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依据北京土壤养分分等定级标准,对2006年北京市密云、平谷和顺义3个区县测土配方施肥测定土壤数据进行了肥力分等,初步掌握了3个区县土壤养分状况,即平谷和顺义的土壤养分水平高于密云,平谷略高于顺义;3区县的土壤有机质水平基本处在中低水平上;土壤全氮养分均处于中等水平;土壤有效磷含量处于极低水平。另外,土壤种植类型和不同区域的种植结构和种植管理的规模化产业化程度对土壤养分的变异性有很大的影响,土壤磷钾养分的变异系数明显高于有机质和全氮指标。
According to the standard of Beijing soil nutrient classification and grading, soil fertility data were determined by soil testing and formula fertilization in three districts and counties in Miyun, Pinggu and Shunyi of Beijing in 2006, and preliminary grasped the soil nutrient status in three districts and counties, that is, Pinggu The soil nutrient level of Heshunyi was higher than that of Miyun, and Pinggu was slightly higher than that of Shunyi. The soil organic matter level of the three counties was basically at the low and middle levels. The total nitrogen of soil was at medium level and the soil available phosphorus was at a very low level. In addition, the scale of industrialization of planting types and planting structure and planting management in different regions greatly affected the variability of soil nutrients. The coefficient of variation of phosphorus and potassium in soil was significantly higher than that of organic matter and total nitrogen.