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针对滨海盐渍土养分贫瘠问题,选择了土壤有机质、全氮、碱解氮、速效磷、速效钾等5个养分指标,采用相关分析法和主成分分析法确定权重系数,应用综合指数法得出土壤综合肥力指标IFI值,通过比较IFI值,评价了不同肥料与石膏对滨海盐渍土养分的培肥效果。结果表明:(1)相关分析法和主成分分析法得出的IFI值相关性达到极显著水平(r0.01=0.897**,n=13),其函数关系为y=1.0154x-0.0907;(2)通过IFI值比较,以有机无机复混肥(12-8)对试验区滨海盐渍土养分培肥效果最好,其次是有机无机复混肥(10-5-5)、生物有机肥和无机复混肥(15-15-15);(3)在利用石膏对试验区滨海盐渍土进行改良时要注意石膏用量,石膏用量在300 kg hm-2时与有机无机复混肥(12-8)配施对提高滨海盐渍土肥力效果较好。研究结果可为研究区滨海盐渍土培肥和精确施肥提供参考依据。
According to the problem of nutrient-poor barren saline soil, five nutrient indexes such as soil organic matter, total nitrogen, available nitrogen, available phosphorus and available potassium were selected. Correlation analysis and principal component analysis were used to determine the weight coefficient. According to the IFI value of comprehensive soil fertility index, the fertilization effect of different fertilizers and gypsum on nutrient content in coastal saline soil was evaluated. The results showed that: (1) The correlation between IFI and correlation analysis was significant (r0.01 = 0.897 **, n = 13), the correlation was y = 1.0154x-0.0907; (2) Compared with IFI value, organic-inorganic compound fertilizer (12-8) had the best effect on fertilization of coastal salinized soil in test area, followed by organic-inorganic compound fertilizer (10-5-5), bio-organic Fertilizer and inorganic compound fertilizer (15-15-15); (3) Pay attention to the amount of gypsum when using gypsum to improve the coastal saline soil in the test area. When the amount of gypsum is 300 kg hm-2, it should be mixed with organic-inorganic compound fertilizer (12-8) to improve the coastal saline soil fertility is better. The results can provide reference for fertilization and precise fertilization of coastal saline soil in the study area.