Simulating the effects of soil temperature and moisture in the off-rice season on rice straw decomposition and subsequent CH4 production during the growth season in a paddy soil

Tang, Shuirong; Cheng, Weiguo; Hu, Ronggui; Guigue, Julien; Kimani, Samuel Munyaka; Tawaraya, Keitaro; Xu, Xingkai

doi:10.1007/s00374-016-1114-8

Cited by 60 publications

(22 citation statements)

References 36 publications

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“…Tang et al . proved that rice straw decomposition in fallow season led to a decrease in CH 4 emission during the subsequent rice season19. In contrast, it was fresh (early rice) straw that was embedded into soil in late rice season.…”

Section: Discussionmentioning

confidence: 98%

“…A few studies have reported that transferring surplus rice straw from paddy system to upland system is an effective practice to improve organic matter, fertility, and productivity of upland soils58. Some studies investigated the in situ rice straw management on GHG emissions, and found that straw mulching, straw off-season application and straw-derived biochar application could decrease the GWP compared with the incorporation of fresh straw into soil1718192021. However, the effectiveness of rice straw ex situ application on mitigation of CH 4 and N 2 O has not been studied yet.…”

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confidence: 99%

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Mitigating effects of ex situ application of rice straw on CH4 and N2O emissions from paddy-upland coexisting system

Wang

Chen

et al. 2016

Sci Rep

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The in situ application of rice straw enhances CH4 emissions by a large margin. The ex situ application of rice straw in uplands, however, may mitigate total global warming potential (GWP) of CH4 and N2O emissions from paddy-upland coexisting systems. To evaluate the efficiency of this practice, two field trials were conducted in rice-rice-fallow and maize-rape cropping systems, respectively. Year-round measurements of CH4 and N2O emissions were conducted to evaluate the system-scaled GWP. The results showed that CH4 accounted for more than 98% of GWP in paddy. Straw removal from paddy decreased 44.7% (302.1 kg ha−1 yr−1) of CH4 emissions and 51.2% (0.31 kg ha−1 yr−1) of N2O emissions, thus decreased 44.8% (7693 kg CO2-eqv ha−1 yr−1) of annual GWP. N2O accounted for almost 100% of GWP in upland. Straw application in upland had insignificant effects on CH4 and N2O emissions, which increased GWP only by 91 kg CO2-eqv ha−1 yr−1. So, the transfer of straw from paddy to upland could decrease GWP by 7602 kg CO2-eqv ha−1 yr−1. Moreover, straw retention during late rice season contributed to 88.2% of annual GWP increment. It is recommended to transfer early rice straw to upland considering GWP mitigation, nutrient recycling and labor cost.

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Section: Discussionmentioning

confidence: 98%

mentioning

confidence: 99%

Mitigating effects of ex situ application of rice straw on CH4 and N2O emissions from paddy-upland coexisting system

Wang

Chen

et al. 2016

Sci Rep

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“…The similar rates of CO 2 production at the end of the experiment are also consistent with a lack of effect of flooding on soil microbial function. Studies in which rice straw was incorporated into the soil (Tang et al 2016) have shown that the production of CH 4 and CO 2 under anaerobic conditions were lowest at higher temperatures because the residues were highly decomposed due to the previous aerobic conditions. Therefore, as our experiment was developed under a simulated spring flood event, the production of these two gases was expected.…”

Section: Soil Greenhouse Gas Emissionsmentioning

confidence: 99%

Crop residues exacerbate the negative effects of extreme flooding on soil quality

et al. 2017

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Extreme flood events are predicted to have a negative impact on soil quality. Currently, there is a lack of information about the effect of agricultural practices on soil functioning and microbial processes under these events. We hypothesized that the impact of flooding on soil quality will be exacerbated when crop residues are present in the soil as they will induce more extreme anaerobicity. A spring extreme flood event (10°C, 9 weeks) was simulated in mesocosms containing an arable sandy-loam soil low in nutrients. The main treatments were (1) with and without flooding and (2) with and without maize residue addition (8 Mg ha −1 ). We monitored changes in soil chemical quality indicators (e.g. pH, salinity, Fe 3+ , P, C, NH 4 + , NO 3 − and organic N), greenhouse gas (GHG) emissions (CO 2 , CH 4 , N 2 O) and soil microbial community composition (PLFAs) during a prolonged flood period (9 weeks) and an 8-week Brecovery^period after flooding. In comparison to the other treatments, flooding in the presence of crop residues resulted in a dramatic drop in soil redox potential. This was associated with the enhanced release of Fe and C into solution and an increase in CH 4 emissions. In contrast, maize residues reduced potential nitrate losses and N 2 O emissions, possibly due to complete denitrification and microbial N immobilization. Both flooding and maize residues stimulated microbial growth and promoted a shift in microbial community composition. Following floodwater removal, most of the soil quality indicators returned to the levels of the control treatment within 5 weeks. After this short recovery phase, no major impact of flooding could be observed on plant growth (maize pot-grown). Overall, we conclude that both extreme flooding and management regime negatively impact upon a range of soil quality indicators (e.g. redox, GHG emissions); however, the soil showed high resilience and recovered quickly after floodwater removal. Further work is required to investigate the impact of repeated extreme flood events on soil quality and function over longer timescales.

