Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1126/science.abc0393 |
Plants sustain the terrestrial silicon cycle during ecosystem retrogression | |
F. de Tombeur; B. L. Turner; E. Laliberté; H. Lambers; G. Mahy; M.-P. Faucon; G. Zemunik; J.-T. Cornelis | |
2020-09-04 | |
发表期刊 | Science
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出版年 | 2020 |
英文摘要 | Silicon is an important element in plant tissues and contributes to structural defenses against herbivores and other stresses. However, the terrestrial biogeochemical cycling of silicon is poorly understood, particularly the relative importance of geochemical and biological mechanisms in its regulation. de Tombeur et al. studied this question in 2-million-year chronosequences of soil and vegetation in Western Australia. Sites became progressively more weathered and infertile as they aged, indicating that the silicon cycle shifts from geochemical to biological control as the ecosystem develops (see the Perspective by Carey). They found that foliar silicon concentrations increase continuously during ecosystem development, even though rock-derived silicon is depleted in the older soils. By contrast, other major rock-derived nutrients showed decreasing concentrations in plants. Hence, biological silicon cycling allows plants to maintain concentrations even under conditions of extreme soil infertility. Science , this issue p. [1245][1]; see also p. [1161][2] The biogeochemical silicon cycle influences global primary productivity and carbon cycling, yet changes in silicon sources and cycling during long-term development of terrestrial ecosystems remain poorly understood. Here, we show that terrestrial silicon cycling shifts from pedological to biological control during long-term ecosystem development along 2-million-year soil chronosequences in Western Australia. Silicon availability is determined by pedogenic silicon in young soils and recycling of plant-derived silicon in old soils as pedogenic pools become depleted. Unlike concentrations of major nutrients, which decline markedly in strongly weathered soils, foliar silicon concentrations increase continuously as soils age. Our findings show that the retention of silicon by plants during ecosystem retrogression sustains its terrestrial cycling, suggesting important plant benefits associated with this element in nutrient-poor environments. [1]: /lookup/doi/10.1126/science.abc0393 [2]: /lookup/doi/10.1126/science.abd9425 |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/293275 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | F. de Tombeur,B. L. Turner,E. Laliberté,et al. Plants sustain the terrestrial silicon cycle during ecosystem retrogression[J]. Science,2020. |
APA | F. de Tombeur.,B. L. Turner.,E. Laliberté.,H. Lambers.,G. Mahy.,...&J.-T. Cornelis.(2020).Plants sustain the terrestrial silicon cycle during ecosystem retrogression.Science. |
MLA | F. de Tombeur,et al."Plants sustain the terrestrial silicon cycle during ecosystem retrogression".Science (2020). |
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