Abstract: During the growth season of wetland plant in the Sanjiang Plain,a representative peat mire soil developed in the Carex lasiocarpa-Glyceria spiculosa wetland was chosen as the object of the study.The soil was sampled layer by layer monthly and their P and K concentrations and correlative environmental factors were measured synchronously.Based on these data,with SPSS software and gray relating analysis means,characteristics of P and K profile concentrations and degrees they were influenced to under their affecting factors in the peat mire soil have been discussed.The results indicate that P and K concentrations in the profile show an obvious phenomenon of stratification along the vertical direction,the good quadratic relativities between P or K concentration and soil layer with correlation coefficients above 0.94 except in the gley layer.The readily available P and readily available K concentrations of each soil layer displayed an obviously dynamic variation during the plant growth season.Their one-factor thrice non-linear regression simulations performed ideally.The same environmental factor did not affect the total P,total K,readily available P and readily available K in the same layer to the same extent,and it also varied in its influence coefficient with P and K in different soil layers.Consequently,there is no doubt that different environmental factors would certainly have different influence coefficients with the same object in the same soil layer.

Key words: nutrient element, environmental factor, peat mire soil, Sanjiang Plain