Rice straw incorporation affects global warming potential differently in early vs. late cropping seasons in Southeastern China

Wang, Weiqi; Lai, Derrick Y.F.; Sardans, Jordi; Chün, Wang; Datta, Arindam; Pan, Ting; Zeng, Chen; Bartrons, Mireia; Peñuelas, Josep

doi:10.1016/j.fcr.2015.07.007

Cited by 47 publications

(47 citation statements)

References 46 publications

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“…There was a significant negative correlation between CH 4 emissions and Soil Eh in the treated plots, suggesting that flooding decreased the Soil Eh and enhanced the conversion of carbonaceous compounds to CH 4 gas. There was a significant positive correlation between soil temperature and CH 4 emission which may be due to the temperature enhanced microbial CH 4 production (Wang et al, 2015). In addition, CH 4 emissionwas significantly positively correlated with soil pH for treatments CF and SWP 1, which is in contrast to the findings by Wang et al (2015).…”

Section: Effect Of Water Management On Seasonal Ch 4 Emissionsmentioning

confidence: 72%

“…There was a significant positive correlation between soil temperature and CH 4 emission which may be due to the temperature enhanced microbial CH 4 production (Wang et al, 2015). In addition, CH 4 emissionwas significantly positively correlated with soil pH for treatments CF and SWP 1, which is in contrast to the findings by Wang et al (2015).…”

Section: Effect Of Water Management On Seasonal Ch 4 Emissionsmentioning

confidence: 72%

“…For the treatments CF, SWPs 3, 4 and 5, N 2 O emissions showed a significant negative correlation with soil temperature, which implied that temperature, was not a restrictive factor for N 2 O emission (Wang et al, 2015).…”

Section: Seasonal N 2 O Emissions and Wfpsmentioning

confidence: 98%

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Greenhouse gas emission from direct seeded paddy fields under different soil water potentials in Eastern India

Kumar

Nayak

Mohanty

et al. 2016

Agriculture, Ecosystems & Environment

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Section: Effect Of Water Management On Seasonal Ch 4 Emissionsmentioning

confidence: 72%

Section: Effect Of Water Management On Seasonal Ch 4 Emissionsmentioning

confidence: 72%

See 1 more Smart Citation

Greenhouse gas emission from direct seeded paddy fields under different soil water potentials in Eastern India

Kumar

Nayak

Mohanty

et al. 2016

Agriculture, Ecosystems & Environment

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“…Similarly, Wang et al . reported that straw retention in late rice season increased much more CH 4 emission than in early rice season25. Late rice straw was partially oxidized during fallow season before being embedded into soil in early rice season.…”

Section: Discussionmentioning

confidence: 98%

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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“…To calculate GWP in CO 2 equivalents based on a 100year time horizon, seasonal CH 4 emissions were multiplied by a factor -u. Islam, et al Agriculture, Ecosystems and Environment 295 (2020) 106922 of 34 and seasonal N 2 O emissions by a factor of 298 (Hou et al, 2012;IPCC, 2013;Wang et al, 2015). The yield-scaled GHG emissions were calculated by dividing CO 2 -equivalents emissions by rice yield according to Van Groenigen et al (2010).…”

Section: Gas Sampling Analysis and Calculationmentioning

confidence: 99%

Reducing greenhouse gas emissions and grain arsenic and lead levels without compromising yield in organically produced rice

Islam

Neergaard

Sander

et al. 2020

Agriculture, Ecosystems & Environment

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A B S T R A C TFlooded rice production is crucial to global food security, but there are associated environmental concerns. In particular, it is a significant source of methane (CH4) and nitrous oxide (N2O) emissions and a large consumer of water resources, while arsenic levels in the grain are a serious health concern. There is also a tendency to use more organic fertilisers to close nutrient cycles, posing a threat of even higher GHG emissions and grain arsenic levels. It has been shown that alternate wetting and drying (AWD) water management reduces both water use and GHG emissions, but success at maintaining yields varies. This study tested the effect of early AWD (e-AWD) versus continuous flooding (CF) water management practices on grain yields, GHG emissions and grain arsenic levels in a split-plot field experiment with organic fertilisers under organic management. The treatments included: i) farmyard manure, ii) compost, and iii) biogas digestate, alone or in combination with mineral fertiliser. The e-AWD water regime showed no difference in yield for the organic treatments. Yields significantly increased by 5-16 % in the combination treatments. Root biomass and length increased in the e-AWD treatments up to 72 and 41 %, respectively. The e-AWD water regime reduced seasonal CH4 emissions by 71-85 % for organic treatments and by 51-76 % for combination treatments; this was linked to a 15-47 % reduction in dissolved organic carbon (DOC), thereby reducing methanogenesis. N2O emissions increased by 23-305 % but accounted for <20 % of global warming potential (GWP). Area and yield-scaled GWPs were reduced by 67-83 %. The e-AWD regime altered soil redox potentials, resulting in a reduction in grain arsenic and lead concentrations of up to 66 % and 73 % respectively. Grain cadmium levels were also reduced up to 33 % in organic treatments. Structural equation modelling showed that DOC, redox, ammonium and root biomass were the key traits that regulated emissions and maintained yield. Despite the fact that the experiment was conducted in the dry-season when soil moisture conditions can be relatively well-controlled, our findings should be confirmed in multi-year studies in farmers' fields. These results suggest that in flooded rice systems receiving organic amendments or organic management, the e-AWD water regime can achieve multiple environmental and food safety objectives without compromising yield.

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Rice straw incorporation affects global warming potential differently in early vs. late cropping seasons in Southeastern China

Cited by 47 publications

References 46 publications

Greenhouse gas emission from direct seeded paddy fields under different soil water potentials in Eastern India

Greenhouse gas emission from direct seeded paddy fields under different soil water potentials in Eastern India

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

Reducing greenhouse gas emissions and grain arsenic and lead levels without compromising yield in organically produced rice

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