简介：根流出物，微生物殖民和土壤总数一起形成rhizosheath，微生态系统的遵守的特殊柱体根表面。为了学习rhizosheath怎么影响，玷污结构和滋养的分发，我们在壶和地实验在土壤粒子尺寸和滋养的可获得性上分析了玉米rhizosheath的影响。结果证明有在rhizosheath的土壤粒子的重要尺寸减少。同时，在rhizosheath的土壤矿物质氮在tasseling和玉米的成熟阶段在根围或体积土壤比那显著地高。Fe和Mn的内容也是在rhizosheath改变的差别。Rhizosheath开发，由rhizosheath土壤的干燥重量比率显示了到根，在整个试验性的时期期间相对独立于根开发。玉米rhizosheath的形成贡献了土壤粒子尺寸和滋养的可获得性的调整。物理的土壤和化学性质的微妙的本地变化可以在植物进化和驯服的长历史上在土壤形成，rhizospheric生态系统开始，和矿物质营养素动员上有深刻影响。

简介：Therelationshipbetweenmagneticpropertiesandparticlesizeofsoilsderivedfrommetamorphicrock,basalt,granite,Quaternaryredclay,limestoneandmudstonefromZhejiangProvince,EastChinawasstudied,Basedonthevariationsofthemassmagneticsusceptibility(χ),anhystereticremanentmagnetization(ARM),andsaturationisothermalremanentmagnetization(SIRM)withsoilparticlesize,therelationshipcouldbeclassfiedintothreegroups.Forthesoilsderivedfrommetamorphicrockandbasalt,magneticvalueswerethehighestinthegravelandcoarsesandfractionsanddecreasedwithdecreasingsoilparticlesize.Thesoilsderivedfromsedimentaryrockhadabimodaldistributionofmagneticvalues.withpeaksin1-0.5and0.005-0.0005mmfractions.Thesoildevelopedongranitewascharacterizedbyapeakofmagneticvaluein0.001-0.0005mmfractions.Thesoildevelopedongranitewascharacterizedbyapeakofmagneticvaluein0.001-0.0005mmfractions.Frequency-dependentsusceptibility(χfd)andratiosofmagneticparameters(ARM/χ,SIRM/χandSIRM/ARM)ofsoilparticlefractionsshowedthatvariationsinferrimagneticgrainsizeparalleledthoseinparticlesize,χfdpeakedincalyfractionanddecreasedwithincreasingparticlesize,irrespectiveofsoilparentmaterials.TheacquisitioncurvesofIRManddemagnetizationparamenterofdifferentsoilparticlesindicatedthatthereweredifferentmagneticmineralsassemblagesindifferentparticlefractions.