Abstract:Through field investigation and experiment analysis,the soil nutrient status under three types of forests including artificial pure forest,mixed forest and natural forest of Pinus koraiensis and at different levels are analyzed.Results showed that there was significant difference among the nutrients in different foresttypes.For the same forest type,the nutrients all declined with the increase of soil depth,and the organicmatter content as well as the total and available contents of nutrients reached highest value in soil layer of 0- 15cm.As a whole,the nutrients in natural forest of Pinus koraiensis were highest,followed by mixed forestand pure forest.In the three forest types,the kalium content was rich and the total phosphorus contentmaintained a low level.The pH value declined slowly and the soil in pure forest of Pinuskoraiensishad anacidification trend,with pH values ranging from 5.08to 5.37.Therefore,regeneration in pure forest ofPinuskoraiensisshould be carried out in time to reduce and prevent soil nutrient loss.