湖南桔园土壤硫素含量及其影响因素研究

On Sulphur Content of Soil in Citrus Gardens of Hunan Province and Factors Affecting it

为掌握湖南柑桔园土壤硫素含量的丰缺程度、分布规律及影响土壤硫有效性的因素,采取野外调查与室内分析相结合的方法,于2000-2002年对湖南江永、洪江、桃源、石门、衡山等9个县(市)45个柑桔园土壤硫素含量进行了调查测定.结果表明:湖南省柑桔园0～20cm土层有效硫2.5～219.2mg/kg,低于临界值的桔园占15.6%,处于潜在缺硫的占13.3%.0～20,20～40,40～60cm土层有效硫平均含量分别为46.3,84.9,96.0mg/kg,全硫平均含量分别为0.236,0.193,0.181g/kg.有效硫的水平分布以衡山最高、江永最低、其他县(市)居中.柑桔叶片含全硫x2.45g/kg,约11%的柑桔园低于临界值.影响土壤有效硫含量主要有土壤全硫、土壤有机质、土壤类型及土壤质地等因素.在缺硫和潜在缺硫的桔园土壤中应重视硫肥的施用,以促进柑桔产量和品质的提高.

To master sufficiency or deficiency of citrus gardens in Hunan Province,distribution law of soils S content,and factors to affect effective property of soil S.In 2000-2002,the authors investigated and determined soil S element content of 45 citrus gardens,in Jiangyong,Hongjiang,Taoyuan,Shimen,Hengshan etc.9 counties(cities) of Hunan Province including.Results show, 0～20 cm soil layer soil of citrus gardens in Hunan Province contains effective sulphur 2.5～219.2 mg/kg, with 15.6% of citrus gardens lower than critical value level, and 13.3% of citrus gardens at latent deficiency of S.The content of effective sulphur of 0～20,20～40,40～60 cm soil layer soil is ively 46.3,84.9 and 96.0 mg/kg, respectively; Total sulphur content is 0.236,0.193 and 0.181 g/kg, respectively.With the highest disdribution on Hengshan County and S lowest in Jiangyong County.Total S content of citrus leaves x2.45 mg/kg,citrus gardens of about 11% lower than critical value. Factors affecting soil content of effectives content mainly include soil total S,soil O.M,soil type and soil texture etc. Fruit farmers are to pay attention to application of sulphur fertilizer to citrus garden soil of deficiency S and latent deficiency S in order to promote raise yield and quality of fruit.