Studies On Decomposition Effect Of Mixed Leaf Litters From Pinus Sylvestris Var.Mongolica And Common Tree Species In Horqin Sandy Land

The Pinus sylvestris var.mongolica plantation forest has occurred large-scale decline phenomenon,which has seriously affected the stability and sustainability of the artificial forest ecosystem.One of effective way to solve the problems is to choose suitable mixed tree species to build P.sylvestris var.mongolica mixed forest.In this paper,the decomposition characteristics of mixed leaf litters from P.sylvestris var.mongolica and common tree species and their impacts on soil nutrients is studied through the mixed leaf litters decomposition experiment.From the perspective of mixed leaf litter decomposition,select the optimal mixed tree species suitable for P.sylvestris var.mongolica.The research conclusions are as follows:Leaf litters mixed decomposition from P.sylvestris var.mongolica and Acer mono inhibitted C?K?Mg and Zn release,and promoted N?P and Ca release.Leaf litters mixed decomposition from P.sylvestris var.mongolica and Maackia amurensis inhibitted C?Mg and Zn release,and promoted P?K?Ca and Mn release,while it had no effect on N release.Leaf litters mixed decomposition from P.sylvestris var.mongolica and Armeniaca sibirica inhibitted C ? K ? Mg and Zn release,and promoted N ? P ? Ca and Mn release.Leaf litters mixed decomposition from P.sylvestris var.mongolica and Syringa reticulata var.amurensis promoted N?P?Ca?Mg and Mn release,while it had no effect on C and K release.Leaf litters mixed decomposition from P.sylvestris var.mongolica and Amorpha fruticosa promoted C?N?P?K?Ca and Mn release,and inhibitted Mg and Zn release.Leaf litters mixed decomposition from P.sylvestris var.mongolica and Hippophae rhamnoides promoted C?N?P?K?Ca?Mg?Fe?Zn and Mn release.Soil organic carbon content increased under leaf litters mixed decomposition from P.sylvestris var.mongolica and A.mono,M.amurensis,Vitex negundo L var.heterophylla,H.rhamnoides.Soil catalase and phosphatase activity decreased under leaf litters mixed decomposition from P.sylvestris var.mongolica and A.mono,while it increased under leaf litters mixed decomposition from P.sylvestris var.mongolica and M.amurensis,S.reticulata var.amurensis,H.rhamnoides.Soil saccharase activity decreased under leaf litters mixed decomposition from P.sylvestris var.mongolica and A.mono,M.amurensis,S.reticulata var.Amurensis,while it increased under leaf litters mixed decomposition from P.sylvestris var.mongolica and H.rhamnoides.Soil urease activity increased under leaf litters mixed decomposition from P.sylvestris var.mongolica and A.mono,M.amurensis,A.sibirica.Soil protease activity increased under leaf litters mixed decomposition from P.sylvestris var.mongolica and M.amurensis,S.reticulata var.amurensis,H.rhamnoides.Based on the comprehensive analysis of nutrient release from litter decomposition and its effect on soil nutrients,S.reticulata var.amurensis and H.rhamnoides were optimal mixed tree species for P.sylvestris var.mongolica.