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本文是在曲周试验区的长期定位试验和大田调查的基础上 ，研究了盐渍化土壤在改良、利用及培肥过程中，构成土壤肥力的主要因素的演变规律．研 究结果表明：土壤有机质含量从治理初期的小于５ｇ／ｋｇ提高到１５ ｇ／ｋｇ左右；土壤碱解氮从开 始的富氮假象，逐步出现土壤碱解氮含量迅速下降的现象，再缓慢上升到７０～８０ｍｇ／ｋｇ，有 的甚至超过了１３０ ｍｇ／ｋｇ；土壤有效磷含量从２～３ ｍｇ／ｋｇ或者只有０．５～１ ｍｇ／ｋｇ左右，有的 地块近于零提高到１５～２０ ｍｇ／ｋｇ，有的已接近６０ ｍｇ／ｋｇ；土壤速效钾含量则由治理初期的２０ ０ ｍｇ／ｋｇ，下降到３０ ｍｇ／ｋｇ左右；土壤微生物量明显增加，理化性状不断改善，熟化程度逐 步提高；土壤肥力的变化表现出了阶段性特征．提出了盐渍化土壤的合理施肥技术．
Based on long-term experiment and field investigation in Quzhou experimental area, this paper studied the evolution of the main factors that make up soil fertility in the process of improvement, utilization and fertilization of salinized soils. The results showed that soil organic matter content increased from less than 5g / kg at the initial stage of treatment to about 15 g / kg. Soil alkali-hydrolyzable nitrogen gradually decreased from the initial nitrogen-enriched illusion, and then slowly rose to 70 ~ 80mg / kg, and some even exceeded 130 mg / kg; Available phosphorus content from 2 ~ 3 mg / kg or only 0.5 ~ 1 mg / kg or so, and some plots near zero increased to 15 ~ 20 mg / kg, some of which were close to 60 mg / kg. Soil available potassium decreased from 20 mg / kg to 30 mg / kg at the initial stage of treatment. Soil microbial biomass was significantly increased and the physicochemical properties were improved. Gradually increased; changes in soil fertility showed a period of characteristics. Proposed a reasonable fertilization technology of salinized soil.