کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5784622 | 1639341 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Stimulation of nitrogen turnover due to nutrients release from aggregates affected by freeze-thaw in wetland soils
ترجمه فارسی عنوان
تحریک گردش نیتروژن به علت انتشار مواد مغذی از دانه های تحت تاثیر یخ زدگی در خاک های تالاب
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کلمات کلیدی
یخزدن، مصالح، خاک های تالاب، کربن ارگانیک، انتشار نیتروژن،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
The freeze-thaw phenomenon will occur more frequently in mid-high latitude ecosystems under climate change which has a remarkable effect on biogeochemical processes in wetland soils. Here, we used a wet sieving procedure and a barometric process separation (BaPS) technique to examine the responses of wetland soil aggregates and related carbon and nitrogen turnover affected by the freeze-thaw treatment. Wetland soil samples were divided into a treatment group and a control group. The treatment group was incubated at temperatures fluctuating from 10 °C to â10 °C, whereas the control group was incubated at the constant temperature of 10 °C. A 24 h process was set as the total freeze-thaw cycle, and the experiment had 20 continuous freeze-thaw cycles. In our results, the freeze-thaw process caused great destruction to the >2 mm water-stable aggregates (WSA) fraction and increased the <0.053 mm WSA fraction. The dissolved organic carbon (DOC) content was stimulated during the initial freeze-thaw cycles followed by a rapid decline, and then still increased during subsequent freeze-thaw cycles, which was mainly determined by the soil organic carbon (SOC). The NH4+ and NO3â content, respiration rate and gross nitrification rate were all significantly improved by the freeze-thaw effect. Because the amount of NH4+ and NO3â expressed prominent negative responses to the content of >2 mm WSA fraction and the gross nitrification rate can be stimulated at the initial freeze-thaw cycles, nutrients and substrates may play a leading role in the freeze-thaw treatment regardless of the minimal influences on microbial biomass pools.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics and Chemistry of the Earth, Parts A/B/C - Volume 97, February 2017, Pages 3-11
Journal: Physics and Chemistry of the Earth, Parts A/B/C - Volume 97, February 2017, Pages 3-11
نویسندگان
Yang Song, Yuanchun Zou, Guoping Wang, Xiaofei Yu,