کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5743718 1617999 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nitrogen additions affect litter quality and soil biochemical properties in a peatland of Northeast China
ترجمه فارسی عنوان
افزودنی های نیتروژن بر کیفیت لیته و خواص بیوشیمی خاک در یک سرزمین اصلی شمال شرقی چین تاثیر می گذارد
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


- Plant N and P uptake and accumulation in a peatland are enhanced by N addition.
- N addition stimulates enzyme activity in litter potential promote it decomposition.
- N addition can lead to the loss of soil labile C in a peatland.
- Shallow soil invertase and urease are sensitive to N addition in a peatland.

Nitrogen (N) is a limiting nutrient in many peatland ecosystems. Enhanced N deposition, a major component of global climate change, affects ecosystem carbon (C) balance and alters soil C storage by changing plant and soil properties. However, the effects of enhanced N deposition on peatland ecosystems are poorly understood. We conducted a two-year N additions field experiment in a peatland dominated by Eriophorum vaginatum in the Da Xing'an Mountains, Northeast China. Four levels of N treatments were applied: (1) CK (no N added), (2) N1 (6 g N m−2 yr−1), (3) N2 (12 g N m−2 yr−1), and (4) N3 (24 g N m−2 yr−1). Plant and soil material was harvested at the end of the second growing season. N additions increased litter N and phosphorus (P) content, as well as β-glucosidase, invertase, and acid-phosphatase activity, but decreased litter C:N and C:P ratios. Litter carbon content remained unchanged. N additions increased available NH4+-N and NO3−-N as well as total Gram-positive (Gram+), Gram-negative (Gram−), and total bacterial phospholipid fatty acids (PLFA) in shallow soil (0-15 cm depth). An increase in these PLFAs was accompanied by a decrease in soil labile organic C (microbial biomass carbon and dissolved organic carbon), and appeared to accelerate decomposition and reduce the stability of the soil C pool. Invertase and urease activity in shallow soils and acid-phosphatase activity in deep soils (15-30 cm depth) was inhibited by N additions. Together, these findings suggest that an increase in N deposition in peatlands could accelerate litter decomposition and the loss of labile C, as well as alter microbial biomass and function.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 100, March 2017, Pages 175-185
نویسندگان
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