کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6408542 1629456 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Warming and increased precipitation enhance phenol oxidase activity in soil while warming induces drought stress in vegetation of an Arctic ecosystem
ترجمه فارسی عنوان
گرمایش و افزایش بارندگی، فعالیت های فنل اکسیداز را در خاک افزایش می دهد در حالی که گرمایش موجب تنش خشکی در گیاه اکوسیستم قطب شمال می شود
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- We performed a warming and increased precipitation experiment in an arctic ecosystem.
- Phenol oxidase activity was enhanced under warming with increased precipitation, but hydrolase activity was unaffected.
- Warming appears to induce drought stress in plants and enzymes.

Global climate change models predict that surface temperature and precipitation will increase in the Polar Regions. Arctic tundra soils contain a large amount of carbon, which may be vulnerable to decomposition under potential climate change. However, mechanistic understanding of the decomposition process and the consequent changes remains lacking. In the present study, we conducted a manipulation experiment at an arctic soil system in Cambridge Bay, Canada, where temperature and precipitation were increased artificially by installing open top chambers and adding distilled water during growing seasons. After one and half year of environmental manipulation, we investigated extracellular enzyme activities, which are related to decomposition, and analyzed stable isotope signatures (δ13C and δ15N) in soils and plants, which are related to water and nitrogen availability. Hydrolase (β-d-glucosidase, cellobiase, N-acetyl-glucosidase and aminopeptidase) activity did not differ significantly under different treatments. However, phenol-oxidase showed higher activity under warming combined with increased precipitation than under other treatments. Stable isotope ratio (δ13C) in plants revealed that drought stress in vegetation was induced under warming. We concluded that in the long term, climate change may amplify the feedback of soil to climate change in arctic tundra soil.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volumes 259–260, December 2015, Pages 347-353
نویسندگان
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