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Acta Prataculturae Sinica ›› 2015, Vol. 24 ›› Issue (6): 35-42.DOI: 10.11686/cyxb2014473

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The compensatory growth of plant community, synusia and species under different clipping intensity

WANG Li-Hua1, 2, LIU Wei3, WANG Jin-Niu2, GAN You-Min1, *, WU Yan2, *   

  1. 1.College of Animal Science and Technology, Sichuan Agriculture University, Chengdu 611100, China;
    2.Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China;
    3.College of Forestry, Sichuan Agriculture University, Chengdu 611100, China
  • Received:2014-11-15 Online:2015-06-20 Published:2015-06-20

Abstract: The species of different layers in community have various responses to clipping, which crucially affect the compensation ability of the whole community and its productivity. Thus, this study aims to investigate the compensatory effects of grassland community and different layer of species, and three clipping intensities were conducted in Qishan pasture of Chongqing in the growing season. The study found that, 1)community aboveground biomass recovered more quickly at moderate clipping rate than that at high clipping rate, while the aboveground relative growth rate (RGR) reached the highest at the high clipping rate; 2)at the end of growing season, RGR of the top layer reached maximum at moderate clipping intensity, and the middle layer of RGR was reached maximum at high clipping intensity; 3)the moderate clipping intensity appropriated the over-compensatory growth for the tall plants, however, the high clipping intensity was suitable for the middle species; 4)at the moderate clipping rate, the total community biomass was positively correlated with biomass of top layer species, however, there were positive correlations between biomass of top and middle layer species and community biomass at high clipping rate, but no significant relationship was found between community biomass and the lower layer species biomass at the moderate and high clipping rate; 5)for the dominant species, Miscanthus floridulus, Dactylis glomerata and Trifolium repens presented the similar biomass change patterns with those at synusia level. The results demonstrate that the plants at different synusia level shave species-specific responses to clipping removal with different intensity. Moderate clipping intensity was appropriate for the over-compensatory growth of the tall pants, while the high clipping intensity was suitable for middle species. In conclusion, clipping intensity should be adopted according to the fragments of layers’ characteristics and that can be advantageous for grassland productive potential.