三江平原草甸白浆土P、K养分含量特征及影响因素

The P and K Concentration Characteristics and Their Effect Factors in the Meadow Albic Bleached Soil in the Sanjiang Plain

在三江平原湿地植物生长季节期内 ,选择具有代表性的小叶章湿地发育的草甸白浆土为研究对象 ,逐月分层采集土样 ,测定其P、K含量 .在此基础上借助SPSS软件和灰色关联分析技术 ,探讨了草甸白浆土中P、K含量的分布特征及相关环境因子对P、K含量动态变化的影响 .结果表明 :草甸白浆土中P、K含量在剖面垂直方向具有明显的分层现象 ,P、K分布与土层的相关性均较好 ,相关系数均在 0 94以上 .此外 ,草甸白浆土各土层P、K含量在植物生长季节均呈明显的动态变化 ,用一元三次非线性回归模型可得到较理想的拟合结果 .同一环境因子对草甸白浆土各土层中全P、全K、速效P及速效K的动态分布影响程度不同 ;不同环境因子对同一土层中P、K的动态分布影响程度更不同 .降水量在所有环境因子中影响程度最大 ,且土壤表层受环境因子的影响较底部土层敏感 .

During the growth season of wetland plant in the Sanjiang Plain, the representative meadow albic bleached soil developed in the Deyeuxia angustifolia wetland was chosen as the study objects, soil was sampled by soil layer monthly, their P and K concentration and correlative environmental factors were measured synchronously. Based on these data, with SPSS software and grey relating analyse means, this paper discussed the P and K concentration characteristics and their effect degree in the meadow albic bleached soil. The results were as following: The P and K concentration has obvious layered phenomenon in the soil profile, the correlations between P and K concentration and soil layer are remarkable, all their correlation coefficients are above 0.94. The P and K concentrations of every soil layer have an obvious seasonal dynamics in plant growth season. Their one-factor non-linear regression simulation models are suitable. The same environmental factor's affection degrees on the total P, total K, rapidly available P and rapidly available K of same layer or different layer are not same. Different environmental factor's affection degrees on same object are different also. Rainfall has the biggest affection degree in all environmental factors. The surface soil layer is more sensitive than bottom soil layer in the affection degree of environmental factors.