大兴安岭不同林草过渡区土壤碳库活度的研究

Study on the activity of soil carbon storage in different transitional area between forest and grass regions in Greater Khingan Mountains

为了研究大兴安岭森林过渡区活性有机碳库的分布特征,以森林、林线、树线过渡区为研究对象,选取了27个土壤剖面,分析了活性有机碳、碳库活度与环境因子之间的关系。结果表明:不同过渡区土壤活性有机碳的含量大小为森林>林线>树线,表层(0~10 cm)含量最高,随着剖面深度的增加,活性有机碳含量逐渐降低。碳库活度与活性有机碳含量变化一致。随着植被覆盖度的增加,土壤碳库稳定性逐渐减弱。碳库活度与海拔有负相关关系,与林分密度有显著的相关关系(P<0.05),与乔木生物量没有显著的相关关系。

In order to study the distribution features of the library of activated carbon, the Greater Khingan Mountains transition area, in the forest, the timberline, the tree line transitional area as the research object,the 27 soil profile were selected;the active organic carbon and the relationship between the carbon library activity and environmental factors were analyzed. The results showed that the transition zone soil active organic carbon content of different size for forest timberline tree line, timberline surface（0~10 cm） the highest levels, along with the increase of the depth profile active organic carbon content decreases gradually. Carbon library activity consistent with active organic carbon content changes.With the increase of vegetation coverage, soil carbon library stability gradually. Carbon library activity has negative relationship with altitude, and stand density have a significant correlation（P0.05）, and there was no significant correlation between arbor biomass.