Abstract: Salt variation law in greenhouse soil was studied in Chifeng City,Inner Mongolia Autonomous Region.The result indicated:Salt content in greenhouse was higher than open field (CK)in main vegetable area of Chifeng city.Salt content was significant difference between 0-5 cm and 5-20 cm soil in Songshang Area,Hongshan Area and Ningcheng County but Yuanbaoshan Area.The highest salt content in 0-5 cm and 5-20 cm soil was 4.12 g/kg and 1.8 g/kg in greenhouse of Ningcheng County after planting 20 years.Average salt content in Ningcheng County reached the highest value,3.14 g/kg in 0-5 cm soil and 1.45 g/kg in 5-20 cm soil,and increased more 292.5% and 215.2% than CK respectively.Sequence of mean content was Ningcheng County Yuanbaoshan AreaSongshan AreaHongshan Area.It was after 5 years that mean salt was the most content.It was related to development of greenhouse agriculture and planting structure in Chifeng City.Ion causing secondary salinization of greenhouse soil was different in 4 areas.The highest SO₄^2-,NO3- and Ca²⁺ of greenhouse soil in Ningcheng County reached 1 008 mg/kg,936 mg/kg,and 448 mg/kg.Salt content in the county showed highly significant positive correlation with content of SO₄^2-,NO3-.Their correlation coefficient was 0.975** and 0.974** respectively.Salt content displayed significant positive correlation with Ca²⁺,Mg²⁺,Na+ and their correlation coefficient was 0.875*,0.873* and 0.865*;Salt content in Yuanbaoshan Area was highly significant or significant correlation with Ca²⁺ and SO₄^2-.Their correlation coefficient was 0.991** and 0.950** respectively.

Key words: Greenhouse soil, Secondary, Correlation analyzed

CLC Number: 

• S151.9??