کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5770400 1629424 2017 10 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Umbric Ferralsols along a climosequence from the Atlantic coast to the highlands of northeastern Brazil: Characterization and carbon mineralization
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موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Umbric Ferralsols along a climosequence from the Atlantic coast to the highlands of northeastern Brazil: Characterization and carbon mineralization
چکیده انگلیسی


- Umbric Ferralsols and deep SOM were assessed in areas surrounded by semi-arid region.
- Carbon storage of umbric horizon was higher in coastal areas than in highlands.
- Carbon accumulation was more influenced by available N than by the current climate.

A thick umbric horizon (~ 1 m) is an important component in the balance of the carbon (C) cycle. However, little is known about the characteristics and C stability in the umbric horizon of Ferralsols, the tropical environments surrounded by semi-arid regions in northeastern (NE) Brazil. This study aimed to evaluate (i) morphological, physical, chemical, biological and mineralogical attributes and (ii) C accumulation in the surface and subsurface within five Umbric Ferralsols along a 475-km climosequence from 143 to 963 m a.s.l. located in coastal and upland areas in NE Brazil. Soil samples were collected in all of the horizons. Umbric Ferralsols present characteristics that are primarily influenced by their sedimentary parent material, which are mostly kaolinitic. The texture ranges from sandy clay loam to very clayey with an absence of macroscopic coal in depth. There is greater C storage of the umbric horizon in the coastal areas with hot and humid climates. This indicates that the current climate is not the predominant factor in the formation of the umbric epipedon. C mineralization in the surface horizons was related to potentially mineralizable nitrogen (N) and labile and organic C, suggesting that the quality of the organic substrate and mainly the N dynamic can drive the accumulation of C. In contrast, C mineralization in subsurface horizons was primarily influenced by forms of aluminum and oxalate-extractable iron and was independent of soil organic matter fractions. However, in the umbric horizon, crystalline forms of iron were mainly associated with protection against C mineralization.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volume 293, 1 May 2017, Pages 34-43
نویسندگان
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