重度火干扰下不同恢复年限对土壤有机碳的影响

Effects of Different Restoration Years on Soil Organic Carbon under Severe Fire Interference

自然火干扰作为泰加林中最主要的自然干扰,是促进泰加林土壤碳循环的主要方式。为探讨火干扰对土壤有机碳的影响,以新疆喀纳斯地区重度火烧不同恢复年限的泰加林火烧迹地为研究对象,研究比较在重度火干扰下,火烧后不同恢复年限对土壤有机碳含量及碳储量的影响。结果表明：在不同恢复年限的同一土层中,只有火烧后52年的火烧迹地土壤有机碳含量与未火烧对照土壤存在显著差异（P〈0.05）,且不同恢复年限的0~10cm土层中的土壤有机碳含量均大于10~25cm土壤中的有机碳含量;不同恢复年限的火烧迹地中土壤碳储量均与对照土壤存在显著差异（P〈0.05）。本研究表明重度火干扰对土壤有机碳的影响较为持久。

Natural fire disturbance, acting as the main disturbance form in taiga forests, is the main way to promote soil carbon cycling in taiga forests. In this study, the effects of different burning years on soil organic carbon and carbon storage were studied under heavy fire disturbances in taiga forest of Xinjiang Kanas. The results show that in the same soil layer with different burning years, the soil organic carbon content being fired after 52 years was significantly different from that in the control soil （P〈0.05）, and the soil organic carbon content of 0-10 cm was higher than that in the soil of 10-25 era. The soil carbon storage in the burned areas under different burning years was significantly different from that of the control soil （P〈0. 05）. The suggests that the effect of heavy fire on soil organic carbon is lasting for a long time.