Large uncertainties in GHG emissions from agricultural systems exist due to high spatial and temporal variability, measurement methods, cropping systems, management practices, and variations in soil and climatic conditions among regions (Parkin and Venterea 2010). The results were as follows: (1) Based on the results of CO2 EKC estimation, an N-shaped EKC was found; in particular, the upward trend in agricultural carbon emissions has not changed recently. Even one 6-day, midseason drainage event, temporarily reducing anaerobic soil conditions, can reduce post-drainage CH4 emissions by 64% with no evident effect on yield (Sigren etal., 1997). As with inventories, uncertainties also are great for modeling agricultural carbon fluxes related to soil processes. Johnson, J. M. F., J. S. Strock, J. E. Tallaksen, and M. Reese, 2016: Corn stover harvest changes soil hydrology and soil aggregation. The U.S. Environmental Protection Agency (EPA) reports that CH4 emissions from enteric fermentation and manure management amounted to about 232.8 teragrams (Tg) per year CO2e (functionally equivalent to 63.5 Tg C) in 2015, with an additional 17.7 Tg per year CO2e (4.8 Tg C) as N2O emitted from manure management (U.S. EPA 2018). before making use of copyrighted material. Executive Director of ABARES Dr Jared Greenville said the global community needed to find a way for agriculture to reduce emissions while also feeding the world's population. Mexicos major crops are fruits, corn, grains, vegetables, and sugarcane. A number of feed additives, such as nitrates, also can effectively decrease enteric CH4 emissions in ruminants. West, B. R. K. Runkle, H. Janzen, S. C. Reed, N. Cavallaro, Swan et al. Ugarte, C. M., H. Kwon, S. S. Andrews, and M. M. Wander, 2014: A meta-analysis of soil organic matter response to soil management practices: An approach to evaluate conservation indicators. Most of the emissions come directly from the soils after the nitrogen has been added. Rochette, P., 2008: No-till only increases N2O emissions in poorly-aerated soils. The Agricultural Model Intercomparison and Improvement Project (AgMIP)[59] was developed in 2010 to evaluate agricultural models and intercompare their ability to predict climate impacts. [9], There are many strategies that can be used to help soften the effects, and the further production of greenhouse gas emissions - this is also referred to as climate-smart agriculture. U.S. These methods include the use of drill-seeding rather than water-seeding or transplanting rice (Pittelkow et al., 2014) and carry the additional benefit of reducing the pumping requirements of irrigation water; thus, they will reduce GHG production associated with the energy use of burning fossil fuelswhether through diesel or indirectly through electricity generation. Animal husbandry is a major source of greenhouse gas emissions. Their research turns building vents into an unlikely companion to food production. [46], In 2010, agriculture, forestry and land-use change were estimated to contribute 2025% of global annual emissions. CCSP, 2007: First State of the Carbon Cycle Report (SOCCR): The North American Carbon Budget and Implications for the Global Carbon Cycle. The First State of the Carbon Cycle Report (CCSP 2007) showed total agricultural and grazing lands in North America (e.g., cropland, pasture, rangeland, shrub lands, and arid lands) accounting for 17% of global terrestrial carbon stocks. This temperature increase is expected to decrease dry matter intake of dairy cows in the region by an additional 0.9 kg per day due to heat stress (Hristov et al., 2017a). Total emissions were estimated at 1,001,352 Ggs of CO2 Equivalent. Major sources of GHG emissions in the poultry industry differ depending on the type of production. Experimental processes of acidification and biofiltration show potential for reducing CH4 emissions if practical and economical systems can be developed (Montes et al., 2013). [24] While 6% may appear to be a small contributor, per pound nitrous oxide is 300 times more powerful than carbon dioxide emissions and has a residence time of around 120 years. Livestock contributions to GHG emissions occur either directly (e.g., from enteric fermentation and manure management) or indirectly (e.g., from feed-production activities and conversion of forest into pasture or feed crops). Foley, J. In comparison, the commercial aviation industrywhose contributions to global warming are well recognized emitted around 900 million tonnes of greenhouse . Drinkwater, L. E., P. Wagoner, and M. Sarrantonio, 1998: Legume-based cropping systems have reduced carbon and nitrogen losses. The initiative was announced in the 2019 UN Climate Action Summit. Notes The conversion of farmland to other uses appears to have slowed compared with the period from 2002 to 2007, when greater than 9.6 million ha of farmland were converted to other uses (USDA-NASS 2012). Carbon can be stored long term in the soil. The remaining 28% was associated with processing, packaging, distribution, retail, and consumers (Thoma et al., 2013). For agricultural grasslands, only the effect of land-use changes on