Plant absorption was not the main mechanism in reduction of both N and P, due to less plant biomass on wetland buffer zone.

缓冲带内的湿地植物量较小，决定了植物吸收并非氮磷去除的主要机制。

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There are obvious mutuality in the plant biomass, grain N content, Total amount of N absorption with yield, grain N content have maximal immediate effect to yield.

植株干重、子粒氮含量、总吸氮量与产量显著相关，子粒氮含量对产量的直接影响最大。

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