Study On Soil Characteristics And Soil Taxonomy In Zagunao River Terraces Of The Upstream Of Minjiang River

This thesis for analysis of soil physical and chemical properties of profiles in Zagunao river terraces of the upstream of Minjiang River.Through soil color,soil structure,new bodies,frequency magnetic susceptibility,EC,particle size distribution,pH,CaC03,SOC,TN,TP,AP,TK,AK,TFe,Fed and Fe0 to analysis of soil specific.According to the Chinese soil Taxonomy(3rd edition),this study choose eight profiles of Zagunao river terraces soil to figure out which type does the bleached in Zagunao river terraces of the upstream of Minjiang River province belong to.1.The hue of soil is mainly 7.5YR and 10YR;the chroma of dry soil is maily 6,the chroma of wet soil is maily 4;the brightness of dry soil is maily 3,the brightness of wet soil is maily 2,3,4.The clay content in 12.0?28.0%,thesilt contentin 40.0?55.4%,the sand content in 23.6?45.8%;The particle size distribution isnot consistent changes in the profile.The texture of surface horizons is mainly silt loam,the texture of profiles is mainly loam soil.The high frequency mass magnetic susceptibility in 22.46?252.02×10-8 m3 kg-1,the low frequency mass magnetic susceptibilityin 22.35?272.60 ×10-8 m3 kg-1,the frequency magnetic susceptibility in 0.26?7.55%,isnot consistent changes in the profile.2.The CEC in 3.52?30.83 cmol kg-1,isnot consistent changes in the profile.The pH in 7.37?8.82.CaCO3 in 66.52?132.87 g kg-1,pH=4.3253×CaCO30.1381,the Pearsoncorrelation coefficient is 0.604.The SOC in 1.64?61.45 g kg-1,the TN in 0.31?5.19 g kg-1,is consistent changes in the profile.The TP in 0.14?2.02 g kg-1,The AP in 1.20?9.37 mg kg-1,isnot consistent changes in the profile.The TK in 7.28?24.11 g kg~-1,The AK in 116.78?942.61 mg kg-1,isnot consistent changes in the profile.3.The TFe in 41.51?64.04 g kg-1,the Fed in 15.42?27.99 g kg-1,the Fed/Fe in 31.53?44.04%,the Feo in 0.60?4.44 g kg-1,the Feo/Fe in 1.38?7.10%.4.The Sa in 4.55?7.88,is consistent changes in the profile.The ba in 1.32?9.19,isnot consistent changes in the profile.The CIA in 12.12?58.78%,isnot consistent changes in the profile.5.The soil in this area is divided into the diagnostic surface horizons:Mollic epipedon,Ochric epipedon,Fimic epipedon.Thediagnostic subsurface horizons:Cambic hotizon,Agric hotizon,Argic hotizon,Calcic hotizon.The diagnostic characteristics:Ustic moisture regime,Udic moisture regime,Mesic temperature regime,Isohunmic property.They belong to 4order,5suborder,7 group,7subgroup.