【澳大利亚农业土壤固碳潜力】Shu Kee Lam Deli Chen Arvin R. Mosier & Richard Roush. The potential for carbon sequestration in Australian agricultural soils is technically and economically limited. Scientific Reports 3 Article number: 2179 doi:10.1038-srep02179

Abstract

Concerns about increasing concentrations of greenhouse gases in the atmosphere primarily carbon dioxide (CO₂) have raised worldwide interest in the potential of agricultural soils to be carbon (C) sinks. In Australia studies that have quantified the effects of improved management practices in croplands on soil C have generally been inconclusive and contradictory for different soil depths and durations of the management changes. We therefore quantitatively synthesised the results of Australian studies using meta-analytic techniques to assess the technical and economic feasibility of increasing the soil C stock by improved management practices. Our results indicate that the potential of these improved practices to store C is limited to the surface 0–10 cm of soil and diminishes with time. None of these widely adopted practices is currently financially attractive under Australia's new legislation known as the Carbon Farming Initiative.

【植物铁运输】Sébastien ThomineGrégory Vert . Iron transport in plants: better be safe than sorry.Current Opinion in Plant BiologyVolume 16 Issue 3 June 2013 Pages 322–327

Abstract

Iron is essential for plant cell function and more specifically for photosynthesis. Plants have evolved highly efficient systems to take up iron from the soil. However activating iron uptake is a double jeopardy: not only iron itself is toxic but iron uptake systems are poorly selective and allow the entry of other potentially toxic metals. Plants therefore tightly control iron uptake at the transcriptional and post-translational level and have evolved mechanisms to cope with the concomitant entry of toxic metals. In plant cells iron has to be distributed to chloroplasts and mitochondria or may be stored safely in vacuole. Distinct transcriptional networks regulating uptake and intracellular distribution are being uncovered while iron sensing mechanisms remain elusive.

【发展“低镉”大米】