Contents and relationships of soil organic matter and total nitrogen under different habitats in Jinfo Mountain

The contents of organic matter (OM), total nitrogen (TN) and C/N ratio of soil under different habitats in Jinfo Mountain were studied and the results showed that the order of OM content in 0 to 10 cm soil layer was west slope（108.088 g/kg）＞south slope (92.229 g/kg) ＞summit（89.727 g/kg）＞north slope (80.881 g/kg). The order of TN content was summit（6.482 g/kg）＞south slope （5.722 g/kg）＞west slope（4.355 g/kg）＞north slope (3.928 g/kg). The order of C/N ratio was west slope（24.82）＞north slope（20.59）＞south slope （16.12）＞summit (13.84). While in 10 to 20cm soil layer, the order of OM content was summit（93.895 g/kg）＞west slope（70.319 g/kg）＞south slope （67.970 g/kg）＞north slope (63.255 g/kg). The order of TN content was summit（5.528 g/kg）＞west Slope (4.055 g/kg) ＞south slope （3.867 g/kg）＞north slope (3.460 g/kg). The order of C/N ratio was north slope（18.28）＞south slope (17.58) ＞west slope (17.34) ＞summit (16.99). It could be concluded that the contents of TN and OM were different among different habitats, and TN and OM contents in 0 to 10 cm soil layer were more than that in 10 to 20 cm soil layer. Moreover, the relationship between TN contents and OM contents in different habitats were significantly positive correlated.