森林土壤空间变异性及其样本容量的确定

A Research on Spatial Variability of Forest Soil and Determining Number of Sample

在森林中多剖面多土层取土样测定结果表明 ,土壤容重、非毛管孔隙度、渗透性能 (稳渗率 )、有机质、p H值等都具有明显的空间变异性 ,且垂直方向上的变异大于水平方向。由于各因子在垂直方向的变异规律不尽相同 ,所以 ,只有根据误差理论确定出每层所需的样品容量 ,才能保证不同土层间的测定结果具有可比性。开展这一研究对指导合理取样和决定样品容量 。

By means of sampling and analyzing many soil sample's physical and chemical characteristic in different forest soil profiles,the results showed:forest soil bulk density, non-capillary porosity,infiltration capability(K_(10)),soil organic matter content, soil pH value and so on,they have obvious roomage variability.And this roomage variability in vertical is more than that in horizontal. Therefore, we must base on the error theoretics to confirm the soil sample in different soil deepness.And this ensurs the results correct and has relativity.