کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2024584 1542606 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Localization of soil organic matter in soil aggregates using synchrotron-based X-ray microtomography
ترجمه فارسی عنوان
محلی سازی مواد آلی خاک در خاکهای خاک با استفاده از میکروتوموگرافی اشعه ایکس مبتنی بر سنکروترون
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
چکیده انگلیسی


• A novel method is introduced to non-invasively locate soil organic matter in 3D.
• We use synchrotron based X-ray microtomography in combination with osmium staining.
• An X-ray absorption edge allows mapping of osmium specifically bound to OM.
• The results fill an important gap in deterministic modelling of OM turnover.

Modelling carbon mineralisation in natural soils is a major topic in soil and climate research. Current models need to be improved to include soil structure as an influencing factor to better predict C fluxes between pedosphere and atmosphere and to estimate carbon sequestration potentials. Geometry-based mechanistic modelling approaches have recently been developed to systematically study the effect of soil structure on carbon decomposition. Such models require spatially explicit input parameters describing the architecture of the pore space and the heterogeneous distribution of microbes and organic matter as decomposable substrate. The latter is very difficult to determine in situ, resulting in increased uncertainty in the models. To obtain more realistic input data, we have developed a novel approach to locate soil organic matter (SOM) in undisturbed aggregates of soil using a combination of synchrotron-based X-ray microtomography and osmium as a staining agent for SOM. Here, we present the first results using 5 mm sized soil aggregate samples with contrasting C-contents in which we obtained maps of organic matter distributions in relation to the pore networks at the aggregate scale.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 78, November 2014, Pages 189–194
نویسندگان
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