基于浓度-吸光值函数预测土壤速效钼占比数据

土壤速效钼是指土壤中易被作物吸收利用的钼素，是表征土壤钼素供应状况的重要指标之一，及时测定和了解土壤中速效钼占比情况及其变化，对指导钼肥的施用是十分必要的。另外按照土壤样品号结合地理信息系统（GIS）技术，将各地点的土壤数据和信息进行深度整合和分析，绘制土壤速效钼占比地图，以直观的可视化形式呈现给用户。土壤速效钼浓度-吸光值函数是用于检测土壤中速效钼占比的方法，它是基于测定不同浓度的速效钼溶液在相同条件下吸收光谱从而测定钼离子的原理制成的。首先，包括4个标准点分别为2g/L、3g/L、5g/L和10 g/L，用原子吸收分光光度计测量出这4个标准点的吸光值‌，从而可以确定出浓度-吸光值函数（Y=12.81*X-1.165，其中X为速效钼溶液浓度，Y为吸光值)；其次，将土壤样品重量为AKg配制成10L的速效钼溶液，再用原子吸收分光光度计测量出该溶液的吸光值Y1，根据第一步得出的浓度-吸光值函数反推算出速效钼溶液浓度X1；最后，速效钼在土壤中的占比=速效钼的重量/土壤样品重量=10*X1/（A*1000）。

Soil available molybdenum refers to the molybdenum readily absorbable and utilizable by crops, and is one of the important indicators characterizing the molybdenum supply status of soil. Timely determination and understanding of the proportion and dynamic changes of available molybdenum in soil are highly necessary for guiding the application of molybdenum fertilizers. In addition, combined with soil sample numbers and Geographic Information System (GIS) technology, in-depth integration and analysis of soil data and information from various locations are conducted, and a map of soil available molybdenum proportion is drawn to present to users in an intuitive visual format. The soil available molybdenum concentration-absorbance function is a method for detecting the proportion of available molybdenum in soil, which is developed based on the principle of determining molybdenum ions by measuring the absorption spectra of available molybdenum solutions of different concentrations under identical conditions. First, four standard points with concentrations of 2 g/L, 3 g/L, 5 g/L and 10 g/L are selected. The absorbance values of these four standard points are measured using an atomic absorption spectrophotometer, so that the concentration-absorbance function can be determined (Y=12.81*X - 1.165, where X is the concentration of the available molybdenum solution and Y is the absorbance value). Second, a 10 L available molybdenum solution is prepared from a soil sample weighing A kg. The absorbance value Y1 of this solution is measured using an atomic absorption spectrophotometer, and the concentration X1 of the available molybdenum solution is back-calculated based on the concentration-absorbance function obtained in the first step. Finally, the proportion of available molybdenum in soil = weight of available molybdenum / weight of soil sample = 10*X1/(A*1000).