| Research on forest soil organic carbon is to control the global climate change is an important work..This article Selected temperate regions the Changbai Mountain and Xiao Xing An Ling Mountains three typical forest types:coniferous forest, mixed broadleaf-conifer forest and secondary broad-leaved forest soil as the research object, through research forest type on soil particles organic carbon, and light fraction organic carbon and heavy fraction organic carbon distribution features of effect, revealed a temperate forest soil organic carbon distribution in response to different succession stages of forest types, and explored the stability classification of forest soil organic carbon composition. The main results were as follows:1.Different forest types in Changbai mountain and Xiao Xing An Ling Mountains soil organic carbon content in soil layer depth increased with reduced.Forest soils in Changbai mountain region, surface A11in the humus layer and subsurface A12content change trends was the same, mixed broadleaf-conifer forest> coniferous> secondary broad-leaved forest. Xiao Xing An Ling Mountains areas of soil, surface A11of the humus layer content of mixed broadleaf-conifer forest> secondary broad-leaved forest> coniferous forest, humus content of organic carbon in subsurface A12broadleaved> coniferous> secondary broad-leaved forest, the stands of3kinds of differences were not significant.2. Changbai Mountain and Xiao Xing An Ling Mountains forest soil particulate.fraction component contents were higher in the A11layer. Different forest types in the surface layer of particulate organic carbon concentrations were higher than the subsurface. The distribution ratio of particulate organic carbon and soil organic carbon content had a significant positive correlation (P<0.05). Two regions mixed coniferous higher particulate organic carbon content of different forest types of particulate organic carbon allocation ratio:coniferous forest> mixed broadleaf-conifer forest> secondary broad-leaved forest, Xiao Xing An Ling Mountains mixed broadleaf-conifer forest> coniferous forest> broad-leaved forest, the results showed that the late-succession secondary broad-leaved forest in particulate organic carbon allocation than the minimum, reduced the stability of the soil organic carbon, the highest stability of origin coniferous forest particulate organic carbon. In the process of forest succession, mixed broadleaf-conifer forest part of particulate organic carbon in the soil compared to the high content of other succession stages forest system in the course of evolution, soil structure changed directly affect the quality and quantity of the grain component, coniferous forest in a succession of mid-term carbon absorption capacity of the soil layer, more by natural factors and human activities affect the decomposition of part of the organic carbon in the soil particles. Changbai Mountain native coniferous forest-like particle component proportion and organic carbon content higher than Xiao Xing An Ling Mountain artificial larch mainly coniferous forest plots, therefore, strong in the secondary forest of native forest system stability, reducing native forest area the damaged could be more effective to strengthen the role of the forest ecosystem carbon sequestration.3.The Changbai Mountain forest soil of different forest types in the light fraction organic carbon content of conifer and broadleaf mixed broadleaf forest surface were significantly higher than subsurface coniferous forest surface and subsurface, the difference was not significant. Light fraction component of soil quality proportion in the A11were higher than A12layer.. Xiao Xing An Ling Mountains forest soils in different forest types light fraction organic carbon content of the surface of the coniferous and mixed coniferous were significantly higher than the sub-surface, the broadleaf forest surface and subsurface was not significantly different, and particulate organic carbon significantly the same. Changbai Mountain forest-type surface concentration above the subsurface the coniferous forest Xiao Xing An Ling Mountains and broadleaf surface concentration higher than the surface showed that coniferous Xiao Xing An Ling Mountains forest and broadleaf forest soil leaching significantly, high-quality light fraction and changed in the external environment on the surface of the impact was greater than the subsurface, positive correlation between the distribution of light fraction organic carbon than the soil organic carbon content significantly. Mixed conifer forest types in Changbai Mountain and Xiao Xing An Ling Mountains showed high contribution of soil organic carbon light fraction organic carbon, and the same trend, indicating that the light group:mixed broadleaf-conifer forest and coniferous forests> secondary broad-leaved forest pointed the lowest stability in mixed broadleaf-conifer forest, after the succession and stability increased. Impact Xiao Xing An Ling Mountains coniferous and broad-leaved forest light fraction organic carbon content directly factors the Light group component quantity rather than quality, and impact on coniferous forest particulate component concentrations directly for different reasons, the quantity and quality of the soil component could affected the components of organic carbon content.4. Changbai Mountain forest soil organic carbon content in different forest types in surface and subsurface the heavy fraction were no significant differences between the various forest types. The heavy fraction of the organic carbon content of broadleaf forest surface was significantly higher than the subsurface. Soil mass proportion of the heavy fraction in A11was higher than that in A12layer. The soil subsurface heavy fraction matter content were higher than the surface, the surface heavy fraction substances content in the order of coniferous forest> broad-leaved forest> mixed broadleaf-conifer forest. Subsurface order was broadleaf forest> mixed broadleaf-conifer forest> coniferous forest. The forest soil in Xiao Xing An Ling Mountains different forest type A11layer.A12heavy fraction of the organic carbon content of coniferous forests with broad-leaved forest surface were significantly higher than the sub-surface, the mixed broadleaf-conifer forest surface and subsurface were no significant difference. The subsurface heavy fraction material content was higher than the surface of the soil, which showed that the surface soil organic carbon stability above the surface, mixed broadleaf-conifer forest lowest soil stability. The heavy fraction component was the stability of the components of the soil in the soil by the soil particles of strong protective effect. Heavy fraction organic carbon allocation proportion than a significant positive correlation relationship with the soil organic carbon content, restructuring the distribution of organic carbon than a significant positive correlation relationship with the soil organic carbon content, the correlation coefficients were higher than the light fraction organic carbon of the distribution ratio reorganization of organic carbon in carbon allocation also determined the level of intensity of soil organic carbon stability, Changbai Mountain and Xiao Xing An Ling Mountains heavy fraction component carbon in the same trend as the changed in the distribution of the different forest types:broad-leaved forest> coniferous forest> coniferous mixed forest. Therefore, the process of transformation of forest types, the carbon sequestration capacity of the soil organic carbon will change, coniferous and mixed forest phase of soil carbon sequestration capacity minimum carbon sequestration capacity will be stronger with the succession.5.Comprehensive comparison of the various forest types, coniferous forest surface and subsurface particles of carbon and reorganization of carbon concentration were the corresponding total soil organic carbon concentration had a significant relevant relationship, and particulate carbon and reorganization of carbon-related relationship also was significant with surface light group correlation coefficient not significantly higher than subsurface restructuring component concentrations in different soil correlation coefficient, subsurface reorganization carbon accumulation effect was more obvious. |
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