Dynamic Characteristics Of Carbon Storage Of Main Tree Species In Broad Leaved Korean Pine Mixed Forest

In recent 100 years,with global warming,broad-leaved Korean pine forest,as the zonal climax forest vegetation type in the east of Northeast China,has great potential for carbon sequestration.Therefore,it is urgent to explore how to change the carbon storage of broad-leaved Korean pine mixed forest.Accurately quantifying the dynamic relationship between climate factors and forest carbon storage is an important problem to be solved in forest multi-objective management.Based on tree ring data,sample plot survey data and biomass allometric growth equation,I constructed the biomass dynamics which relates to diameter class of main tree species(Pinus koraiensis.,Acer mandshuricum Maxim.,Ulmus davidiana var.jaonica.,Acer mono Maxim.,Juglans mandshurica Maxim.and Fraxinus mandshurica),compared the carbon content of tree species with different density characteristics,and the discussed correlation between tree species physiological characteristics(wood density).Combined with the characteristics of climate change,the carbon storage dynamics and climate interpretation of main tree species in broad-leaved Korean pine forest were revealed.The main results are as follows:(1)There are significant differences in the biomass of main tree species in different development stages of broad-leaved Korean pine forest,which are affected by both diameter class factors and tree species characteristics.Among them,the single tree biomass of six tree species in large diameter class was significantly higher than that in small diameter class(P < 0.05),and the average annual growth rate of single tree biomass was significantly different among tree species.The biomass of Fraxinus mandshurica was the fastest,while Acer mandshuricum Maxim was the slowest,and the biomass difference of diameter class related individual trees had a stage.In the middle-aged forest,the growth rate of relative single tree biomass of large-diameter Pinus koraiensis,Acer mandshuricum Maxim.and Fraxinus mandshurica was lower than that of small-diameter class,while that of large-diameter class of Acer mandshuricum and Juglans mandshurica was higher than that of small-diameter class.In the near mature forest,the growth rate of relative single tree biomass of large diameter class of Acer mandshuricum and Juglans mandshurica was higher than that of small diameter class.The growth rate of large diameter class of Juglans mandshurica was basically the same,while that of Pinus koraiensis,Acer mono,Ulmus davidiana and Fraxinus mandshurica was lower than that of small diameter class.In the mature forest,the growth rate of relative single tree biomass of Acer mandshuricum,Pinus koraiensis,Juglans mandshurica,Acer mono and Ulmus davidiana in large diameter class was less than that in small diameter class,while that of Fraxinus mandshurica was higher than that of small diameter class.(2)The carbon content of wood is related to wood density,among them,the lower carbon content of Ulmus japonica and Juglans mandshurica is 44.17% and 44.62%,respectively,the highest carbon content of Pinus koraiensis with the lowest wood density is 53.39%,and the carbon content of Acer mandshuricum,Fraxinus mandshurica and Acer mono with the higher wood density is 45.54%,45.37% and 49.28%,respectively.(3)The carbon storage of main tree species in broad-leaved Korean pine mixed forest has no significant correlation with annual average temperature and annual precipitation,but is more sensitive to monthly climate factors.The correlation between single tree carbon storage and atmospheric temperature was the least affected by diameter class for trees with medium wood density(i.e.Juglans mandshurica and Ulmus japonica,while the annual correlation between carbon storage and temperature of trees with extreme wood density(Pinus koraiensis and Juglans mandshurica s)was easily affected by diameter class.In the late growing season,the correlation between the single tree carbon storage and precipitation of the tree species(Juglans mandshurica,Fraxinus mandshurica and Pinus koraiensis)was higher than that of the tree species(Acer mandshuricum,Acer mono and Ulmus japonica)with slow growth rate of carbon storage per tree,on the contrary with the non-growing season.