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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (4): 12-21.DOI: 10.11686/cyxb2021007

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Numerical classification and ordination of the desert steppe plant community in Etuokeqianqi, Inner Mongolia

Ling JIN1(), Ying LU1, Hong-bin MA1,2,3, Ying-zhong XIE1,2,3, Yan SHEN1,2,3()   

  1. 1.Agriculture College,Ningxia University,Yinchuan 750021,China
    2.Ningxia Grassland and Animal Husbandry Engineering Technology Research Center,Yinchuan 750021,China
    3.Key Laboratory of Restoration and Rehabilitation of Degraded Ecosystem in Northwestern China,Yinchuan 750021,China
  • Received:2021-01-05 Revised:2021-04-06 Online:2022-04-20 Published:2022-01-25
  • Contact: Yan SHEN

Abstract:

It is very important in grassland scientific management and biodiversity protection to understand the grassland community types, and their distribution and relationship with edaphic factors. In this research, 100 sample sites on the desert steppe of Etuokeqianqi in Inner Mongolia were investigated. We used two-way indicator species analysis (TWINSPAN) to classify the plant communities, and canonical correspondence analysis (CCA) to analyze the relationship between plant communities and soil factors. It was found that: 1) The flora types of desert steppe in the study area can be divided into Artemisia ordosica+Stipa brevifloraS. breviflora+Achnatherum splendensAgropyron cristatum+A. splendensA. ordosica+Sophora alpecuroidesCaragana liouana+Lespedeza potaniniiS. breviflora+Oxytropis aciphyllaS. alopecuroides+S. brevifloraStipa grandis+Nitraria tangutorum. 2) CCA ordination results showed that the correlation between soil physical and chemical factors and the plant species ordination axis was driven by alkali hydrolyzable nitrogen, available potassium, total phosphorus, soil bulk density, total nitrogen, available phosphorus, organic matter and total carbon. Alkali hydrolyzable nitrogen and available potassium had the greatest impact on the distribution of plant communities at the study site. 3) The combination of TWINSPAN classification and CCA ordination elucidates the relationship between community distribution patterns and environmental factors, and thus provides reference information for ecological management and decisions fostering sustainable utilization of desert steppe in Etuokeqianqi, Inner Mongolia.

Key words: desert steppe, community classification, CCA ordination, soil factors