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首页> 外文期刊>Global change biology >Potassium limits potential growth of bog vegetation under elevated atmospheric CO2 and N deposition
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Potassium limits potential growth of bog vegetation under elevated atmospheric CO2 and N deposition

机译：钾限制了大气二氧化碳和氮沉降升高下沼泽植被的潜在生长

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The free air carbon dioxide enrichment (FACE) and N deposition experiments on four ombrotrophic bogs in Finland, Sweden, the Netherlands and Switzerland, revealed that after three years of treatment: (1) elevated atmospheric CO2 concentration had no significant effect on the biomass growth of Sphagnum and vascular species; and (2) increased N deposition reduced Sphagnum growth, because it increased the cover of vascular plants and the tall moss Polytrichum strictum , while vascular plant biomass growth was not affected. This paper focuses on water chemistry, plant nutrient content, and litter decomposition rates. Potassium limitation, or low supply of K and P, may have prevented a significant increase of Sphagnum growth under elevated CO2 and N deposition. Vascular plant growth under elevated CO2 and N deposition was also limited by K, or by K in combination with P or N (N in CO2 experiment). Elevated CO2 and N deposition had no effect on decomposition rates of Sphagnum and vascular plant litter. Aside from a possible effect of N deposition on light competition between species, we expect that elevated atmospheric CO2 and N deposition concentrations will not affect Sphagnum and vascular plant growth in bogs of north-west Europe due to K-, or K in combination with N- or P-, limited growth. For the same reason we expect no effect of elevated CO2 and N deposition on litter decomposition. Net primary production of raised ombrotrophic bogs that are at or close to steady state, is regulated by input of nutrients through atmospheric deposition. Therefore, we hypothesize that the expected increase of plant growth under elevated CO2 and N deposition is diminished by current levels of K (and to some extent P and N) in atmospheric deposition. [References: 23]
机译：在芬兰，瑞典，荷兰和瑞士的四个混养营养池上进行的自由空气二氧化碳富集（FACE）和N沉积实验表明，经过三年的处理：（1）大气CO2浓度升高对生物量的生长没有显着影响泥炭藓和维管束物种; （2）氮的沉积增加会降低泥炭藓的生长，因为它增加了维管植物的覆盖率和高苔藓的Polytrichumstrictum，而维管植物的生物量却没有受到影响。本文着重于水化学，植物养分含量和凋落物分解率。钾的限制或钾和磷的低供应可能阻止了在增加的CO2和N沉积下泥炭的生长。钾，或钾与磷或氮的结合（在二氧化碳实验中为氮）也限制了在高CO2和N沉积下维管植物的生长。较高的CO2和N沉积量对泥炭和维管植物凋落物的分解速率没有影响。除了氮沉积对物种之间光竞争的可能影响外，我们预计由于K-或K与N的组合，升高的大气CO2和N沉积浓度不会影响西北欧洲沼泽的泥炭藓和维管束植物的生长。 -或P-，增长有限。出于同样的原因，我们预计升高的CO2和N沉积对凋落物分解没有影响。处于或接近稳态的升高的营养养护沼泽的净初级生产力受大气中养分的输入调节。因此，我们假设在大气沉积物中当前的钾水平（以及一定程度上的磷和氮）降低了二氧化碳和氮沉积增加下植物生长的预期增长。 [参考：23]

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