长期定位施肥对保护地土壤全盐量影响的研究

目的]为了了解长期定位施肥对保护地土壤盐分影响。方法]对试验基地土壤盐分进行连续三年的测定和分析。结果]长期定位施肥保护地土壤中的全盐量是逐年增加的。2000年比1999年增长83.33%,2001年比2000年增长17.17%,平均年增长率为45%。2001年施有机肥的处理中盐分积累最少;而不施有机肥的处理盐分积累最多。在有机肥用量相同的条件下,氮肥用量与盐分的相关性较小(r=0.23);无机肥处理中,氮肥用量与盐分的相关性较大(r=0.94)。结论]长期定位施肥保护地土壤中的全盐量是逐年增加的,不施有机肥的处理盐分积累较施用有机肥的处理高。

Effect of Long-term Located Fertilization on Total Salt Content in Soil of Protected Field

Objective] The purpose was to know the effect of longterm located fertilization on the soil salinity of protected field.Method] The soil salinity of experimental field was determined and analyzed for continuous three years.Result] The total salt content in the soil of protected field with long-term located fertilization was increased year by year.Compared with 1999,it was increased by 83.33% in 2000;compared with 2000,it was increased by 17.17% in 2001,and the average annual increase rate was 45%.The salinity accumulation was least in the treatment with organic fertilizer and most in the treatment without organic fertilizer.Under the condition of equal organic fertilizer dosage,the relativity between N dosage and salinity was less(r=0.23).In the inorganic fertilizer treatment,the relativity between N dosage and salinity was greater(r=0.94).Conclusion] The total salt content in soil of protected field with long-term located fertilization was increased year by year.The salinity accumulation in the treatment without organic fertilizer was higher than that of treatment with organic fertilizer.