| Abstract: Vegetable industry in China has existed salinization, soil which has become the sustainable use of facilities, one of the important obstacles. Some scholars have found that the soil microbial community structure changes will affect the soil physical and chemical properties, a comprehensive change in soil quality. They can to some extent the dynamic response of soil organic matter mineralization and soil nutrient conditions. Therefore, many scholars began to actively research in recent years, by improving the soil microbial community to improve soil health, improve the salinization and even overcome the phenomenon. In this experiment, the facilities even for the serious obstacle for the study of cucumber, salt-tolerant varieties selected Jinlv No.5, and salt-sensitive Jinyou No.1 for the test materials to NaCl for the salt stress, concentration, respectively, 0mg ? kg- 1, 585mg ? kg-1, cinnamic acid concentration of 0mg ? kg-1 25mg ? kg-1 50mg ? kg-1 200mg ? kg-1, using PCR-DGGE molecular biology of salt stress on cucumber different concentrations of benzene Acrylic on soil microbial community structure diversity, and measured using conventional methods of cucumber plant height, stem diameter, dry weight, fresh weight, leaf area, rhizosphere microorganisms, soil nutrient content, soil enzyme activities , microbial biomass carbon and nitrogen, and to investigate the yield of cucumber plant. To reduce the salt stress, a comprehensive understanding of the obstacles even for salt stress, cinnamic acid, and the relationship between the soil and lay a theoretical foundation. The experiment the following conclusions:1. Salt stress, the cucumber plant height, stem diameter, fresh weight, dry weight, leaf area was significantly inhibited, low concentrations of cinnamic acid on plant height, stem diameter growth promoting effect of high concentrations of cinnamic acid on cucumber height, fresh weight, dry weight, leaf area was inhibited.2. Salt stress reduced the soil bacteria, fungi, actinomycetes content, promoted the Fusarium content. Cinnamic acid in a given period showed "high concentrations of low concentration for inhibiting" effect; salt stress, cinnamic acid treatment 7d, 14d high concentration of cinnamic acid on soil fungi have a certain role in promoting, but Jinyou 1 promote the role of No. 14d to a significant (p <0.05).3. Salt stress decreased the soil urease, invertase, catalase activity, increased peroxidase activity of the soil. Low concentrations of cinnamic acid on the activity of these three kinds of soil can promote the high concentration of cinnamic acid on inhibition of soil enzyme activity, but the opposite effect of soil peroxidase activity. Two cucumber varieties close to the soil urease activity, salt Jinlv No. 5 soil-converting enzyme, catalase activity than salt-sensitive Jinyou No. 1 variety, soil peroxidase activity was lower than Jinyou No. 1 species Jinlv No. 5 varieties show some tolerance characteristics.4. To different degrees of salt stress and decreased available nitrogen, phosphorus, organic matter content, improve soil available potassium. Low concentrations of cinnamic acid on soil available nitrogen, phosphorus can promote. High concentrations of cinnamic acid on soil available nitrogen, phosphorus inhibited. Cinnamic acid to the soil organic matter content had no significant effect. Salt stress increased the soil pH and EC values, high concentrations of cinnamic acid to salt-sensitive Jinyou No. 1 soil EC value increased.In conclusion, salt stress, soil available to support victims, changing the soil micro-ecological environment, resulting in the number of soil microorganisms and richness reduced, cucumber growth was inhibited physiological decline. Jinlv No. 5 pairs of high-salt stress adaptability can be enhanced by improving the soil micro-environment for its salt tolerance. |
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