EFFECTS OF DIFFERENT RESTORATION MEASURES ON SOIL ORGANIC CARBON COMPONENTS IN A CLEAR-CUTTING CHINESE PINE FOREST

In order to analyze effects of different restoration measures on the composition and stability of soil carbon pool, restoration communities in Chinese pine plantations of the Loess Plateau after clear-cutting were investigated. There were 3 types of restoration community (shrub land, abandoned forestland and young plantation land) and no clear-cutting forest as control (CK). The results showed that the soil total organic carbon (SOC), the high activity component (C1), the middle activity component (C2) and the content of stability component (C4) in the upper soil decreased firstly and then increased with the change of restoration measure, reaching the minimum value at SL, and had little effect on the SOC and its components of the lower soil. Restoration measures had little effect on the distribution ratio of different carbon components in total organic carbon and the activity coefficient of soil carbon pool, and C4 has the largest proportion among the four components, reaching 81.4 - 83.6%. Cl and C2 components can more sensitively reflect the effect of restoration measures on soil carbon pool. After clear-cutting, different restoration measures will affect the pH of soil and the content of ammonium nitrate nitrogen, thus affecting the components in the upper soil, and the properties of the lower soil will change with the leaching and other effects, thus affecting the active carbon components. Based on the stability of soil carbon pool, this study analyzed the effect of Restoration measures on the carbon pool composition in the forest soils in the loess hilly region, which is conducive to the understanding of the impact of forestry management measures on soil carbon pool processes.