Responses of biomass accumulation and nutrient utilization along a phosphorus supply gradient in Leymus chinensis.

A highly significant linear regression relationship between biomass and plant P accumulation was fitted for Leymus chinensis ( p < 0.05; Fig. 8 a,b).

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Effect of P supply gradient on nutrient accumulation in Leymus chinensis P accumulation in the belowground and aboveground parts of Leymus chinensis showed a trend of increasing and then decreasing with increasing P application, and the P accumulation in the belowground and aboveground parts of Leymus chinensis significantly increased with the application of 30.6 ~ 45.9 kg ha −1 P ( p < 0.05; Fig. 4 a,b).

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With an increase in P application, the N:P ratio showed a decreasing trend for Leymus chinensis during the harvest period, decreasing by 11.46%, 9.15%, and 18.38% in P 1 , P 2 , and P 3 , respectively, compared with P 0 .

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