华北黄泛平原潮土磷素含量与土壤粒级的关系研究

华北地区黄泛平原上的主要土壤类型是潮土 ,其成土母质是近代河流冲积物 ,它对土壤质地的影响很大。潮土土壤质地的水平和垂直分异是造成土壤磷素含量差异的主要因素。根据全国土壤普查测定的潮土土壤不同粒级的百分含量以及土壤磷素含量的数据 ,利用数理统计的方法首先进行土壤机械组成与土壤磷素含量的相关分析 ,结果发现 ,与土壤全磷含量关系最密切的土壤颗粒是砂粒和粉粒 ,与土壤速效磷含量最密切的是粘粒。然后用逐步回归分析的方法建立了潮土全磷和速效磷含量与土壤粒级之间关系的数学模型。用这些模型能较准确地推算土壤全磷的含量 ,在相对误差不大于 1 0 %的保证下 ,准确率可达 90 %。而对速效磷的推算 ,效果相对差些

Research on the Relationship between Particles and Levels of Phosphorus in the Alluvial Soils on the Yellow River Flood Plain in North China

The main type of soils on the Yellow River Flood Plain in North China is called Chaotu(alluvial soil) by Chinese. The levels of phosphorus of this alluvial soil are mainly affected by the texture, the contents of assorted particles. Based on the data of this soil published by provincial government,the relations of phosphorus with particles were analyzed by using methods of correlation. It is found out that the particles of sand and silt are the first two factors to contribute the content of total phosphorus, clay and less than 0.01mm particles to contribute the content to available phosphorus. Two mathematic models on the relationship between phosphorus (total phosphorus and available phosphorus) and particles of the soil are built by the method of stepwise regression. The result of predicting content of total phosphorus is better than that of available phosphorus.