Soil parent material-A major driver of plant nutrient limitations in terrestrial ecosystems
Soil parent material-A major driver of plant nutrient limitations in terrestrial ecosystems
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DOI：
10.1111/gcb.13691
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发表时间：
2017-09-01
影响因子：
11.6
通讯作者：
Ringeval, Bruno
中科院分区：
文献类型：
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作者：
Augusto, Laurent;Achat, David L.;Ringeval, Bruno
由于陆地生态系统固定碳的能力受到养分供应的限制，因此了解养分如何限制植物生长是当代的一个关键问题。然而，导致全球范围内营养限制的原因仍有待澄清。利用全球植物生长、植物营养状况和土壤肥力的数据，我们调查了土壤母质在多大程度上解释了养分限制。我们发现，氮限制与土壤母质无关，但最好用气候来解释：生态系统在恶劣的环境下（即，寒冷和/或干燥）气候下的生态系统比更有利的气候下的生态系统更受N限制。与氮限制相反，磷限制不是由气候驱动的，而是由成土母质驱动的。成土母质的影响是土壤实际磷库与成土母质的理化性质（酸度、磷含量）密切相关的结果。其他一些与地面有关的因素（即，土壤风化程度、地形地貌等因素对土壤磷限制有显著影响，但其作用相对小于地质因素。N限制与P限制的相对重要性解释了气候和土壤母质的组合：在全球范围内，N限制变得突出的气候限制，但这种全球趋势是调制在较低的尺度上的影响母质对P限制，特别是在气候有利于生物活动。与土壤母质相比，大气沉降对全球实际养分限制分布的影响很小。我们的工作推进了我们对全球范围内营养限制分布的理解。特别是，它强调需要考虑土壤母质时，调查植物生长对环境变化的反应。
Because the capability of terrestrial ecosystems to fix carbon is constrained by nutrient availability, understanding how nutrients limit plant growth is a key contemporary question. However, what drives nutrient limitations at global scale remains to be clarified. Using global data on plant growth, plant nutritive status, and soil fertility, we investigated to which extent soil parent materials explain nutrient limitations. We found that N limitation was not linked to soil parent materials, but was best explained by climate: ecosystems under harsh (i.e., cold and or dry) climates were more N-limited than ecosystems under more favourable climates. Contrary to N limitation, P limitation was not driven by climate, but by soil parent materials. The influence of soil parent materials was the result of the tight link between actual P pools of soils and physical-chemical properties (acidity, P richness) of soil parent materials. Some other ground-related factors (i.e., soil weathering stage, landform) had a noticeable influence on P limitation, but their role appeared to be relatively smaller than that of geology. The relative importance of N limitation versus P limitation was explained by a combination of climate and soil parent material: at global scale, N limitation became prominent with increasing climatic constraints, but this global trend was modulated at lower scales by the effect of parent materials on P limitation, particularly under climates favourable to biological activity. As compared with soil parent materials, atmospheric deposition had only a weak influence on the global distribution of actual nutrient limitation. Our work advances our understanding of the distribution of nutrient limitation at global scale. In particular, it stresses the need to take soil parent materials into account when investigating plant growth response to environment changes.