海口市琼山区土壤有效硫现状研究

Study on Soil Available Sulfur Actuality in Qiongshan Area of Haikou

采集海南海口市琼山区8个乡镇5种主要土类的798个耕层土壤,分析了土壤有效硫含量。结果表明：全区土壤有效硫含量平均为54.54 mg/kg,最低0.10 mg/kg,最高275.80 mg/kg,变异系数在0.34-1.34之间,所有乡镇平均有效硫含量均在临界值16 mg/kg以上;不同土类土壤有效硫平均含量大小顺序依次为：石质土〉潮沙泥土〉水稻土〉砖红壤〉滨海沙土,滨海沙土的有效硫含量严重缺乏;海口市琼山区有96.54%的土地面积有效硫含量处于不缺或丰足水平,严重缺硫出现在龙塘镇,严重缺硫面积为10.26 km^2,占琼山区土地总面积的1.13%。总体来说海口市琼山区土壤有效硫含量丰富,缺硫土地面积分布很小。

798 soil samples of 5 soil types were taken from 8 towns in Qiongshan area of Haikou city and their available sulfur contents were analyzed. The result showed that the average available sulfur content was 54.54 mg/kg, with the minimum of 0.10 mg/kg and the maximum of 275.80 mg/kg, and the coefficient of variation was between 0.34 - 1.34. The available sulfur average content of all townships was up to critical value of 16 mg/kg. The sulfur content varied in different soil types, the consequent succession followed as Litho soil 〉 moistly sandy soil 〉 paddy soils 〉 laterite 〉 coastal sandy soil, the serious lacking of soil available sulfur was coastal sandy soils. It was 96.54 % land area of Qiongshan area had adequate soil available sulfur, the most lacking of soil available sulfur was Longtong town ; the area was about 10. 26 square kilometers. Overall, the soil available sulfur content of Qiongshan area were very rich, small area appears soil available sulfur deficiency.