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| Titel |
Water-saving ground cover rice production system reduces net greenhouse gas fluxes in an annual rice-based cropping system |
| VerfasserIn |
Z. Yao, Y. Du, Y. Tao, X. Zheng, C. Liu, S. Lin, K. Butterbach-Bahl |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 22 ; Nr. 11, no. 22 (2014-11-17), S.6221-6236 |
| Datensatznummer |
250117677
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| Publikation (Nr.) |
 copernicus.org/bg-11-6221-2014.pdf |
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| Zusammenfassung |
| To safeguard food security and preserve precious water resources, the
technology of water-saving ground cover rice production system (GCRPS) is
being increasingly adopted for rice cultivation. However, changes in
soil water status and temperature under GCRPS may affect soil biogeochemical
processes that control the biosphere–atmosphere exchanges of methane
(CH4), nitrous oxide (N2O) and carbon dioxide (CO2). The
overall goal of this study is to better understand how net ecosystem
greenhouse gas exchanges (NEGE) and grain yields are affected by GCRPS in an
annual rice-based cropping system. Our evaluation was based on measurements
of the CH4 and N2O fluxes and soil heterotrophic respiration
(CO2 emissions) over a complete year, and the estimated soil
carbon sequestration intensity for six different fertilizer treatments for
conventional paddy and GCRPS. The fertilizer treatments included urea
application and no N fertilization for both conventional paddy (CUN and CNN)
and GCRPS (GUN and GNN), and solely chicken manure (GCM) and combined urea and
chicken manure applications (GUM) for GCRPS. Averaging across all the
fertilizer treatments, GCRPS increased annual N2O emission and grain
yield by 40 and 9%, respectively, and decreased annual CH4
emission by 69%, while GCRPS did not affect soil CO2 emissions
relative to the conventional paddy. The annual direct emission factors of
N2O were 4.01, 0.09 and 0.50% for GUN, GCM and GUM,
respectively, and 1.52% for the conventional paddy (CUN). The annual soil
carbon sequestration intensity under GCRPS was estimated to be an average of
−1.33 Mg C ha−1 yr−1, which is approximately 44% higher than
the conventional paddy. The annual NEGE were 10.80–11.02 Mg CO2-eq ha−1 yr−1
for the conventional paddy and 3.05–9.37 Mg CO2-eq ha−1 yr−1 for the GCRPS, suggesting the potential feasibility of
GCRPS in reducing net greenhouse effects from rice cultivation. Using organic
fertilizers for GCRPS considerably reduced annual emissions of CH4 and
N2O and increased soil carbon sequestration, resulting in the lowest
NEGE (3.05–5.00 Mg CO2-eq ha−1 yr−1). Accordingly,
water-saving GCRPS with organic fertilizer amendments was considered the
most promising management regime for simultaneously achieving relatively
high grain yield and reduced net greenhouse gas emission. |
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