The Application of GIS Techniques in Distribution of Soil Trace Elements in Tropical Area: A Case Study of Zinc

Taking Hainan Island as the object, this study adopted field investigation and spatial analysis methods to reveal the abundance and deficiency rules of available zinc in agricultural soil on the basis of clarifying the spatial distribution of the content of available zinc in Hainan Island, in order to provide the basis and ideas for provincial scale soil zinc element regulation. The results showed that the content of soil available zinc in Hainan was generally rich, and the concentration of soil available zinc was 5.69 mg/kg, but its spatial variability was high. The content of soil available zinc was the highest in Wuzhishan and the lowest in Changjiang. The contents of soil available zinc in orchards was the highest (9.32 mg/kg), while that in dry land was the lowest (4.17 mg/kg).The content of soil available zinc in Hainan Island showed a zonal distribution from southeast to northwest, and it was lower than 0.5 mg/kg in Wanning in the southeast of Hainan Island.