Results Aboveground Biomass of Different N&P Addition Rate ANCOVAS of aboveground biomass, using sites, N addition, P addition and all their interactions as fixed factors, and biomass in July as covariate, showed that the effects of different sites was highly significant on biomass of Compositae, other species and total biomass ( Table 2 ).
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Changes in Biomass and Quality of Alpine Steppe in Response to N & P Fertilization in the Tibetan Plateau.
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