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Chen, Z.; Ding, W.; Xu, Y.; M&uuml;ller, C.; Yu, H. &amp; Fan, J. (2016): <b>Increased N2O emissions during soil drying after waterlogging and spring thaw in a record wet year</b>. <i>Soil Biology &amp; Biochemistry</i> <b>101</b>, 152-164<br>DOI: <a href="http://dx.doi.org/10.1016/j.soilbio.2016.07.016" target="_blank">http://dx.doi.org/10.1016/j.soilbio.2016.07.016</a>.

Resource Description

Title: Increased N2O emissions during soil drying after waterlogging and spring thaw in a record wet year
FOR816dw ID: 5
Publication Date: 2016-07-17
License and Usage Rights: DASIM data user agreement. (www.dasim.de/dataagreementp3.do)
Resource Owner(s):
Individual: Zengming Chen
Contact:
Individual: Weixin Ding
Contact:
Individual: Yehong Xu
Contact:
Individual: Christoph Müller
Contact:
Individual: Hongyan Yu
Contact:
Individual: Jianling Fan
Contact:
Abstract:
Global climate change is expected to increase the frequency and intensity of extreme precipitation events, which can dramatically alter soil nitrous oxide (N2O) emissions. However, our ability to predict this effect is limited due to the lack of studies under real-world conditions. We conducted a field experiment in a maize-cultivated black soil in northeast China with six treatments: control without nitrogen (N) application (CK) and N-fertilized treatments with the ratio of urea N to manure N at 100:0 (NPK), 75:25 (OM1), 50:50 (OM2), 25:75 (OM3) and 0:100 (OM4). The experimental year was the wettest on record with an extreme rainfall event of 178 mm occurring in summer 2013. Annual N2O emissions from CK and NPK were increased by 168% and 171%, respectively, relative to normal wet years. Extreme rainfall saturated soils, resulted in low N2O fluxes (<20 ?g N m?2 h?1) lasting for 25 d. However, N2O flux peaked (169–264 ?g N m?2 h?1) in all treatments as the soil dried. Total N2O emissions were 0.43–0.74 kg N ha?1 over the drying period, accounting for 47.5–51.2% of the annual budget. High N2O fluxes occurred when the ratio of soil nitrate (NO3?) to dissolved organic carbon was 0.07–0.10 mg N mg?1 C, NO3? concentration was >3 mg N kg?1 and water-filled pore space was 67–76%. Distinctly higher N2O fluxes were also identified during the spring thaw period, accumulating to 20.1–49.4% of the non-growing season emissions. Emissions upon thawing were likely related to denitrification induced by high moisture conditions as a result of lag effect of the extreme rainfall. Annual N2O emissions progressively reduced as the ratio of urea N:manure N shifted towards manure, which was also the case during soil drying after waterlogging. Total N2O emissions were reduced by 25.6% for OM4 than NPK. Overall, our results suggest that soil N2O emissions were increased in the record wet year but a shift from urea towards manure with more N applied as starter N can minimize the N2O losses.<br/> <br/> N2O emissions were increased in a record wet year with an extreme rainfall event.<br/> Higher N2O fluxes occurred during soil drying after waterlogging and spring thaw.<br/> N2O peaked at 67–76% WFPS, NO3?/DOC at 0.07–0.10 mg N mg?1 C and NO3? >3 mg N kg?1.<br/> The effects of extreme weather events on soil N2O emissions require further research.
Keywords:
| soil drying | spring thaw | manure application | climate change | extreme rainfall | nitrous oxide |
Literature type specific fields:
ARTICLE
Journal: Soil Biology & Biochemistry
Volume: 101
Page Range: 152-164
Metadata Provider:
Individual: Kristina Kleineidam
Contact:
Online Distribution:
Download File: fb08-dasim.bot2.bio.uni-giessen.de/tmf_stuts1.3_ant/publications.do?citid=5

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