Land-use practices such as mowing and nitrogen (N) fertilization can have significant impacts on plant stoichiometry. However, the interactive effects of mowing and N fertilization on the community-level plant stoichiometry and the underlying processes are not well understood. We examined the impacts of mowing (once a year) and N fertilization (12 g N m −2 yr −1 ) on the community-level plant stoichiometry in a semi-arid grassland on the Loess Plateau. Results obtained showed that mowing alone had no effect on the community-level plant N or phosphorus (P) concentration. N fertilization alone significantly reduced the community-level plant P concentration, but did not affect the community-level plant N concentration, leading to an enhancement of plant N:P ratio. However, mowing altered the effects of N fertilization, leading to a higher plant N (and P) concentration than the fertilization-only plots. Also, mowing significantly reduced soil nitrate (NO 3

中文翻译：

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割草通过改变半干旱草原中的植物功能基团来改变氮对社区一级植物化学计量的影响

割草和氮肥等土地利用做法可能对植物化学计量产生重大影响。但是，割草和氮肥对社区水平的植物化学计量学及其基本过程的交互作用尚不十分清楚。我们研究了黄土高原半干旱草原上割草（一年一次）和氮肥（12 g N m -2 yr -1）对社区一级植物化学计量的影响。获得的结果表明，单独修剪对群落水平的植物氮或磷（P）浓度没有影响。单独施用氮肥可显着降低社区一级植物P的浓度，但并未影响社区一级植物N的浓度，从而提高了植物N：P的比例。但是，割草改变了氮肥的作用，导致植物的氮（和磷）浓度高于仅施肥区。此外，割草显着减少了土壤硝酸盐（NO 3