soil carbonis currently estimated. Climatic Change, doi: 10.1007/s10584-017-2023-z. Based on U.S. EPA (2018) estimates, CH4 emissions from cattle make up 25.9% of total U.S. CH4 emissions if only enteric emissions are counted, or 36.2% if emissions from manure management are included. IPCC; Geneva, Switzerland: 2019. Agricultural regional carbon budgets and net emissions are directly affected by human decision making. The effect of increased temperature on manure GHG emissions is more predictable. Agriculture, Ecosystems and Environment, 177, 10-20, doi: 10.1016/j.agee.2013.05.011. A recent analysis for the northeastern United States (Hristov et al., 2017a) estimated potential climate change effects on livestock GHG emissions. Agricultural carbon emission intensity in Jilin province during 20002018. Projected climate change likely will increase CH4 emissions from livestock manure management locations, but it will have a lesser impact on enteric CH4 emissions (high confidence). The cycling of cropland biomass into soils and the cultivation of soils influence how much of the carbon in crop biomass is respired back to the atmosphere versus remaining in the soil, ultimately determining if a cropping system is a net source or sink. This, coupled with improved input-use efficiencies may reduce GHG-emissions per unit yield (GHG intensity), with additional improvements possible through management optimization (Grassini and Cassman 2012; Pittelkow et al.,2015). A. Hungate, 2014: Faster decomposition under increased atmospheric CO2 limits soil carbon storage. Energy Econ. Although the potential for reduced GHG emissions with biofuels is compelling, some life cycle assessment analyses suggest that corn grain ethanol has marginally lower (or even greater) GHG emissions compared with those from fossil fuels (e.g., Del Grosso et al., 2014; Fargione etal., 2008). The major agricultural non-CO2 emission sources were nitrous oxide (N2O) from cropped and grazed soils and enteric methane (CH4) from livestock (very high confidence, very likely). Geoderma, 292, 59-86, doi: 10.1016/j.geoderma.2017.01.002. (2005) demonstrated that no-tillage agriculture on clay-rich soil built SOC, whereas others (Baker and Griffis 2005; Chi et al., 2016; Verma et al., 2005) used gas exchange techniques to suggest conservation or no-tillage systems were near carbon neutral. These two sources are affected by different factors and carry different levels of uncertainties. [M. A. Liebig, A. J. Franzluebbers, and R. F. Follett (eds.)]. [R. F. Follett (ed.)]. Epub 2018 Jun 26. Thornton, P. E., J.-F. Lamarque, N. A. Rosenbloom, and N.M. Mahowald, 2007: Influence of carbon-nitrogen cycle coupling on land model response to CO2 fertilization and climate variability. -. A 6% increase from 2020 pushed emissions to 36.3 gigatonnes (Gt), an estimate based on the IEA's detailed region-by-region and fuel-by-fuel analysis, drawing on the latest official national data and publicly available energy, economic and weather data. Top-down approaches, based on measurements of changes in GHG concentrations over large areas and inferences about the sources of those changes, yield different estimates for CH4 emissions. Global Fossil CO2 emissions by Year Sources Proceedings of the National Academy of Sciences USA, 108(33), 13864-13869, doi: 10.1073/pnas.1017277108. Mitigation strategies must be considered from a whole-farm perspective to ensure a net environmental benefit (Montes et al., 2013). Carbon dioxide is absorbed by trees, pasture and crops through photosynthesis and converted to other complex carbon compounds and oxygen. A review of manure management mitigation options. Most of this carbon pool existed within soils; less than 5% resided in cropland vegetation. The organization provided residents with resources to plant new, more adaptable crops to alongside their typical maize to protect the corn from variable temperatures, frost, etc. HHS Vulnerability Disclosure, Help Agriculture, Ecosystems and Environment, 121(1-2), 47-58, doi: 10.1016/j.agee.2006.12.004. Agricultural non-CO2 emissions were primarily N2O from cropped and grazed soils and CH4 from enteric fermentation in livestock. As an example, the estimated CH4 emission intensity for the U.S. dairy herd has decreased from 31 g per kg milk in 1924 to 14 g per kg in 2015 (Global Research Alliance on Agricultural Greenhouse Gases 2015). Note: I, II, III, IV, V, and VI represent, Agricultural carbon emission intensity in. U.S. Environmental Protection Agency. Bernacchi, C. J., S. E. Hollinger, and T. Meyers, 2005: The conversion of the corn/soybean ecosystem to no-till agriculture may result in a carbon sink. Other perennial crops (i.e., crops growing and harvested over multiple years) of regional importance include tree crops (mostly fruit and nuts) and vineyards. 