Zhenjiang Institute of Agricultural Science of Hilly Regions in Jiangsu

Science of, China

Zhenjiang Institute of Agricultural Science of Hilly Regions in Jiangsu

Science of, China

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Liu G.,CAS Nanjing Institute of Soil Science | Liu G.,University of Chinese Academy of Sciences | Zhuang Y.,Zhenjiang Institute of Agricultural Science of Hilly Regions in Jiangsu | Yang J.,Zhenjiang Institute of Agricultural Science of Hilly Regions in Jiangsu | And 3 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014

A field experiment was conducted to investigate the effects of straw-decomposing microbial inoculants on the N2O flux from paddy fields under a rice-wheat rotation system during the rice growing season in the Yangtze River Valley. Seasonal variation of N2O flux was monitored using the method of static chamber-gas chromatography. Three treatments, i. e. even incorporation of wheat straw (S), incorporation of wheat straw treated with Ruilaite inoculant (SR), and incorporation of wheat straw treated with Jinkuizi inoculant (SJ), were tested in the experiment. Results show that the microbial inoculants did not show significant effect on seasonal variation of N2O flux, but did decrease the total N2O emission during the rice growing season by 12.7% in Treatment SR and 8.9% in Treatment SJ as compared with Treatment S. The mean N2O flux was 63.35, 57.68 and 55.30 μg · m-2 · h-1 for Treatment S, SJ and SR, respectively. N2O emissions mainly occurred during the midseason aeration period and the dry-wet alternation stage after re-flooding. No significant correlation was observed between N2O flux and soil temperature at depth of 5, 10, and 15 cm (p > 0.05).


Liu G.,CAS Nanjing Institute of Soil Science | Liu G.,University of Chinese Academy of Sciences | Yu H.,CAS Nanjing Institute of Soil Science | Yu H.,University of Chinese Academy of Sciences | And 5 more authors.
Science of the Total Environment | Year: 2015

Incorporation of straw together with microbial inoculant (a microorganism agent, accelerating straw decomposition) is being increasingly adopted in rice cultivation, thus its effect on greenhouse gas (GHG) emissions merits serious attention. A 3-year field experiment was conducted from 2010 to 2012 to investigate combined effect of straw and microbial inoculant on methane (CH4) and nitrous oxide (N2O) emissions, global warming potential (GWP) and greenhouse gas intensity (GHGI) in a rice field in Jurong, Jiangsu Province, China. The experiment was designed to have treatment NPK (N, P and K fertilizers only), treatment NPKS (NPK plus wheat straw), treatment NPKSR (NPKS plus Ruilaite microbial inoculant) and treatment NPKSJ (NPKS plus Jinkuizi microbial inoculant). Results show that compared to NPK, NPKS increased seasonal CH4 emission by 280-1370%, while decreasing N2O emission by 7-13%. When compared with NPKS, NPKSR and NPKSJ increased seasonal CH4 emission by 7-13% and 6-12%, respectively, whereas reduced N2O emission by 10-27% and 9-24%, respectively. The higher CH4 emission could be attributed to the higher soil CH4 production potential triggered by the combined application of straw and microbial inoculant, and the lower N2O emission to the decreased inorganic N content. As a whole, the benefit of lower N2O emission was completely offset by increased CH4 emission, resulting in a higher GWP for NPKSR (5-12%) and NPKSJ (5-11%) relative to NPKS. Due to NPKSR and NPKSJ increased rice grain yield by 3-6% and 2-4% compared to NPKS, the GHGI values for NPKS, NPKSR and NPKSJ were comparable. These findings suggest that incorporating straw together with microbial inoculant would not influence the radiative forcing of rice production in the terms of per unit of rice grain yield relative to the incorporation of straw alone. © 2015 Elsevier B.V.


PubMed | CAS Nanjing Institute of Soil Science, University of Chinese Academy of Sciences and Zhenjiang Institute of Agricultural Science of Hilly Regions in Jiangsu
Type: | Journal: The Science of the total environment | Year: 2015

Incorporation of straw together with microbial inoculant (a microorganism agent, accelerating straw decomposition) is being increasingly adopted in rice cultivation, thus its effect on greenhouse gas (GHG) emissions merits serious attention. A 3-year field experiment was conducted from 2010 to 2012 to investigate combined effect of straw and microbial inoculant on methane (CH4) and nitrous oxide (N2O) emissions, global warming potential (GWP) and greenhouse gas intensity (GHGI) in a rice field in Jurong, Jiangsu Province, China. The experiment was designed to have treatment NPK (N, P and K fertilizers only), treatment NPKS (NPK plus wheat straw), treatment NPKSR (NPKS plus Ruilaite microbial inoculant) and treatment NPKSJ (NPKS plus Jinkuizi microbial inoculant). Results show that compared to NPK, NPKS increased seasonal CH4 emission by 280-1370%, while decreasing N2O emission by 7-13%. When compared with NPKS, NPKSR and NPKSJ increased seasonal CH4 emission by 7-13% and 6-12%, respectively, whereas reduced N2O emission by 10-27% and 9-24%, respectively. The higher CH4 emission could be attributed to the higher soil CH4 production potential triggered by the combined application of straw and microbial inoculant, and the lower N2O emission to the decreased inorganic N content. As a whole, the benefit of lower N2O emission was completely offset by increased CH4 emission, resulting in a higher GWP for NPKSR (5-12%) and NPKSJ (5-11%) relative to NPKS. Due to NPKSR and NPKSJ increased rice grain yield by 3-6% and 2-4% compared to NPKS, the GHGI values for NPKS, NPKSR and NPKSJ were comparable. These findings suggest that incorporating straw together with microbial inoculant would not influence the radiative forcing of rice production in the terms of per unit of rice grain yield relative to the incorporation of straw alone.

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