Journal of East China Normal University(Natural Sc ›› 2012, Vol. 2012 ›› Issue (4): 157-163.

• Article • Previous Articles     Next Articles

Research on the effects of weed nitrogen and phosphorus enrichment in natural approximating ecological agro-ditches of Dianchi Lake basin

HE Ming-zhu 1, XIA Ti-yuan 1,2, LI Li-chi 2, DA Liang-jun 1   

  1. 1. Department of Environment Science, East China Normal University, Shanghai 200062, China;
    2. International Cooperation Division, Yunnan Academy of Agricultural Sciences, Kunming 650205, China
  • Received:2011-06-01 Revised:2011-09-01 Online:2012-07-25 Published:2014-12-15

Abstract: This paper quantified the weed and species removal effect of N&P respectively, and definite the yearly absorption and removal effect of N&P in farmland soil and runoff by weed in the natural approximating ecological agro-ditches in Dianchi Lake basin, to provide the evidence of water eutrophication comprehensive treatment in agro-diffused pollution by cutting N&P effectively and source control. The result proved: ① There is a great difference of N&P enrichment among different weeds, in the same or different species of different periods; ② the main phenomenon of N&P enrichment of natural approximating weed plant is N limitation (N〖DK〗∶P<14); ③ there is positive relationship between N&P nutrient absorption and the weed biomass in natural approximating ecological agro-ditch of farmland, and the whole year total amount of N&P in the basin were N (37.86±9.9) kg/hm2, P (27±1.19) kg/ha, which were much lower than the maximum of N 113.16 kg/ha, P 10.14 kg/hm2.

Key words: Dianchi Lake basin, near nature weeds, eco-ditch system, N,P enrichment

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