研究表明植物能够维持陆地硅循环 作者： 发布时间：/9/4 20:02:24 比利时列日大学F. de Tombeur研究组取得最新进展。他们表明植物在生态系统退化期间维持陆地硅循环。相关论文于9月4日发表在《科学》杂志上。
他们表明，在长期的生态系统发展过程中，澳大利亚西部200万年的土壤时列，陆地硅循环从生态学转向生物控制。硅的有效性取决于新生土壤中的成硅作用，旧土壤中植物来源的、作为成土池中回收利用的硅逐渐枯竭。与主要养分的浓度在强烈风化的土壤中显著下降不同，叶片硅的浓度随着土壤的老化而持续增加。他们的发现表明，在生态系统退化期间，植物对硅的保留维持了其陆地循环，这表明在营养缺乏的环境中，与这种元素相关的重要植物受益。
据悉，生物地球化学硅的周期影响着全球的初级生产力和碳循环，但是，人们对陆地生态系统长期发展过程中硅源和循环的变化知之甚少。
附：英文原文
Title: Plants sustain the terrestrial silicon cycle during ecosystem retrogression
Author: F. de Tombeur, B. L. Turner, E. Lalibert , H. Lambers, G. Mahy, M.-P. Faucon, G. Zemunik, J.-T. Cornelis
Issue Volume: /09/04
Abstract: 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.
DOI: 10.1126/science.abc0393
Source:
期刊信息 Science：《科学》，创刊于1880年。隶属于美国科学促进会，最新IF：41.037官方网址：投稿链接：
