海南省乐东黎族自治县土壤有效硫含量及分布特征研究

Studies on Available Sulfur Content in Soil and its Distribution Characteristics in Ledong Li Autonomous Country of Hainan Province

采集海南省乐东黎族自治县11个乡镇5种主要土类的787个耕层土壤,分析了土壤有效硫含量。结果表明:乐东县土壤有效硫含量平均为45.24 mg/kg,最低为3.26 mg/kg,最高1294.85 mg/kg。全县土壤有效硫平均值>16 mg/kg,总体不缺硫,但是局部地区存在缺硫现象。土壤有效硫含量<8 mg/kg的严重缺硫样点主要分布在千家镇与抱由镇,各占9.1%与7.9%。不同土类有效硫含量高低依次为滨海沙土>潮土>燥红土>水稻土>赤土。赤土缺硫比例占34.46%。可见,研究区域内的土壤有效硫含量存在明显空间变异。

787 soil samples of 5 soil types were taken from 11 towns in Ledong county of Hainan province and their available sulfur contents were analyzed. The results showed that the average available sulfur content was 45.24 mg/ kg, with the minimum of 3.26 mg/kg and the maximum of 1 296.85 mg/kg. The available sulfur content of most soil samples from all over the county was sufficient, the average available sulfur content was greater than 16 mg/kg, but in some areas of Ledong county the sulfur content was insufficient. The serious lacking of soil available sulfur （ con- tent 〈8 mg/kg） were mostly distributed in Qianjia town and Baoyou town, each accounted for 9.1% and 7.9%. The sulfur content was varied in different soil types, the consequent succession is as followed： coastal sandy soil 〉 fluvo - aquic soils 〉 torrid red soils 〉 paddy soils 〉 lateritic soils. Sulfur lacking ratio of lateritic soil was 34.46%. The research showed that there was obvious spatial variability of available soil sulfur content in this region.