三江平原典型湿地土壤中硫的分布特征

本文以三江平原的三种典型类型湿地:小叶樟(Calamagrostisangustifolia)草甸、毛果苔草(Carexlasiocarpa)沼泽、乌拉苔草(Carexmeyeriana)沼泽为研究对象,对其土壤中硫的含量在水平及垂直变化方面进行分析。研究在自然环境下硫的分布特征。经过试验分析和数据处理,得出以下结论:总硫、水溶性硫、吸附性硫、盐酸可溶性硫、盐酸挥发性硫、有机硫含量均为小叶樟草甸<乌拉苔草沼泽<毛果苔草沼泽;别拉洪河、挠力河、鸭绿河、浓江是三江平原四条有代表性的沼泽性河流,流域土壤中的硫素含量为挠力河>鸭绿河>浓江>别拉洪河;在土壤层次上,具有明显的规律性:除盐酸挥发性硫以外,其余各硫组分自上而下含量呈递减趋势;在湿地土壤各形态硫中,有机硫是土壤总硫的主体,盐酸挥发性硫含量最低。总硫与有机硫相关性最显著,达极显著正相关(P=0.01),水溶性硫与盐酸可溶性硫的相关性最差。影响湿地土壤中硫素含量的因素为土壤有机质、土壤pH值、物理粘粒及氧化-还原条件。

The Distributing of Sulfur in Typical Wetland Soils in the Sanjiang Plain

ThreeimportantmarshtypesincludingCalamagrostisangustifoliamarsh ,CarexlasiocarpamarshandCarex meyerianamarshwerestudied .Thehorizontalandverticaldistributionofvariousformsofsulfurinthesewetland soilswasdiscussed .Naturalenrichmentanddistributioncharacterizationofsulfurformsinsoilswereresearched .The resultsindicatethatthecontentsoftotalsulfur ,watersolublesulfur,extractablesulfur ,HClsolublesulfur,HCl volatilesulfurandorganicsulfurinthethreemarshsoilswereallCalamagrostisangustifoliamarsh YaluValley >BielahongValley >NongjiangValley .ExceptHClvolatilesulfur,theothersulfurfractionsinthemarsh soilspresentdedistinctcharacter :graduallydecreasingfromuptobottom .Ofallsulfurfractions ,thecontentof organicsulfurwasmuchmorethantheothersinsoilandHClvolatilesulfurwasmuchlessthantheothers.The correlationbetweentotalsulfurandorganicsulfurwasmostremarkable ,andthecoefficientofwatersolublesulfur andHClsolublesulfurwaslowest.Themajorconstraintsaffectingthecontentsofsulfurfractionsinthesoilswere organicmatter ,pH ,physicalparticlesandredoxenvironment.