不同土层土壤粒径及有机质含量空间变异的相关性研究

Correlation of Spatial Variability of Soil Partical Size and Organic Matter at Different Soil Layers

为了探讨土壤粒径和有机质空间分布特点及其相互关系伴随土层的变化规律,本研究以内蒙古河套灌区沙壕渠分干渠灌域为研究目标,以灌溉区域内间隔1 km等间距77个取样点共308个样本为基础进行综合探讨,结果表明:土壤粒径及有机质不同土层及其相互之间均存在极显著的相关性(P<0.01),且相关性随着土层间隔的增大而减小,同时有机质含量与黏粒含量的相关性最高,相关系数为0.583。土壤粒径及有机质在剖面上的层次组合及分布主要是成土过程和母质沉积过程所致,不同土层的空间变异性相关程度较高。而同一土层黏粒含量与有机质的空间变异性呈现出较强的正相关性;粉粒及砂粒含量体现出较强的负相关性。

To discuss the spatial distribution characteristics of the soil particle size and the organic matter and their relationship, the Shahao- qu irrigation unit in Hetao Irrigation District was selected as the research target in this paper. The irrigation unit was divided at each lkm dis- tance, thus there were 77 sampling points with 308 samples. Based on these data, the spatial variability and the relation were discussed and analyzed. The results showed that there were significant correlation （P〈0.01） between the soil particle size and organic matter at different soil layers. And the correlation decreases with the increase of soil layer interval. At the same time, there was a highest correlation of the organic matter content and clay content, with the correlation coefficient of 0.583. The level combination and the distribution of soil particle size and organic matter in the profile were mainly caused by soil formation and parent material deposition process. There was a higher relation between the spatial variation of different soil layers. At the same soil layer, the spatial variations of soil clay content and organic matter presented a strong positive correlation, while the relation between silt and sand content showed a strong negative correlation.