内蒙古科尔沁草原不同植物生境土壤盐分特征研究

发布时间：2018-10-12 20:57

【摘要】：通过分析测定科尔沁草原不同类型盐碱化草地土壤的性质,探索了不同盐生植物群落长期适应生长的盐渍土壤特性,以期为生物改良盐碱地提供一定的理论依据。本研究对内蒙古科尔沁草原4种自然盐碱化草地—碱蓬(Suaeda salsa)、矮化碱蓬(dwarf Suaeda salsa)、小花碱茅(Puccinellia tenuiflora)、马莲(Iris lacteal)以及经碱蓬改良后的紫花苜蓿(Medicago sativa)地生境土壤进行取样,测定了其生境土壤pH、电导率、Na~+含量、K~+含量和Ca2~+含量,计算了土壤Na~+/K~+比值,利用线性回归分析法分析了3种离子含量与土壤电导率的相关性。结果表明:碱蓬生境土壤中盐分含量最高,因此碱蓬对盐渍化土壤适应能力最强;小花碱茅能够在Na~+/K~+比值高的土壤中生存,对土壤中K~+,Na~+吸收具有显著的选择性(P0.05);通过线性回归分析发现,Na~+含量与各植物生境土壤电导率的相关性最密切,因此Na~+是造成该地区土壤盐碱化的主要因素;经碱蓬改良后的土壤,其pH,电导率,Na~+和Ca2含量均有显著的降低,证明碱蓬对盐碱地的改良十分有效。
[Abstract]:By analyzing and determining the soil properties of different types of salinized grassland in Horqin grassland, the characteristics of salinized soil adapted to the growth of different halophyte communities for a long time were explored in order to provide certain theoretical basis for biological improvement of saline-alkali land. The soil samples of four natural salinized grasslands, Suaeda salsa (Suaeda salsa), dwarfing Suaeda salsa, (dwarf Suaeda salsa), floret, (Puccinellia tenuiflora), Marilyn (Iris lacteal), and improved alfalfa (Medicago sativa) habitat, were studied in Horqin steppe, Inner Mongolia. The soil pH, conductivity, Na~ content, K ~ content and Ca2~ content were measured, and the ratio of soil Na~ / K ~ was calculated. The correlation between three kinds of ion contents and soil conductivity was analyzed by linear regression analysis. The results showed that the salt content of Suaeda salsa was the highest, so Suaeda salsa had the strongest adaptability to salinized soil, and Festuca flotata could survive in the soil with high Na~ / K ~ ratio. By linear regression analysis, it was found that the content of Na~ was most closely related to the soil conductivity of plant habitats, so Na~ was the main factor of soil salinization in this area. The pH, conductivity, Na~ and Ca2 content of the soil improved by Suaeda salsa were significantly decreased, which proved that Suaeda salsa was very effective in the improvement of saline-alkali soil.
【作者单位】：草地农业生态系统国家重点实验室兰州大学草地农业科技学院;
【基金】：国家自然科学基金项目(31222053,31172256)资助
【分类号】：S812.2

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