Effects of Chloride Ion Enrichment in Soil onthe Growth and Development of Crops in the Tanglangchuan River Basin

In order to study the effects of chloride ions on the growth and development of the surrounding crops in the Tanglangchuan River basin, 20 sampling sites were set up in the basin. Soil and plant samples were taken in April and August, respectively, to determine the content of chloride ions. Germination test and pot experiment were used to study the effects of different chloride ion concentration on the growth of maize and broad bean, the main crops in the Tanglangchuan River basin. Seed germination rate, biomass, root activity, leaf membrane damage,malondialdehyde content, Chlorophyll a content and hlorophyll B from spinach enrichment ability of maize and broad bean were measured. The results showed that the average content of chloride ions in soil in April and August were 53. 80 mg/kg and 36. 62 mg/kg, respectively, which were higher than the background value of common soil,and the concentration of chloride ions in soil near the factory was significantly higher than that in other sampling sites. The physiological indexes of corn and broad bean were normal when chloride ion concentration was 100～400 mg/kg. When the chloride ion concentration was 200 mg/kg, the germination rate of maize seed was better, and the best concentration of broad bean seed was 800 mg/kg. The results showed that broad bean indicated better chloride ion tolerance than corn. Combined with the analysis of plant and soil samples, the soil chloride ions in the Tanglangchuan River basin were enriched, but not to the extent of affecting the production of main crops.