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Titel |
The combined effects of nitrification inhibitor and biochar incorporation on yield-scaled N2O emissions from an intensively managed vegetable field in southeastern China |
VerfasserIn |
B. Li, C. H. Fan, Z. Q. Xiong, Q. L. Li, M. Zhang |
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 ; 12, no. 6 ; Nr. 12, no. 6 (2015-03-27), S.2003-2017 |
Datensatznummer |
250117884
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Publikation (Nr.) |
copernicus.org/bg-12-2003-2015.pdf |
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Zusammenfassung |
An experiment was conducted to study the influences of nitrification
inhibitor (NI) and biochar incorporation on yield-scaled N2O using the
static chamber method and gas chromatography in an intensively managed
vegetable field with seven consecutive vegetable crops from 2012 to 2014 in
southeastern China. With an equal annual nitrogen (N) application
rate (1217 kg N ha-1 yr-1), six treatments under three biochar
amendment rates – namely, 0 t ha-1 (C0), 20 t ha-1
(C1) and 40 t ha-1 (C2) – with compound fertilizer (CF) or urea
mixed with NI of nitrapyrin as chlorinated pyridine (CP) were studied in
these field experiments. The results showed that, although there was no significant
influence on soil organic carbon (SOC) content or total nitrogen (TN),
nitrapyrin could result in a significant increase in soil pH during the
experimental period. Nitrapyrin significantly decreased cumulative N2O
emissions by 15.9–32.1% while increasing vegetable yield by
9.8–41.9%. Thus, it also decreased yield-scaled N2O emissions
significantly. In addition to the differential responses of the soil pH,
biochar amendment significantly increased SOC and TN. Compared with the
treatments without biochar addition, the cumulative N2O emissions showed
no significant difference in the CF or the CP group treatments but increased
slightly (not significantly) by 7.9–18.3% in the CP group treatments.
Vegetable yield was enhanced by 7.1–49.5% in the CF group treatments
compared with the treatments without biochar amendment, while there was no
significant difference in the CP group treatments, and the yield-scaled N2O
emissions were thus decreased significantly. Furthermore, treatments
involving with nitrapyrin and biochar incorporation slightly increased yield-scaled
N2O emissions by 9.4%, on average, compared with CP-C0. Therefore,
the application of nitrapyrin could serve as an appropriate practice for
increasing vegetable yield and mitigating N2O emissions in intensively
managed vegetable fields and should be further examined in various
agroecosystems. |
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