以思茅松人工林中龄林、近熟林和过熟林及附近区域思茅松天然林和常绿阔叶林为研究对象,探讨造林对思茅松人工林土壤有机碳和氮储量大小与空间分布的影响。结果表明:各林地类型土壤有机碳、氮含量与C:N随着土层厚度增加而减少,过熟林土壤有机碳和氮含量随土层加深则显著高于其它林地类型,近熟林土壤表层有机碳和氮含量显著低于中龄林和过熟林。思茅松人工林乔木层碳储量随林龄增大而增加,过熟林乔木层碳储量最高。造林对思茅松人工林土壤氮储量的影响不显著,而土壤有机碳储量随林龄增大先减少后增加至过熟林恢复至常绿阔叶林和思茅松天然林水平,土壤有机碳与氮储量随土层加深而减少。与常绿阔叶林和思茅松天然林相比,思茅松人工林的中龄林与过熟林土壤有机碳和氮储量的年变化量高于近熟林,近熟林年变化量呈净减少;在思茅松天然林中,人工更新与在常绿阔叶林中造林相比,思茅松人工林可以累积更多的土壤有机碳和氮储量。此外,土壤含水量越大,土壤有机碳储量则越高。 The effects of afforestation on soil organic carbon and nitrogen storage and spatial distribution in Pinus kesiya pine plantations were studied with middle-aged stands, mature and over-aged stands and over-mature stands and the nearby natural and permanent evergreen broad-leaved forests . The results showed that soil organic carbon and nitrogen contents and C: N decreased with the increase of soil thickness in all types of forest land. Soil organic carbon and nitrogen content in over-mature forests were significantly higher than those in other woodland types, Surface organic carbon and nitrogen content was significantly lower than the middle-aged forest and over-mature forest. The carbon storage of arbor layer in Pinus kesiya varchar plantation increased with the increasing of age, and the carbon storage in arbor layer was the highest. The effect of afforestation on soil nitrogen storage of Pinus kesiya var. Langbianensis plantation was insignificant, but the soil organic carbon storage decreased first and then increased to overmature forest, then restored to the level of natural evergreen broadleaved forest and Pinus kesiya forest, soil organic carbon and Nitrogen reserves decreased with deeper soil layers. Compared with the evergreen broadleaved forest and the natural plantation, the annual variation of soil organic carbon and nitrogen in the medium-aged and over-aged stands of Pinus rigatus plantation was higher than that in the near-mature forest, and the net annual change of near-mature forests was net ; Artificial regeneration in the natural plantation of Pinus kesiya var. Angustifolia plantation could accumulate more soil organic carbon and nitrogen reserves compared with the plantation in the evergreen broad-leaved forest. In addition, the greater the soil moisture, the higher the soil organic carbon stocks.