Abstract:
Objective As the major soda-saline soil distribution in the world, the sustainable development of Songnen Plain was seriously inhibited by Salinization. To reveal the mechanisms of vegetation establishment in saline-alkali habitats, the relationship between vegetation, soil and climate was explored.
Method First, the soils in the rhizosphere of Suaeda glauca, Puccinellia tenuiflora and Leymus chinensis during dry and wet seasons were collected from saline-alkali grassland in Zhaodong, Heilongjiang Province. Subsequently, the soil physicochemical properties and enzyme activities were determined, and the effects of halophyte types-seasons on soil factors were analyzed.
Result The contents of organic matter, total nitrogen, total phosphorus, Ca
2 + , K
+ and activities of sucrase and urease increased in the wet season at three stages. However, the value of pH, electrical conductivity,
\textCO_\text3^2- 
, Na
+ ,
\textHCO_\text3^- 
contents and catalase activities decreased in the wet season. Besides, the principal component analysis indicated that soil organic matter, total nitrogen, pH value, electrical conductivity,
\textCO_\text3^2- and Na
+ contributed significantly to soil properties variations.
Conclusion The soil factors were significantly affected by the seasonal precipitation and vegetation succession in saline-alkali grassland in Songnen Plain, wet seasons and community succession promoted the restoration of saline-alkali ecology.
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