Effects of Different Restoration Models on Soil Carbon and Nitrogen Stoichiometry in Junzhaigou Earthquake-stricken Landslides

According to the comparison of soil carbon and nitrogen stoichiometry characteristics between natural restoration after earthquake (NR), artificial restoration after earthquake (AR) and natural vegetation without earthquake (CK) in Jiuzhaigou country, it could provide theoretical basis for rapid restoration of landslide damaged by Jiuzhaigou earthquake. The results showed that: (1) Compared with the soil without earthquake damage, the contents of soil organic carbon (SOC), total nitrogen (TN), available nitrogen (AN) in landslides with earthquake-damaged vegetation were lower than that on CK, but the pH value and C/N were higher. (2) The total vegetation coverage, SOC, TN and AN contents under artificial restoration were higher than those under natural restoration. (3) SOC was positively correlated with TN or AN, but negatively correlated with pH or C/N. These short-term results indicated that artificial restoration was better for vegetation recovery of earthquake-stricken landslides than natural restoration. In addition, it is suggested that nitrogen-fixing plants should be planted in the future vegetation restoration.