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土壤次生盐渍化问题日益严重,对农业发展构成严重威胁。以大棚蔬菜土壤为试材,采用田间取样分析方法,研究了次生盐渍化土壤养分、可溶性盐含量、组成及其垂直分布特点。结果表明:次生盐渍化土壤养分主要集中在土壤表层0~10cm处,随着土层的加深,有机质呈先下降后增加的趋势,速效氮、速效磷、速效钾含量呈递减趋势;可溶性盐含量随土壤深度的增加呈下降趋势,表层(0~10cm)含量最高,10cm以下各土层可溶性盐分含量显著减少;表层土壤(0~10cm)可溶性盐分离子主要为Ca~(2+)和NO_3~-,分别占阳离子总量的59.71%和阴离子总量65.95%。
The problem of secondary salinization of soil is becoming more and more serious, posing a serious threat to the development of agriculture. Taking greenhouse vegetable soil as test material, field sampling analysis method was used to study the secondary salinization soil nutrient, soluble salt content, composition and its vertical distribution characteristics. The results showed that: the secondary salinization of soil nutrients concentrated in the soil surface 0 ~ 10cm, with the deepening of the soil, organic matter decreased first and then increased, available nitrogen, available phosphorus, available potassium decreased; soluble The salt content decreased with the increase of soil depth, and the content of soluble salt in the surface layer (0 ~ 10cm) was the highest. The content of soluble salt in the soil below 10cm decreased significantly. The soluble salt ions in surface soil (0 ~ 10cm) NO_3 ~ -, accounting for 59.71% of the total amount of cations and 65.95% of the total amount of anions, respectively.