Effects of tree species importance,diversity and soil physicochemical properties on soil amino sugars
[Objective]Soil amino sugars are specific markers of soil microbial death residues,and play an important role in soil carbon and nitrogen sequestration.This study aims to explore the impact mechanism of tree species diversity and dominant tree species importance on soil amino sugars.[Method]The experimental forest farm of Northeast Forestry University was taken as the research sample,and 0-20 cm surface soil was used to measure glucosamine(Glu),galactosamine(Gal),muramic acid(Mur)and total amino sugar(TA).The diversity index of tree species and important values(Ⅳ)of dominant tree species were calculated.The main factors and contribution affecting soil amino sugars were determined through correlation analysis,redundancy analysis,and variance decomposition analysis.[Result](1)The contents of Glu,Gal,Mur,TA were significantly positively correlated with those of total nitrogen(TN),electrical conductivity(EC),and organic carbon in soil(P＜0.05).(2)The contents of Glu,Gal,Mur,TA were significantly negatively correlated with Ⅳof Pinus tabulaeformis var.mukdensis(P＜0.01).The contents of Glu,Gal,TA were negatively correlated withⅣ of Quercus mongolica(P＜0.05).The contents of Glu and TA were significantly positively correlated withⅣ of Phellodendron amurense,Lonicera maackii,and Juglans mandshurica(P＜0.05),while the contents of Ga,Mur and TA were significantly positively correlated with Ⅳ of Acer negundo(P＜0.05).Redundancy analysis found that Pinus tabuliformis var.mukdensis and Q.mongolica were not conducive to the accumulation of amino sugars,while A.negundo,Phellodendron amurense,L.maackii,and J.mandshurica were conducive to the accumulation of amino sugars.(3)Variance decomposition analysis showed that the contribution of Ⅳ of tree species to changes in soil amino sugar content(35.4％)was significantly higher than that of tree species diversity(6.4％)and soil physical and chemical properties(17.2％).[Conclusion]The rich diversity of tree species maintained by increasing tree species such as A.negundo,L.maackii,Phellodendron amurense and J.mandshurica can better promote the accumulation of amino sugars in soil and improve soil carbon and nitrogen sequestration capacity.[Ch,2 fig.7 tab.24 ref.]
species diversityimportant value of tree speciessoil propertiessoil amino sugars
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