Acta Agrestia Sinica ›› 2017, Vol. 25 ›› Issue (4): 749-755.DOI: 10.11733/j.issn.1007-0435.2017.04.009

Previous Articles     Next Articles

Soil Saline Characteristics of Different Plants Inhabitant on Horqin Grassland

LV Xin-pei, ZHANG Ji-ping, LI Yong-sheng, HE Ao-lei, WANG Suo-min, ZHANG Jin-lin   

  1. State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu Province 730000, China
  • Received:2016-06-02 Revised:2017-06-21 Online:2017-08-15 Published:2017-11-01

内蒙古科尔沁草原不同植物生境土壤盐分特征研究

吕昕培, 张吉平, 李永生, 何傲蕾, 王锁民, 张金林   

  1. 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, 甘肃 兰州 730000
  • 通讯作者: 张金林,E-mail:jlzhang@lzu.edu.cn
  • 作者简介:吕昕培(1992-),男,甘肃张掖人,硕士研究生,E-mail:lvxp15@lzu.edu.cn;
  • 基金资助:

    国家自然科学基金项目(31222053,31172256)资助

Abstract:

Soil salinization threatens agricultural production seriously. So, we are looking forward to providing some improvement methods for salinized land. This study analyzed salinized grassland soil characteristics. In order to explore the long-term adaption of different halophytes communities on Horqin Grassland, we sampled four natural salinized grassland (Suaeda salsa, dwarf Suaeda salsa, Puccinellia tenuiflora and Iris lactea) soils along with alfalfa vegetation soil (improved by Suaeda salsa) in Horqin, Inner Mongolia. We measured soil pH, EC, Na+, K+ and Ca2+ content. We calculated soil Na+/K+ ratio and analyzed correlation between ion content and soil EC value by linear regression analysis. The results indicated that S. salsa soil had the highest pH value and soil salinity content, and it had strong adaptability to salinity. P. tenuiflora could live with high Na+/K+ ratio in soil, and possessed significant selectivity for K+ over Na+ (P < 0.05). Utilizing linear regression analysis, we found that Na+ content had the highest correlation with soil EC value, and Na+ was the major factor for causing soil salinization in this region. After planting S. salsa, soil pH and EC value, Na+ and Ca+ content decreased significantly. Therefore, S. salsa was very effective plant on the improvement of saline alkali soil.

Key words: Salinized grassland, Soil salt content, Ion content, Na+/K+ ratio, Saline soil improvement

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(P < 0.05);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。

关键词: 盐碱化草地, 土壤含盐量, 离子含量, Na+/K+, 盐碱化改良

CLC Number: