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Impact of nitrogen availability and soil communities on biomass accumulation of an invasive species

机译:氮素供应和土壤群落对入侵物种生物量积累的影响

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摘要

Exotic plant species impact belowground processes by influencing resource availability through enhanced microbial activity as a consequence of litter inputs. We have little understanding of the impact of microbe-driven nutrient fluctuations on the biomass accumulation of invasive species. Here we attempt to answer the question on whether soil community-driven nitrogen availability influences invader biomass. We discovered that soil communities cultured by Ageratina adenophora, a neotropical invader in Asia, retain available nitrogen that influences the biomass of the invader. Through soil manipulation experiments we found that A. adenophora grows better in soil with a higher available nitrogen content. Ageratina adenophora-invaded soil had higher microbial activity and available nitrogen due to higher inputs of terpene-rich litter compared with soil not yet invaded by it. Our results provide evidence that microbe-linked nitrogen availability exerts a positive impact on A. adenophora biomass accumulation. Our work emphasizes the importance of soil community-driven nitrogen availability in invasion success.
机译:外来植物物种通过垫料输入而通过增强微生物活动来影响资源的利用,从而影响地下过程。我们对微生物驱动的养分波动对入侵物种生物量积累的影响了解甚少。在这里,我们试图回答关于土壤群落驱动的氮有效性是否影响入侵者生物量的问题。我们发现,亚洲新热带侵染者Ageratina adenophora培养的土壤群落保留了可影响侵袭者生物量的可用氮。通过土壤操纵实验,我们发现紫茎泽兰在具有较高可用氮含量的土壤中生长更好。与尚未入侵土壤的土壤相比,入侵富含紫茎泽兰的土壤具有更高的微生物活性和有效氮,这是由于富含萜类的凋落物的投入较高。我们的结果提供了证据,表明微生物相关氮的有效性对紫茎泽兰生物量的积累产生了积极的影响。我们的工作强调了土壤群落驱动的氮素在入侵成功中的重要性。

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