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采用调查研究与化学分析相结合的方法,对设施农田土壤生态环境恶化的原因进行了初步研究。结果表明,长期过量施肥导致了设施农田土壤环境的恶化。土壤速效P、速效K累积量很高,分别达691.9和623.5 mg.kg-1,100%处于高水平;碱解N含量较低,平均为138 mg.kg-1;土壤盐分含量为0.168%,80%的样本出现盐渍化现象;土壤pH值呈下降趋势,较露地下降了0.3;有机质含量较低,平均值为16.5 g.kg-1;土壤有效Zn、Mn、Cu含量都处于中高水平,大量元素和微量元素的比例失调。
By means of the combination of investigation and chemical analysis, the reasons for the deterioration of soil ecological environment in farmland were studied. The results showed that long-term over-fertilization led to the deterioration of soil environment in farmland. Soil available P and available K accumulate very high, reaching 691.9 and 623.5 mg.kg-1, 100%, respectively. The content of alkaline hydrolyzate N was low, with an average of 138 mg.kg-1. The soil salt content was 0.168% and 80 % Of the samples showed salinization; the soil pH value showed a downward trend, which was 0.3 lower than that of the open field; the content of organic matter was low with an average value of 16.5 g.kg-1; the available Zn, Mn, A large number of elements and trace elements imbalance.