三江平原泥炭沼泽土剖面P、K养分分布特征及影响因素分析

Characteristics of P and K distributions and their affecting factors in the peat mire soil profiles in the Sanjiang Plain

在三江平原湿地植物生长季节 ,选择具有代表性的毛果苔草 -狭叶甜茅 (Carexlasiocarpa Glyceriaspiculosa)湿地发育的泥炭沼泽土为研究对象 ,逐月分层采集土样 ,测定P、K含量 ,同时进行相关环境因子的测量。借助SPSS软件和灰色关联分析技术 ,探讨泥炭沼泽土P、K养分含量特征及影响因子的影响程度。结果表明 :泥炭沼泽土P、K含量在剖面垂直方向具有明显的分层现象 ,P、K含量与土层的二次相关性均较好 ,相关系数除潜育层外均在 0 .94以上。泥炭沼泽土各土层速效P和速效K含量在植物生长季节内均呈明显的动态变化 ,一元三次非线性回归模拟均得到理想的模拟效果。同一环境因子对同一土层全P、全K、速效P或速效K的影响程度各异 ;同一环境因子对不同土层P、K的影响系数也不同 ;因此 ,不同环境因子对同一土层某一对象的影响系数更不相同。

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.