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Title: Stimulation of nitrogen turnover due to nutrients release from aggregates affected by freeze-thaw in wetland soils
Author: Y. Song, Y. C. Zou, G. P. Wang and X. F. Yu
Corresponding Author: 于晓菲
Source: Physics and Chemistry of the Earth
Issued Date: 2017
DOI: 10.1016/j.pce.2016.12.005
Volume: 97, Pages:3-11
Abstract: 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 degrees C to - 10 degrees C, whereas the control group was incubated at the constant temperature of 10 degrees 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 NO3- content, respiration rate and gross nitrification rate were all significantly improved by the freeze-thaw effect. Because the amount of NH4- and NO3- 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. (C) 2016 Elsevier Ltd. All rights reserved.
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Content Type: 期刊论文
URI: http://ir.iga.ac.cn/handle/131322/7620
Appears in Collections:湿地与全球变化学科组_期刊论文

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