Achieving low methane and nitrous oxide emissions with high economic incomes in a rice-based cropping system

Zhang, Guangbin; Ma, Jing; Yang, Yuting; Yu, Haiyang; Song, Kaifu; Dong, Yujiao; Lu, Shouxiang; Xu, Hong‐Guang

doi:10.1016/j.agrformet.2018.04.011

Cited by 32 publications

(14 citation statements)

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“…Seasonal N 2 O emissions from the main season ranged from 1.29 to 3.41 and 2.17 to 5.15 kg ha −1 for SR and MR + RR in the 3 years, respectively (Table 3). These results agreed with our former observations (Li et al, 2014;Zhang et al, 2018), but the amount of N 2 O emissions from the MR season was significantly higher than that measured by Xia et al (2016). The high N 2 O emissions during the main season from MR + RR plots are mainly due to topdressing I after the heading stage of MR. Cai et al (1997) revealed that N 2 O emissions significantly increased with the increase of the nitrogen fertilizer application rate.…”

Section: N 2 O Emissionssupporting

confidence: 92%

“…Net CH 4 emissions are the result of the combination of methanogenic production and methanotrophic oxidation in rice paddy fields (Feng, Xu, Yu, Xie, & Lin, 2012). In this study, soil Eh was in the range of −291 to −8 mV in the MR season for the two treatments (Figure 3), which was similar (−250 to 5 mV) to the result of Zhang et al (2018). The CH 4 was produced by methanogenic bacteria with soil Eh in the range of −200 to −150 mV (Zhang, Zhang, Ma, Xu, & Cai, 2010).…”

Section: Ch 4 Emissionssupporting

confidence: 64%

“…The relationship between CH 4 and N 2 O emissions from the ratoon rice-cropping system during the main rice and ratoon rice season from 2016 to 2018 rainfall occurred during the MR growing season in 2017 and correspondingly lower CH 4 emissions were observed (Table 3). Across experimental years and treatments, cumulative CH 4 emissions from the MR season ranged from 89.4 to 291 kg ha −1 for SR and MR + RR treatments (Table 3), which was slightly higher than in our previous studies (50.8-263 kg ha −1 ) (Zhang et al, 2018). There was no significant difference in CH 4 emissions from SR and MR + RR treatments in the first 2 years.…”

Section: Ch 4 Emissionsmentioning

confidence: 54%

“…Two treatments were adopted with four replicates: single rice (SR) and main rice crop followed by ratoon rice growth (MR + RR). Details on the experimental plots are provided by Lv, Zeng, Ren, and Zhang (2009) and Zhang et al (2018). After rice harvest, the rice straw was removed completely, and all experimental fields were kept fallow and drained well in the winter season.…”

Section: Field Sites and Experimental Designmentioning

confidence: 99%

“…The fluxes of CH 4 and N 2 O were also assessed as the weighted average fluxes based on the corresponding area in raised beds (chamber A) and ditches (chamber B). Therefore, the fluxes were calculated using the following equation (Zhang et al, 2018):…”

Section: Calculationsmentioning

confidence: 99%

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Methane and nitrous oxide emissions from a ratoon paddy field in Sichuan Province, China

Song

Zhang

et al. 2020

European J Soil Science

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Ratoon rice (RR) is a practice that involves achieving a second crop originating from the stubble left after the previous main rice crop (MR) harvest. There has been little previous study on methane (CH4) and nitrous oxide (N2O) emissions from ratoon paddy fields. A 3‐year field experiment was conducted to simultaneously measure CH4 and N2O emissions from traditional single rice (SR) and MR + RR fields in Sichuan Province, southwest China. The CH4 and N2O flux peaks were earlier for MR than SR. The CH4 emissions from the RR season accounted for 8–30% of total emissions from MR + RR. Compared with SR, MR + RR increased seasonal CH4 emissions by 3–15%. Correlation analysis showed that the seasonal variation of CH4 fluxes for MR + RR was significantly related to soil redox potential (Eh). The proportion of emitted N2O from RR to MR + RR was 11–42%. The average cumulative N2O emissions from MR and MR + RR were increased by 49 and 110% relative to those from SR plots across the 3 years, respectively. The global warming potential (GWP) of RR occupied 10–27% of MR + RR. The GWP of MR + RR was 7–62% higher than that of SR, and it was chiefly dependent on the contribution of CH4 emissions, despite the greater increase in N2O emissions. Grain yield in RR was 11–18% of that in MR + RR. MR + RR significantly increased rice yield by 19%, but the yield‐scaled GWP was comparable to SR. Our results suggest that MR + RR increases the amount of CH4 and N2O emissions from rice paddy fields and rice grain yield. The yield gaps of ratoon rice would be narrowed by optimizing field management practices to realize sustainable rice production under future climate change conditions. The CH4 and N2O emission peaks of ratoon rice were earlier than those of single rice. The CH4 and N2O emissions from ratoon rice fields were significantly higher than from single rice fields. Ratoon rice significantly increased yield and GWP compared to single rice. No significant difference in yield‐scaled GWP was observed between ratoon rice and single rice.Highlights The CH2 and N2O emission peaks of ratoon rice were earlier than those of single rice. The CH4 and N2O emissions from ratoon rice fields were significantly higher than from single rice fields. Ratoon rice significantly increased yield and GWP compared to single rice. No significant difference in yield‐scaled GWP was observed between ratoon rice and single rice.

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Section: N 2 O Emissionssupporting

confidence: 92%