扬州市土壤有机质和速效磷钾的分布研究

研究表明，我市土壤有机质和速效P含量总体上处于中等偏低水平，速效K含量处于中等水平；90％以上的土壤有机质含量在10～40g/kg之间，速效P含量在2～29mg/kg之间，速效K含量在25～125mg/kg之间；在集中分布区，土壤有机质和速效P近似于呈偏正态分布，速效K近似于呈正态分布：各养分的变异程度以速效P最大，速效K最小。各县(市、区)中，以宝应、高邮两地的土壤肥力较高。

DISTRIBUTION OF SOIL ORGANIC MATTER, AVAILABLE PHOSPHORUS AND AVAILABLE POTASSIUM IN SOILS OF YANGZHOU

Results of the research show that the soil organic matter content and soil available phosphorus content, both are generally moderate towards low, and the soil available potassium content is generally moderate in Yangzhou area, Jiangsu province. Over 90 % of the soil has soil organic matter ranging between 10 to 40 g/kg in content, soil available phosphorus between 2 to 29 mg/kg, and soil available potassium between 25 to 125 mg/kg. Within the range, soil organic matter and soil available phosphorus appear in deviated normal distribution, and soil available potassium in normal distribution. Among these soil nutrients, variation coefficient of soil available phosphorus is the highest, and that of soil available potassium is the lowest. Among different counties, soil fertility is relatively higher in Baoying county and Gaoyu county.