کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
4381764 1617774 2017 7 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Labile carbon input determines the direction and magnitude of the priming effect
ترجمه فارسی عنوان
تعیین جهت و بزرگی اثر آغازگری با ورودی کربن ناپایدار
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کلمات کلیدی
ردیاب ایزوتوپ 13C ؛ آغازگری ریزوسفر ؛ ترسیب کربن؛ ترشحات ریشه؛ چرخه مواد مغذی؛ تنفس خاک
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• Five levels of glucose applied weekly to four different soils for seven weeks.
• A positive linear relationship between glucose amounts and priming.
• Three soils showed substrate thresholds – minimum C input required to stimulate positive priming.
• Priming was not strongly related to soil microbial biomass.
• Labile C input increased priming and accelerated soil C cycling.

Labile carbon (C) input to soil can accelerate or slow the decomposition of soil organic matter, a phenomenon called priming. However, priming is difficult to predict, making its relationship with C input elusive. To assess this relationship, we added 13C-glucose at five levels (8 to 1606 μg C g−1 week−1) to the soil from four different ecosystems for seven weeks. We observed a positive linear relationship between C input and priming in all soils: priming increased from negative or no priming at low C input to strong positive priming at high C input. However, the sensitivity of priming to C input varied among soils and between ways of expressing C input, and decreased with elevation. Positive substrate thresholds were detected in three soils (56 to 242 μg C g−1 week−1), suggesting the minimum C input required to trigger positive priming. Carbon input expressed as a fraction of microbial biomass explained 16.5% less variation in priming than did C input expressed as a fraction of dry soil mass, indicating that priming is not strongly related to the size of the soil microbial biomass. We conclude that priming increases with the rate of labile C input, once that rate exceeds a threshold, but the magnitude of increase varies among soils. Further research on mechanisms causing the variation of priming sensitivity to increasing labile C input might help promote a quantitative understanding of how such phenomenon impacts soil C cycling, offering the potential to improve earth system models.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Soil Ecology - Volume 109, January 2017, Pages 7–13
نویسندگان
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