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

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。

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

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.