کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9437708 | 1299850 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Degradability of dissolved soil organic carbon and nitrogen in relation to tree species
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
بوم شناسی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The degradability and chemical characteristics of water-extractable dissolved organic carbon (DOC) and nitrogen (DON) from the humus layer of silver birch (Betula pendula Roth), Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris L.) stands were compared in short-term incubation of soil solutions. For all extracts the degradation of DOC and DON was low (12-17% loss) and increased in the order: birch, spruce and pine. In the humus layer under pine a relatively larger pool of rapidly degrading dissolved soil organic matter (DOM) was indicated by the [3H]thymidine incorporation technique, which measures the availability of DOM to bacteria. The degradation of DOC was explained by a decrease in the hydrophilic fraction. For DON, however, both the hydrophilic and hydrophobic fractions tended to decrease during incubation. No major differences in concentrations of hydrophilic and hydrophobic fractions were detected between tree species. Molecular size distribution of DOC and DON, however, revealed slight initial differences between birch and conifers as well as a change in birch extract during incubation. The depletion of very rapidly degrading fractions (e.g., root exudates and compounds from the litter) may explain the low degradability of DOM in the humus layer under birch.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: FEMS Microbiology Ecology - Volume 53, Issue 1, 1 June 2005, Pages 33-40
Journal: FEMS Microbiology Ecology - Volume 53, Issue 1, 1 June 2005, Pages 33-40
نویسندگان
Oili Kiikkilä, Veikko Kitunen, Aino Smolander,