater depth and mineralization; (4) The relationships between the measured EM38 values, soil salt content and groundwater depth and mineralization can be used to guide the water-saving irrigation.