Journal of East China Normal University(Natural Sc ›› 2015, Vol. 2015 ›› Issue (2): 133-.doi: 10.3969/j.issn.1000-5641.2015.02.016

• Article • Previous Articles    

Variation of leaf nitrogen and phosphorus of annual weeds along urban rural gradient and their relationships with soil fertility

DUAN Xiu-wen1,CAI Bei-ming1,CHEN Xiao-shuang1,CUI Yi-chong1,DA Liang-jun1,3   

  1. 1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai200241, China;
    2. Shanghai Key Laboratory for Ecology of Urbanization Process and
    Ecorestoration, East China Normal University, Shanghai200241, China;
    3. Tiantong National Station of Forest Ecosystem, Chinese National Ecosystem Observation and Research Station, East China Normal University, Shanghai200241, China
  • Received:2014-04-11 Online:2015-03-25 Published:2015-05-28

Abstract: Leaf mass based nitrogen (Nmass) and phosphorus (Pmass) concentrate were measured for three annual weeds,Setaria viridis, Echinochloa crusgalli and Eclipta prostrate which are widely distributed from urban areas to rural areas in Shanghai. The differences of Nmass and Pmassamong three urban gradients were compared for each species and were related with the total nitrogen (SoilN) and phosphourous (SoilP) concentrate in soil. The results indicated that: ① N mass of all annual weeds was significantly increased from urban areas to rural areas, but Pmass  did not show significant variation. ② For each species, S. viridis and E.prostrate showed a significant increasing tendency of Nmass from urban areas to rural areas, while only S. viridis showed a significant increasing tendency of Pmass. ③ Both of SoilN and SoilP showed negative relationships with Nmass and Pmass. All those results suggested that annual weed could response to urbanization by changing nitrogen and phosphorous concentrate in leaves which might be partly caused by the variation of soil fertility, but species have different strategies in changing Nmassand Pmass to adapt the urban habitats.

Key words: Shanghai, urbanization, annual weeds, soil total nitrogen and phosphorus

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