Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (2): 197-204.doi: 10.19741/j.issn.1673-4831.2018.0151

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Characteristics and Nitrogen-Phosphorus Stoichiometry of Rock Herb Communities in Huajiang Gorge

YAO Kai, AO Jia-lin, XU Hui   

  1. School of Life Sciences, Guizhou Normal University, Guiyang 550025, China
  • Received:2018-03-28 Online:2019-02-25 Published:2019-03-25

Abstract:

Huajiang Gorge is a typical middle subtropical dry hot valley in Karst area. Taking the rock herb communities in Huajiang Gorge as research objects, the community characteristic, nitrogen-phosphorus stoichiometry and relationships between them were studied. The results show that a total of 16 species of rock herbs and 4 different rock herb communities (Arthraxon hispidus+Phaenonperma globosum, Arthraxon hispidus, Arthraxon hispidus+Imperata cylindrica and Imperata cylindrica+Festuca parvigluma) were found in study area. There was positive correlation between altitude and species similarity coefficient, and negative correlation between altitude and species diversity, substitution rate, soil nitrogen and phosphorus content, hydro-thermal feature. There was a trend of single peak curve in biomasses variation of 4 communities, and plot 2 had the largest biomass. The N and P contents of soils and plant leaves were extremely low in all plots, and the ratios of N/P indicate most of plants growth was limited by N. Strong positive correlation was found between the important value of the plants and the N/P ratios of plant leaves, moderate degree negative correlation was found between the important value of the plants and the P contents of plant leaves, and no significant relation was found between the important value of the plants and N content.

Key words: rock herb community, nitrogen-phosphorus stoichiometry, community characteristics, Huajiang Gorge

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