9 March 2021 Climate and Environment. The effect on enteric emissions is through increased or decreased feed (i.e., dry matter) intake; projected increased ambient temperatures can decrease dry matter intake and thus proportionally reduce enteric CH4 emissions. Decoupling distribution of agriculture. Both fertilizer and pesticide consumption are associated with higher levels of CO2 emissions. Most methane emissions are caused by human activityabout 60 percent, as much as a third of which comes from agriculture. Sainju, U. M., B. P. Singh, W. F. Whitehead, and S. Wang, 2006: Carbon supply and storage in tilled and nontilled soils as influenced by cover crops and nitrogen fertilization. [URL]. Increased cattle productivity has resulted in increased feed efficiency and decreased enteric CH4 emission intensity (i.e., CH4 emitted per unit of milk or meat). Ecological Applications, 11(2), 343-355, doi: 10.1890/1051-0761(2001)011[0343:gmacig]2.0.co;2. Doetterl, S., A. [(accessed on 20 May 2021)];2020 Available online. Following application of the manure spread onto the soil in a thin layer, aerobic conditions suppress further CH4 production. Uncertainty exists in any measurement or projection of GHG emissions. Innovative agricultural practices and technologies can play a role in climate change mitigation[54] and adaptation. Whereas emissions from enteric fermentation are relatively well studied and predictable, there is larger uncertainty regarding manure CH4 emissions and net effects of different intensities and types of grazing (see also Ch. Food and Agriculture Organization of the United Nations. Soil Science Society of America Journal, 55(6), 1668, doi: 10.2136/sssaj1991.03615995005500060028x. Pittelkow, C. M., M. A. Adviento-Borbe, J. E. Hill, J. The food supply chain is on course to overtake farming and land use as the largest contributor to greenhouse gases from the agri-food sector. USDA, 2017a: USDA Agricultural Projections to 2026. 177. Agricultural Land. Future shifts in management can reverse gains. 10: Grasslands). In this context, it is necessary for China to study the nexus of agricultural economic growth and carbon emissions. We look at this in detail here. a The percentage of no-tilled land does not imply that these lands are managed in a long-term, no-till system. Such influences can have both negative and positive effects on the carbon cycle in direct and indirect ways (see Box. By addressing food loss and waste greenhouse gas emission mitigation is also addressed. Improved animal health, reduced mortality and morbidity, and improved reproductive performance also can increase herd productivity and reduce GHG emission intensity in livestock production (Hristov et al., 2013a). Annual crop cultivation and crop burning often is considered carbon neutral (IPCC 2006; U.S. EPA 2018) because biomass is harvested and regrown annually. Methane mitigation practices for livestock include practices related to reducing emissions from enteric fermentation (i.e., cattle) and manure management (i.e., cattle and swine) as discussed by Hristov etal. Global Change Biology, 17(10), 3089-3101, doi: 10.1111/j.1365-2486.2011.02458.x. 7: Tribal Lands). Because of this vast spatial extent and the strong role that land management plays in how agricultural ecosystems function, agricultural lands and activities represent a large portion of the North American carbon budget. It uses the same methods and emission factors as the MfE 2022 Measuring Emissions Guidance. We also found that the change in agricultural carbon emissions was affected more by economic policy than by environmental policy. c USDA-NASS (2012). Agriculture, Ecosystems and Environment, 118(1-4), 1-5, doi: 10.1016/j.agee.2006.05.014. Elsevier, pp. Science is now demonstrating that agriculture can be a primary solution to the problem of greenhouse gas emissions and climate change. (2014) proposed that livestock CH4 emissions may be in the range of 12 to 17 Tg per year, which is roughly 30% and 85% greater than EPAs estimate for 2012 (U.S. EPA 2016). The food system as a whole - including refrigeration, food processing, packaging, and transport - accounts for around one-quarter of greenhouse gas emissions. (2007) suggested that the balance between competing pressures would result in greater crop yields in temperate regions compared with those in semiarid and tropical regions. [URL]. The U.S. EPA estimated 95% confidence interval lower and upper uncertainty bounds for agricultural GHG emissions at 11% and +18% (CH4 emissions from enteric fermentation) and 18% and +20% and 16% and +24% (CH4 and N2O emissions from manure management, respectively; U.S. EPA 2018). Although biomass itself is technically carbon neutral, this assumption does not necessarily account for changes in soil carbon that may be associated with production practices, which affect the carbon cycle and net emissions. 