长期定位施肥紫色土无机硫形态变化  

Variation of inorganic sulfur forms under long-term fertilization in purple soil

作　　者：钟海夫 张思兰[1] 郭涛[1] 石孝均[1] 

机构地区：[1]西南大学资源环境学院,重庆400716

出　　处：《植物营养与肥料学报》2015年第6期1652-1656,共5页Journal of Plant Nutrition and Fertilizers

基　　金：国家科技支撑计划项目(2012BAD05B03);农业部公益性行业科研专项(201203030);中央高校基本科研业务费专项(XDJK2010B012)资助

摘　　要：【目的】以紫色土肥力与肥料效益监测基地的土壤为研究对象研究了长期（22年）不同施肥（不施肥对照、施用氮磷钾、单施有机肥、氮磷钾与有机肥配施、永久休闲）处理对表层土壤（0-20 cm）硫含量的影响,为合理进行硫素供应和肥料施用提供理论依据。【方法】利用连续提取法提取耕层土壤的水溶性硫、吸附性硫、HCl溶性硫和总硫,并用BaS04比浊法进行测定。【结果】化肥与有机肥长期配施能显著增加土壤的总硫含量,与原始土壤相比增加65.42 mg/kg但有效硫比例低于单施化肥处理;与原始土壤相比5个处理的水溶性硫含量都有所下降幅度为0.87-1.38 mg/kg;而单施有机肥或化肥与有机肥配施能显著增加土壤的吸附性硫含量分别比原始土壤增加93.3%和177.4%;长期施用氮磷钾化肥能显著增加土壤HCl溶性硫含量,比原始土壤增加了161.7%。【结论】单施化肥或有机肥化肥配合施用都能显著增加土壤硫的供给,而有机肥与化肥配施更有利于土壤硫的累积。此外,长期施肥试验表明大气硫沉降的减少对土壤硫供给的影响需值得进一步关注。[Objectives]A field experiment was established in 1991 in the Long-term Monitoring Network of Purple Soil to investigate effects of long-term fertilization on sulfur（S） with different forms in the soil.The soil samples were collected from the topsoil（0-20 cm） that were treated with no fertilizers（CK）,nitrogen,phosphorus and potassium fertilizers（NPK）,organic manures（M）,NPK plus organic manures（NPKM） and no cultivation（F）.[Methods]The samples were successively extracted to determine the contents of H_2O-S,absorbed-S,HC1-S and total S which were analyzed by the barium turbidity method.[Results]The contents of soil total S was increased by65.42 mg/kg in NPKM compared with the origin samples,while the ratio of available S in NPKM was lower than that in NPK.The content of soil adsorbed-S was improved by 177.4%and 93.3%in NPKM and M compared with the origin samples.Compared with the origin samples,the H2O-S contents of all treatments were decreased by in a range of 0.87-1.38 mg/kg.The content of HC1-S was increased by 161.7%in NPK.[Conclusions]The longterm NPK fertilization and NPK plus manure fertilization could significantly increase the availability of S in purple soil,and the NPKM treatment is in favour of S accumulation in soil.In addition,the results from the long-term experiment indicate that the decrease of S input from atmospheric deposition should be concerned.

关 键 词：紫色土 长期施肥 硫 形态 

分 类 号：S158[农业科学—土壤学]