Plants sustain the terrestrial silicon cycle during ecosystem retrogression

doi:10.1126/science.abc0393

GSTDTAP > 气候变化

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
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).