Influence Of Mixing Proportions On Carbon Storage And Allocation In Mixed Plantation Of Larix Olgensis And Fraxinus Mandshurica

In this study,four types of mixed Larix olgensis and Fraxinus mandshurica plantations were selected according to the rows-mixing proportions（typeⅠ:5:3,typeⅡ:6:4,typeⅢ:5:5,typeⅣ:1:1）.The seemingly unrelated biomass models of L.olgensis and F.mandshurica were developed for obtaining biomass values,Calculate the biomass,carbon content and carbon storage of each component in each type of stand,and the difference and composition of carbon storage in each forest layer and ecosystem were analyzed.The results show:（1）The carbon storage in the arbor layer of the four types of mixed forests is type IV>I>II>III in descending order.The interbreeding ratio significantly affected the carbon storage in the arbor layer,and the carbon storage in the arbor layer was not significantly different among types I,II and IV（P>0.05）,but was significantly different from type III（P<0.05）.The distribution of carbon storage in each organ in the arbor layer is stem>root>branch>leaf.（2）The carbon storage in the understory vegetation layer of the four types of mixed forests is type II>IV>I>III in descending order.The mixing ratio significantly affected the carbon storage in the understory vegetation layer.The carbon storage in the understory vegetation layer of type II was significantly higher than that of other types（P<0.05）,and there was no significant difference between the other three stand types（P>0.05）.Herbs are the main body of carbon storage in the understory vegetation layer,accounting for 78.1%to 86.9%of the carbon storage in the understory vegetation layer.（3）The carbon storage in the litter layer of the four types of mixed forests is type III>II>I>IV in descending order.The intermixing ratio significantly affected the carbon storage in the litter layer.The carbon storage in the litter layer was not significantly different between types II and III,and between types I and IV（P>0.05）,but was significantly higher than that between types I and IV（P>0.05）.Ⅳ（P<0.05）.Semi-decomposition is the main body of carbon storage in the understory vegetation layer,accounting for 65.2%to 73.9%of the carbon storage in the litter layer.（4）The carbon storage in the soil layer of the four types of mixed forests is type II>III>I>IV in descending order.There were significant differences in soil storage among the four stand types,and the soil carbon storage of type II was significantly higher than that of the other types（P<0.05）,and there was no significant difference among the other types（P>0.05）.（5）In the whole ecosystem,the carbon storage of typeⅠ～Ⅳwere 90.43,108.27,85.83and 89.92 t·hm^-2,and the carbon storage of the four types of mixed forest ecosystems from large to small is type II>I>IV>III.The proportion of ecosystem carbon storage in each forest layer is in descending order:tree layer（43.3%～55.7%）>soil layer（38.7%～50.5%）>litter layer（4.9%～8.1%）>forest The lower vegetation layer（0.1%～0.3%）,tree layer and soil layer are the main parts of ecosystem carbon storage.The mixing ratio had a significant effect on the ecosystem carbon storage,and the ecosystem carbon storage of type II was significantly higher than that of the other stand types（P<0.05）,but the difference was not significant among the other stand types（P>0.05）.In this paper,the carbon storage of four kinds of mixed forests with different mixing ratios of L.olgensis and F.mandshurica was studied,which provided scientific basis for the scientific establishment and management of mixed forests.It is suggested that in the future afforestation,alternate planting of 6 rows of L.olgensis and 4 rows of F.mandshurica.