云南甘蔗主产区土壤有机质和速效养分分布研究

The Distribution of Soil Organic Matter and Available Nutrient of the Sugar Balt in Yunnan

对2005年10月至2008年12月在云南甘蔗主产区的1450份土壤养分的分析研究,结果表明:云南甘蔗主产区土壤有机质、碱解氮、速效磷处在中等偏低水平,速效钾处在中等偏高水平;90%以上的有机质含量在4～40 g kg-1之间,碱解氮含量在15～160 mg kg-1,速效磷含量在0.5～29 mg kg-1,速效钾含量在30～210 mg kg-1。在集中分布区,土壤有机质、碱解氮呈近似正态分布,速效钾、速效磷呈近似偏正态分布。土壤有效养分的变异程度P>K>N。

Total 1450 soil samples colleceted from the sugarcane planted areas in Yunnan during October 2005 to December 2008 were tested.The results showed that soil organic matter,available N and P were in medium level or slightly lower,available K was in medium level or slightly higher.More than 90%of total soil samples,soil organic matter contents were in 4-40 g kg^-1,available N contents in 15-160 mg kg^-1,available P contents in 0.5-29 mg kg^-1,available K contents in 30-210 mg kg^-1.In the concentrated distribution of the soil nutrient contents,soil organic matter,available N had showed approximate normal distribution,available P and K had displayed approximate partial distribution.The order of soil available nutrient coefficients of variation was PKN,respectively.