کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2025653 1070005 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Carbon routes from decomposing plant residues and living roots into soil food webs assessed with 13C labelling
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
پیش نمایش صفحه اول مقاله
Carbon routes from decomposing plant residues and living roots into soil food webs assessed with 13C labelling
چکیده انگلیسی

This field experiment investigated how C from fresh organic amendments and from a growing leek crop was allocated into different soil microbial and faunal groups in an arable field. A 13C-enriched red clover green manure was incorporated in one treatment, while the growing leek crop was pulse labelled with 13CO2 in another. Incorporation of 13C into microbial fatty acids, micro- and macroarthropods, enchytraeids and earthworms was determined on several occasions during the growing season in order to determine whether different groups or species of microorganisms and fauna were specialised on either the decomposing green manure material or root-derived C. Compound-specific stable isotope ratio analysis showed fatty acid markers of actinomycetes and Gram-positive bacteria to be more strongly linked to C originating from the decomposing green manure material, whereas the marker for arbuscular mycorrhizal fungi was more linked to C from the growing leek crop. In contrast, several markers for Gram-negative bacteria were the most 13C-enriched and had incorporated more 13C than the other phospholipid fatty acids in both treatments, indicating a general dominance irrespective of C source. Most soil fauna seemed to derive their C directly or indirectly from the decomposing plant material, while C from the growing crop appeared to be of secondary importance in this agroecosystem.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 40, Issue 10, October 2008, Pages 2530–2539
نویسندگان
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