Microscopy and spectroscopy analysis of carbon nanostructures in highly fertile Amazonian anthrosoils

详细信息	查看全文 | 推荐本文 |

• 作者：A. Jorio^a ; ^{adojorio@fisica.ufmg.br} ; J. Ribeiro-Soares^a ; L.G. Canç ; ado^a ; N.P.S. Falcã ; o^b ; H.F. Dos Santos^c ; D.L. Baptista^d ; E.H. Martins Ferreira^d ; B.S. Archanjo^d ; C.A. Achete^d ; ^e
• 关键词：Amazonian Dark Earth ; Soil fertility ; Carbon ; Electron microscopy ; Electron energy loss spectroscpy ; Raman spectroscopy
• 刊名：Soil & Tillage Research
• 出版年：2012
• 期刊代码：95_01671987
• 类别：abs
• 出版时间：June, 2012
• 卷：122
• 期：Complete
• 页码：61-66
• 文件大小：802 K

摘要

The anthropogenic Amazonian soil 鈥淭erra Preta de 脥ndio鈥?(Amazonian Dark Earth) provides a potential model for a sustainable land-use system in the humid tropics. A large amount of carbon-based materials in this soil is responsible for its high fertility over long periods of usage, and soil scientists are trying to create 鈥淭erra Preta Nova鈥?(New Dark Earth) by adding charcoal as a soil conditioner. By applying materials science tools, including scanning and transmission electron microscopy, energy dispersive X-ray, electron energy loss spectroscopy and Raman spectroscopy, we show that these millenary carbon materials exhibit a complex morphology, with particles ranging in size from micro- to nanometers, from the core to the surface of the carbon grains. From one side, our results might elucidate how nature solved the problem of keeping high levels of ion exchange capacity in these soils. From the other side, morphology and dimensionality are the key issues in nanotechnology, and the structural aspects revealed here may help generating the Terra Preta Nova, effectively improving world agriculture and ecosystem sustainability.