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“…On the contrary, tillage allows rice residues to contact the soil, and soil microorganisms accelerate the decomposition of organic matter and facilitate CH 4 production and emission in the fallow season (Pandey et al, 2012;Hussain et al, 2015). Tillage may also play a key role in CH 4 emission during the following rice season owing to the incompletely decomposed rice residues (Tang et al, 2016). In addition, tillage during the winter fallow season may increase N 2 O emissions, but the extent of this is not clear.…”

Section: Introductionmentioning

confidence: 99%

Drainage and tillage practices in the winter fallow season mitigate CH<sub>4</sub> and N<sub>2</sub>O emissions from a double-rice field in China

Zhang

Fan

et al. 2016

Atmos. Chem. Phys.

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Abstract. Traditional land management (no tillage, no drainage, NTND) during the winter fallow season results in substantial CH4 and N2O emissions from double-rice fields in China. A field experiment was conducted to investigate the effects of drainage and tillage during the winter fallow season on CH4 and N2O emissions and to develop mitigation options. The experiment had four treatments: NTND, NTD (drainage but no tillage), TND (tillage but no drainage), and TD (both drainage and tillage). The study was conducted from 2010 to 2014 in a Chinese double-rice field. During winter, total precipitation and mean daily temperature significantly affected CH4 emission. Compared to NTND, drainage and tillage decreased annual CH4 emissions in early- and late-rice seasons by 54 and 33 kg CH4 ha−1 yr−1, respectively. Drainage and tillage increased N2O emissions in the winter fallow season but reduced it in early- and late-rice seasons, resulting in no annual change in N2O emission. Global warming potentials of CH4 and N2O emissions were decreased by 1.49 and 0.92 t CO2 eq. ha−1 yr−1, respectively, and were reduced more by combining drainage with tillage, providing a mitigation potential of 1.96 t CO2 eq. ha−1 yr−1. A low total C content and high C / N ratio in rice residues showed that tillage in the winter fallow season reduced CH4 and N2O emissions in both early- and late-rice seasons. Drainage and tillage significantly decreased the abundance of methanogens in paddy soil, and this may explain the decrease of CH4 emissions. Greenhouse gas intensity was significantly decreased by drainage and tillage separately, and the reduction was greater by combining drainage with tillage, resulting in a reduction of 0.17 t CO2 eq. t−1. The results indicate that drainage combined with tillage during the winter fallow season is an effective strategy for mitigating greenhouse gas releases from double-rice fields.

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Simulating the effects of soil temperature and moisture in the off-rice season on rice straw decomposition and subsequent CH4 production during the growth season in a paddy soil

Cited by 60 publications

References 36 publications

Mitigating effects of ex situ application of rice straw on CH4 and N2O emissions from paddy-upland coexisting system

Mitigating effects of ex situ application of rice straw on CH4 and N2O emissions from paddy-upland coexisting system

Crop residues exacerbate the negative effects of extreme flooding on soil quality

Drainage and tillage practices in the winter fallow season mitigate CH<sub>4</sub> and N<sub>2</sub>O emissions from a double-rice field in China

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Simulating the effects of soil temperature and moisture in the off-rice season on rice straw decomposition and subsequent CH4 production during the growth season in a paddy soil

Cited by 60 publications

References 36 publications

Mitigating effects of ex situ application of rice straw on CH4 and N2O emissions from paddy-upland coexisting system

Mitigating effects of ex situ application of rice straw on CH4 and N2O emissions from paddy-upland coexisting system

Crop residues exacerbate the negative effects of extreme flooding on soil quality

Drainage and tillage practices in the winter fallow season mitigate CH&lt;sub&gt;4&lt;/sub&gt; and N&lt;sub&gt;2&lt;/sub&gt;O emissions from a double-rice field in China

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Drainage and tillage practices in the winter fallow season mitigate CH<sub>4</sub> and N<sub>2</sub>O emissions from a double-rice field in China