Divergent Changes Of Soil Organic And Inorganic Carbon And Their Influences On Soil Physicochemical Properties

Soil organic and inorganic carbon, as two kind of soil carbon existence form, could influence soil carbon sequestration in larch growth and land use process, but it little about the SOC and SIC research in same time. Through to feld experiment, interior control experiment and review the previous studies, this article were quantitative the impact of soil organic, soil component and soil inorganic, soil CO2absorption mechanism of forest and saline-alkali soil, and the difference impact of organic and inorganic in land use in a large area, we concluded:1) High SOC storage (15.23kg m-2) and low SIC storage (86.2g m-2on average) is a main feature in DaiLing forest region. Significant decreases in the SIC ratio but evident increase in the SOC ratio between0-40cm and40-80cm were observed with the increases in larch age (SIC:slope=-0.149; SOC:slope=0.097), tree size (SIC:slope=-0.05; SOC slope=0.0376) and biomass density (SIC:slope=-0.088; SOC:slope=0.0673). SIC was significant positive correlation with soil pH and was significant negative correlation with soil EC; however, SOC were significant positive correlation with soil nitrogen, available-N and EC, but was significant negative correlation with soil effective silicon and bulk density. Our results indicate that SOC and SIC was significant negative correlation and had a different affect on soil physicochemical properties.2) The change of soil organic carbon content and its components were different in soil layers. In the vertical profile, SOC, SON, DOC and DON in surface soil layer were significantly higher than those in the deep soil layers (P<0.05), while no significant differences were found in SUVA254, SUVA260, SUVA272and SUVA280(P>0.05); During of the development larch plantation, DOC, SOC and SON at the surface soil (0-20cm) linearly increased with larch age (P<0.05), while no significant changes were observed in deep soils. The relation between SOC, DON, SON and the absorbance values indicated that decrease in top soil was much steeper than that in sub-soils.3) By joining CaCO3、Na2CO3、NaHCO3、MgSO4、CaSO4、2CaO·SiO2six soil common compounds, we found that forest soil and saline-alkali soil could directly absorption CO2form atmosphere by SIC which was formed from soil. After simulation Precipitation, most of soil which contains salt was become carbon sequestration form carbon source that showing the importance of water. Form time of soil absorption CO2, the forest and saline-alkali soil could fixed CO2from atmospheric for long time when it content the2CaO·SiO2. Considering our country building were form by2CaO·SiO2and which have potential of absorption CO2form atmospheric by improving existing soil.4) Through analysis the effect of soil organic and inorganic carbon on soil carbon sequestration and physicochemical properties, we conclude that soil organic and inorganic carbon had different impact on soil physicochemical properties which including pH, total nitrogen, alkaline-hydrolyzed N, total phosphorus, available P and K, K+, mineral contents of Fe2O3, P2O5, Al2O3, CaO, Na2O, and SiO2. Moreover, results showed a17%increase in SOC and a24%decrease in SIC on average after managements on farmland, grassland and forest. Therefore, we should consider SOC and SIC at the same time in soil carbon sequestration.