摘要
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 nutrient leanness of coastal saline soil, weight values of soil organic matter, total nitrogen, available nitrogen, available phosphorus, available potassium were determined by using correlation and the principle component analysis method. Then the soil integrated fertility index was obtained, which could be used to evaluate the fertilizing effect of different fertilizers combined with gypsum application. The results showed that： （1）The IFI, determined respectively by correlation and the principle component analysis methods reached a very significant level（r0.01=0.897＊＊, n=13）. The functional relationship is y=l.O154x-O.0907; （2） Compared with the IFI, organic-inorganic compound fertilizer（12-8） was the best in improving the soil nutrients in coastal saline soil. Next was organic-inorganic compound fertilizer （10-5-5）, and the third was bio-organic fertilizer. The inorganic compound fertilizer was the last; （3）When gypsum was utilized to improve the coastal saline soil, its amount should be noticed. The improve effect was better when the amount of gypusm was 300 kg hm-2 combined with organic-inorganic compound fertilizer （12-8）. The research results could serve as a theoretical reference to the soil fertility improvement and precision fertilization of coastal saline soil in research region.
出处
《土壤通报》
CAS
CSCD
北大核心
2013年第1期149-154,共6页
Chinese Journal of Soil Science
基金
公益性行业(农业)科研专项经费项目(200903001)
"江苏高校优势学科建设工程资助项目"资助
关键词
滨海盐渍土
土壤养分
肥料
土壤综合肥力指标值
Coastal saline soil
Soil nutrient
Fertilizer
Soil integrated fertility index
