土壤盐分特征对内陆盐沼盐生植物群落的影响

为研究内陆盐沼植物群落的分布对土壤盐分的响应特征,选取鄂尔多斯盐湖盐沼区作为研究区,筛选了肉质耐盐植物群落,苔草植物群落和禾草植物群落3类典型植物群落,开展了土壤含水量、pH、电导率以及Na_⁺,K_⁺,Mg2_⁺,Ca_{^{2 +}},Cl_^-、SO_4^2-、CO_3^2-和HCO_3^-的测定,分析了区内典型植物群落对土壤水盐因子的响应规律。探讨了3类植物群落之间土壤因子含量的差异性；采用相关性分析和CCA分析,评价了3类植物群落多样性及物种分布随土壤因子的变化规律。结果表明,区内3类植物群落中,土壤盐分含量表现为肉质耐盐植物群落最高,苔草植物群落最低,禾草植物群落居中；植物多样性与土壤中含量最高的Na_⁺和SO_4^2-的相关性最显著；植物分布同时受到土壤盐分、水分和pH的显著影响。研究结果可为鄂尔多斯盐湖区土壤盐渍化改良和植被恢复提供理论支撑。

Effects of Soil Salinity Characteristics on Halophyte Plant Communities in Inland Salt Marshes

To study the response characteristics of the distribution of inland salt marsh plant communities to soil salinity, the Ordos salt lake and salt marsh area was selected as the research area, and three typical plant communities were screened for the succulent salt-tolerant plant community, the Carex plant community and the Gramineous grass plant community. The soil water content, pH, electrical conductivity and the determination of Na⁺, K⁺, Mg²⁺, Ca²⁺, Cl^-, SO4^2-, CO3^2- and HCO3^- were measured the response of typical plant communities in the area to soil water and salt factors was analyzed. The differences in the content of soil factors among the three types of plant communities were discussed; correlation analysis and CCA analysis were used to evaluate the changes in the diversity and species distribution of the three types of plant communities with soil factors. The results showed that among the three types of plant communities in the region, the soil salt content was the highest in the succulent salt-tolerant plant community, the Carex plant community was the lowest, and the Gramineous grass plant community was in the middle; the plant diversity was correlated with the highest content of Na⁺ and SO4^2- in the soil. Plant distribution is also significantly affected by soil salinity, moisture and pH. The research results can provide theoretical support for soil salinization improvement and vegetation restoration in the Ordos salt lake area.