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cje ›› 2005, Vol. ›› Issue (6): 607-612.

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Effects of severied rhizome on clonal growth of Leymus secalinus and Carex praeclara of alpine desertification grassland in Northwestern Sichuan

HE Wenxing, YANG Zhirong, CAO Yi, CHEN Fang   

  1. Life College of Sichuan University, Chengdu 610064, China
  • Received:2003-12-24 Revised:2004-02-25 Online:2005-06-10

Abstract: Effects of severed rhizome on clonal growth of Leymus secalinus and Carex praeclara was investigated in Nuoergai plateau of Sichuan.The results showed that the increments of total length of shoots,length of main rhizome and total length of rhizomes were reduced by the severed rhizomes in the developing parts (observed plant unit) of Leymus secalinus and Carex praeclara,while no effect was observed in the number of rhizomes,number of main rhizome rhizome and total number of rhizome nodes.Severing rhizome reduced the number of Leymus secalinus shoots,but had no effect on Carex praeclara,and the interrelation of shoots and rhizomes was reversed.It suggested that the length growth of shoots and rhizomes in the developing parts were promoted by the clonal integration,while no effect was observed on the emergence of rhizomes and differentiation of rhizomes nodes.The competition between the reproductive growth and vegetative growth of Leymus secalinus and Carex praeclara increased if the plants were severed and the competition between the aboveground and underground increased as well.The effect of severing off treatment on Leymus secalinus was heavier than that on Carex praeclara when lack of clonal integration with genet.

Key words: Forest catchment, Unsaturated soil water flow, Saturated soil water flow, Soil water hydraulic properties

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