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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (2): 26-34.DOI: 10.11686/cyxb2022064

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Effects of mowing intensity on community characteristics and soil physicochemical properties of Stipa grandis steppe, Inner Mongolia, China

Qi WANG1(), Jia-hua ZHENG1, Meng-li ZHAO1, Jun ZHANG2()   

  1. 1.College of Grassland Resources and Environment,Inner Mongolia Agricultural University,Hohhot 010010,China
    2.College of Science,Inner Mongolia Agricultural University,Hohhot 010010,China
  • Received:2022-02-14 Revised:2022-04-05 Online:2023-02-20 Published:2022-12-01
  • Contact: Jun ZHANG

Abstract:

This study investigated the effects of different mowing intensities on plant community characteristics and soil physicochemical properties of Stipa grandis steppe in order to provide a theoretical and scientific basis for establishing an appropriate mowing system in S. grandis steppe. We conducted a field vegetation survey and sampling in an experimental mowing area at Maodeng Ranch, Xilinhot, Inner Mongolia, China in 2020. The experimental mowing area was established in 2014 with no mowing as control (CK) and three treatments of light (LM), moderate (MM) and heavy mowing (HM). In this study, we investigated the relationship between community characteristics and soil physicochemical properties by calculating species importance values and diversity indices, and measuring above- and below-ground biomass of plant communities and soil physicochemical properties. It was found that: 1) Compared with no mowing, new species were increased under the various mowing intensities, and the number of species was highest under MM. Compared with no mowing, the mowing treatments significantly increased community richness and the Shannon-Wiener index, and light mowing also significantly increased the Simpson and Pielou indexes, indicating that light mowing was most beneficial to maintaining community diversity. Variation in mowing intensity had no significant effect on productivity of S. grandis steppe. 2) Soil total carbon, total nitrogen and pH were the highest under MM, and under this treatment were significantly higher than under no mowing, indicating that moderate mowing had positive effects on soil nutrient status. 3) Nitrate nitrogen was the main soil factor affecting grassland productivity, and soil water content was the main soil factor affecting grassland community diversity. This study provides important reference information for the study of community structure, species diversity and productivity of S. grandis steppe.

Key words: mowing intensity, typical steppe, productivity, diversity