کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8363689 | 1542592 | 2016 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Long-term reactive nitrogen loading alters soil carbon and microbial community properties in a subalpine forest ecosystem
ترجمه فارسی عنوان
بارگیری نیتروژن واکنش پذیر بلند مدت کربن خاک و خواص جامعه میکروبی در یک اکوسیستم جنگل ساحلی تغییر می کند
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کلمات کلیدی
رسوب نیتروژن، بیوماس میکروبی، دوچرخه سواری کربن خاک، آنزیم ها، جامعه میکروبی،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش خاک شناسی
چکیده انگلیسی
Elevated nitrogen (N) deposition due to increased fossil fuel combustion and agricultural practices has altered global carbon (C) cycling. Additions of reactive N to N-limited environments are typically accompanied by increases in plant biomass. Soil C dynamics, however, have shown a range of different responses to the addition of reactive N that seem to be ecosystem dependent. We evaluated the effect of N amendments on biogeochemical characteristics and microbial responses of subalpine forest organic soils in order to develop a mechanistic understanding of how soils are affected by N amendments in subalpine ecosystems. We measured a suite of responses across three years (2011-2013) during two seasons (spring and fall). Following 17 years of N amendments, fertilized soils were more acidic (control mean 5.09, fertilized mean 4.68), and had lower %C (control mean 33.7% C, fertilized mean 29.8% C) and microbial biomass C by 22% relative to control plots. Shifts in biogeochemical properties in fertilized plots were associated with an altered microbial community driven by reduced arbuscular mycorrhizal (control mean 3.2Â mol%, fertilized mean 2.5Â mol%) and saprotrophic fungal groups (control mean 17.0Â mol%, fertilized mean 15.2Â mol%), as well as a decrease in N degrading microbial enzyme activity. Our results suggest that decreases in soil C in subalpine forests were in part driven by increased microbial degradation of soil organic matter and reduced inputs to soil organic matter in the form of microbial biomass.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 92, January 2016, Pages 211-220
Journal: Soil Biology and Biochemistry - Volume 92, January 2016, Pages 211-220
نویسندگان
Claudia M. Boot, Ed K. Hall, Karolien Denef, Jill S. Baron,