کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9445287 | 1304285 | 2005 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of freeze-thaw cycles on microarthropods and nutrient availability in a sub-Arctic soil
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
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چکیده انگلیسی
There was no conclusive evidence that recurring freeze-thaw events had a negative effect on the investigated soil faunal groups, and the treatment even seemed to stimulate the abundance of Acaridida. Respiration of soil subjected to 16 freeze-thaw cycles was low when kept at â2 °C and high when kept at +2 °C, indicating rapid response of microbial activity even after long exposure to low and fluctuating temperatures. Oribatida and Gamasida displayed a higher abundance in controls kept at â2 °C for up to 80 days, compared to controls at +2 °C and the freeze-thaw treatment. The Collembola were unaffected by the temperature treatments, but increased in abundance over time. The microbial C:N ratio increased after 40 days at â2 °C, indicating a higher degree of fungal dominance and lower tolerance of bacteria to constant freezing, but not to freeze-thaw. The decline in inorganic and microbial P during the experiment, and the proportionally stronger decrease of inorganic and microbial P than N in frozen soil compared to +2 °C soil, suggests that P is affected more than N mineralisation by freezing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Soil Ecology - Volume 28, Issue 1, January 2005, Pages 79-93
Journal: Applied Soil Ecology - Volume 28, Issue 1, January 2005, Pages 79-93
نویسندگان
Heidi Sjursen, Anders Michelsen, Martin Holmstrup,