In order to investigate the difference of artificial sand-fixation forest models on soil organic carbon (SOC)

taking the soil as the research object under the 5 forest models in Zhanggutai sandy land of Liaoning province. We compared the distribution characteristics of SOC

nitrogen

and humus in 0—5 cm

5—10 cm

10—20 cm

and 20—40 cm soil layers through statistical methods. The results showed that the change of SOC content was as follows: Pinus sylvestris pure forest (4.72 g/kg)＞Mixed forests of Maackia amurensis and Pinus sylvestris (4.48 g/kg)＞Mixed forests of Elm and Pinus sylvestris (4.38 g/kg)＞Mixed forests of Spruce and Pinus sylvestris (4.21 g/kg)＞Poplar forests (3.95 g/kg)＞CK (1.88 g/kg) in 0—40 cm soil layer; The comparation of organic carbon storage was expressed as: Mixed forests of Maackia amurensis and Pinus sylvestris (20 t/hm2)＞Pinus sylvestris (19.92 t/hm2)＞Mixed forests of Spruce and Pinus sylvestris (19.06 t/hm2)＞Mixed forests of Elm and Pinus sylvestris (17.31 t/hm2)＞Poplar forests (16.61 t/hm2)＞CK (8.44 t/hm2); The analysis of humus components found that soil humus carbon content was expressed as: Mixed forests of Spruce and Pinus sylvestris (2.04 g/kg)＞Mixed forests of Elm and Pinus sylvestris (1.93 g/kg)＞Pinus sylvestris (1.74 g/kg)＞Poplar forests (1.65 g/kg)＞Mixed forests of Maackia amurensis and Pinus sylvestris (1.55 g/kg)＞CK (0.75 g/kg). There were significant positive correlations between SOC and total nitrogen

humic carbon

humic acid

fulvic acid

humic acid/SOC

and fulvic acid/SOC.