Irrigation and Greenhouse Gas Emissions: A Review of Field-Based Studies

Soil Systems, Год журнала: 2020, Номер 4(2), С. 20 - 20

Опубликована: Апрель 13, 2020

Irrigation practices can greatly influence greenhouse gas (GHG) emissions because of their control on soil microbial activity and substrate supply. However, the effects different irrigation management practices, such as flood irrigations versus reduced volume methods, including drip sprinkler irrigation, GHG are still poorly understood. Therefore, this review was performed to investigate strategies emission nitrous oxide (N2O), carbon dioxide (CO2), methane (CH4) by synthesizing existing research that either directly or indirectly examined at least two rates within a single field-based study. Out thirty-two articles selected for review, found be effective in lowering rate CH4 emissions, while had highest emission. The CO2 increased mostly under low effect N2O were inconsistent, though majority studies reported continuously flooded field treatments. global warming potential (GWP) demonstrated water-saving have decrease emissions. In general, GWP higher flooded. major finding from is optimizing may help reduce net GWP. more assessing varying GHGs agricultural warranted.

Язык: Английский

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Does the use of digestate to replace mineral fertilizers have less emissions of N2O and NH3?

Agricultural and Forest Meteorology, Год журнала: 2019, Номер 269-270, С. 112 - 118

Опубликована: Фев. 14, 2019

Язык: Английский

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Historical nitrogen fertilizer use in China from 1952 to 2018

Earth system science data, Год журнала: 2022, Номер 14(11), С. 5179 - 5194

Опубликована: Ноя. 23, 2022

Abstract. China ranks in the highest position for nitrogen (N) fertilizer consumption world. Although N use has greatly contributed to China's food production, this also caused an unprecedented alteration biogeochemical cycles and endangered terrestrial aquatic ecosystems. Existing of fertilizers China, as shown by digital maps, is usually coarse resolution intermittently covered with a biased gridded dataset. Here, we have reconstructed historical, annual dataset resampled it 5 km×5 km resolution, covering period from 1952 2018 integrating improved cropland maps. Results showed that most input was directly applied N-only fertilizer, while contribution compound ranged between 16 % 24 since 1980. The national total increased 0.06 Tg yr−1 (0.05 g m−2 yr−1) 31.15 (18.83 2014 then decreased 28.31 (17.06 2018. Despite decreasing 9.1 (2.84 2018, 6 (0.43 during corresponding period. previous Food Agriculture Organization (FAO) data-based products overestimated low coverage areas but underestimated high areas. However, our newly data not only corrected existing biases spatial distribution vegetable other crops (e.g., orchards), grain crops, are intensively fertilized implying importance quantifying greenhouse gas (GHG) emissions these croplands. We argue reconstructed, spatially explicit study expected contribute better understanding cycles, including simulations GHG production China. crop-specific datasets available via open repository (https://doi.org/10.6084/m9.figshare.21371469.v1; Yu, 2022).

Язык: Английский

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Potential of Biochar to Reduce Greenhouse Gas Emissions and Increase Nitrogen Use Efficiency in Boreal Arable Soils in the Long-Term

Frontiers in Environmental Science, Год журнала: 2022, Номер 10

Опубликована: Май 17, 2022

Biochars have potential to provide agricultural and environmental benefits such as increasing soil carbon sequestration, crop yield, fertility while reducing greenhouse gas (GHG) emissions nitrogen leaching. However, whether these effects will sustain for the long-term is still unknown. Moreover, were observed mostly in highly weathered (sub-) tropical soils with low pH organic (SOC). The northern colder boreal regions typically higher SOC undergo continuous freeze-thaw cycles. Therefore, of biochars may be different from those other climates. only a few biochar studies been conducted regions. We aimed assess on GHG emissions, yield-normalized non-CO 2 (GHGI), N dynamics soils. For this, we collected data four existing Finnish field experiments during 2018 growing season. Jokioinen (Stagnosol), Qvidja (Cambisol), Viikki-1 Viikki-2 (Umbrisol), where applied, 2, 8, 7 years before, respectively. mineral N, microbial biomass measured all fields, whereas, additional measurements plant contents leaching Qvidja. increased CO efflux Viikki-2, there no statistically significant fluxes O or CH 4 , but Qvidja, tended reduce at peak emission points. tendency seemed silt content lower initial carbon. demonstrated yield by 65% reduced GHGI 43% Viikki-2. In increment biomass, uptake, use efficiency, reduction NO 3 − –N spruce attributed its ability retain –N, which could linked significantly specific surface area. hence losses, has implications sustainable management fertilization.

Язык: Английский

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How does soil water status influence the fate of soil organic matter? A review of processes across scales

Earth-Science Reviews, Год журнала: 2022, Номер 234, С. 104214 - 104214

Опубликована: Окт. 13, 2022

Язык: Английский

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