2019;81:393407. Ying Yong Sheng Tai Xue Bao. Finally, there is considerable uncertainty in soil carbon accumulation and emissions from soils under different conditions and management practices, all of which are complicated by uncertainties about the total amount of land area under different management practices (see Ch.12: Soils for more information on soil carbon balance). Based on this, the per capita CO2-equivalent emissions . b From U.S. EPA (2018); 2015 emissions data. For example, increasing animal productivity through genetic selection for feed efficiency can be an effective strategy for reducing CH4 emission intensity. [45], In 2019 the IPCC reported that 13%-21% of anthropogenic greenhouse gasses came specifically from the Agriculture, Forestry, and Other Land Uses Sector (AFOLU). [URL], FAOSTAT, 2017: Food and Agriculture Data. (2010) and Ugarte et al. Dairy production systems, however, are considerably more efficient than beef systems. Before B. McBratney, V. d. R. d. Courcelles, K. Singh, I. Wheeler, L. Abbott, D. A. Angers, J. Baldock, M. Bird, P. C. Brookes, C. Chenu, J. D. Jastrow, R. Lal, J. Lehmann, A. G. ODonnell, W. J. Parton, D. Whitehead, and M. Zimmermann, 2013: The knowns, known unknowns and unknowns of sequestration of soil organic carbon. Global Change Biology, 11, 1867-1872, doi: 10.1111/j.1365-2486.2005.01050.x. (2014) suggest that other factors contributing to variability in soil organic carbon sequestration include climatic and soil properties interacting with management factors (e.g., cropping frequency, crop rotation diversity, nitrogen, and drainage), along with impacts on rooting depth and above- and belowground biomass. Lehman, R. M., W. I. Taheri, S. L. Osborne, J. S. Buyer, and D. D. Douds, 2012: Fall cover cropping can increase arbuscular mycorrhizae in soils supporting intensive agricultural production. Franzluebbers, A. J., J. Agriculture and Agri-Food Canada, 2016: Per Capita Disappearance: Protein Disappearance of Animal Protein Sources in Canada. A. Osborne, 2003: Soil microbial communities under conventional-till and no-till continuous cotton systems. But they can also arise from indirect pathways. Plant material maintained on the soil surface improves soil physical properties (e.g., Johnson et al., 2016), nutrient availability, and microbial biomass and activity (Feng et al., 2003; Weyers et al., 2013). Soil Biology and Biochemistry, 35(12), 1693-1703, doi: 10.1016/j.soilbio.2003.08.016. Livestock such as cattle, sheep and deer produce methane, as shown in the diagram below. Conversely, management practices with the potential to release stored carbon are the inadequate return of crop residues (Blanco-Canqui and Lal 2009) and aggressive tillage (Conant et al., 2007). [8] Farm animal digestive systems can be put into two categories: monogastric and ruminant. (2009). According to research published in Nature Food, 35% of all global greenhouse gas emissions are attributable to food production, "of which 57% corresponds to the production of animal-based food," including livestock feed. Emissions from certain dairy manure systems (e.g., flush systems with settling ponds and anaerobic lagoons) can be higher than estimates used by current inventories. Combined, these emissions represented 3.8% of total U.S. GHG emissions. Soil Science Society of America Journal, 61(1), 124, doi: 10.2136/sssaj1997.03615995006100010019x. Decoupling and Decomposition Analysis of Agricultural Carbon Emissions: Evidence from Heilongjiang Province, China. ), a Guatemalan program funded by the United States government until 2017, focus on agroforestry and weather monitoring systems to help farmers adapt. Agronomy Journal, 96(6), 1523, doi: 10.2134/agronj2004.1523. Natural and seeded pastures available for grazing in Canada make up about 20 million ha (Legesse et al., 2016). Agriculture contributes to greenhouse gas increases through land use in four main ways: Together, these agricultural processes comprise 54% of methane emissions, roughly 80% of nitrous oxide emissions, and virtually all carbon dioxide emissions tied to land use.[27]. Technical Bulletin. Benefits and costs of climate change mitigation technologies in paddy rice: Focus on Bangladesh and Vietnam. Thus, quantifying GHG mitigation by management also must account for changes in N2O and CH4, which can occur coincidently with changes in soil carbon storage (VandenBygaart 2016). High-yield maize with large net energy yield and small global warming intensity. c Source: FAOSTAT (2017); average data for 19902014. Global Change Biology, 21(1), 407-417, doi: 10.1111/gcb.12701. Abstract Modern agriculture contributes significantly to greenhouse gas emissions, and agriculture has become the second biggest source of carbon emissions in China. Houghton, R. A., J. E. Hobbie, J. M. Melillo, B. Moore, B. J. Peterson, G. R. Shaver, and G. M. Woodwell, 1983: Changes in the carbon content of terrestrial biota and soils between 1860 and 1980: A net release of CO2 to the atmosphere. Blanco-Canqui, H., 2013: Crop residue removal for bioenergy reduces soil carbon pools: How can we offset carbon losses? Wang, W., R. C. Dalal, S. H. Reeves, K. Butterbach-Bahl, and R. Kiese, 2011: Greenhouse gas fluxes from an Australian subtropical cropland under long-term contrasting management regimes. There is more uncertainty in predicting CH4 emissions from manure, partially because these emissions depend heavily on the particular manure handling system and temperature. Land clearing can destroy the soil carbon sponge. D. Manter, J 153, doi: 10.2307/1942531 dieleman, W. I., S., Growth and changes in soil carbon can take as part of making our Environment in Aotearoa.. 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