Effects of reduced chemical fertilizer combined with straw retention on greenhouse gas budget and crop production in double rice fields
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A two-year field investigation was conducted in a typical double rice region in South China. The treatments included conventional dose of nitrogen, phosphorus, and potassium fertilizers (NPKc); reduced chemical fertilizer combined with straw retention (NPKr+S); and no fertilizer as a control (CK). The global warming potential (GWP) was evaluated with nitrous oxide (N2O) and methane (CH4) emissions. The results showed that fertilization enhanced not only CH4 but also N2O emissions. For CK, NPKc, and NPKr+S, respectively, annual N2O emissions were 0.09, 0.47, and 0.33 kg ha−1; and annual CH4 emissions were 562.4, 657.9, and 882.2 kg ha−1. Consequently, the GWPs were 19,146, 22,507, and 30,094 kg CO2-eqv ha−1 year−1 for CK, NPKc, and NPKr+S, respectively. As rice grain yields were comparable between NPKc (9332 kg ha−1 year−1) and NPKr+S (9261 kg ha−1 year−1), the greenhouse gas intensity (GHGI) was significantly lower in NPKc compared with that in NPKr+S which induced more GWP. Overall, this study showed the potential of straw retention to reduce chemical fertilizer use. But it increased the GWP by 33.7% and GHGI by 34.7% in double rice systems under continuous flooding regime.
KeywordsFertilization Straw incorporation Methane Nitrous oxide Global warming potential Greenhouse gas intensity
This work was supported by the National Natural Science Foundation of China (grant numbers 41503081 and 41401292), the National Key Research and Development Plan (grant number 2016YFD0201205-4), and the Natural Science Foundation of Hunan Province, China (grant number 2018JJ3878).
- FAOSTAT (2017a) Available on http://www.fao.org/faostat/en/#data/QC. Accessed 15 Jan 2018
- FAOSTAT (2017b) Available on http://www.fao.org/faostat/en/#data/RF. Accessed 15 Jan 2018
- Kritee K, Nair D, Zavala-Araiza D, Proville J, Rudek J, Adhya TK, Terrance Loecke T, Esteves T, Balireddygari S, Dava O, Ram K, Abhilash SR, Madasamy M, Dokka RV, Anandaraj D, Athiyaman D, Reddy M, Ahuja R, Hamburg SP (2018) High nitrous oxide fluxes from rice indicate the need to manage water for both long-and short-term climate impacts. Proc Natl Acad Sci USA 115:9720–9725CrossRefGoogle Scholar
- Myhre G, Shindell D, Bréon F-M, Collins W, Fuglestvedt J, Huang J, Koch D, Lamarque J-F, Lee D, Mendoza B, Nakajima T, Robock A, Stephens G, Takemura T, Zhang H (2013) Anthropogenic and natural radiative forcing. In: Stocker TF, Qin D, Plattner GK, Tignor M, Allen SK, Boschung J, Nauels A, Xia Y, Bex V, Midgley PM (eds) Climate change 2013: the physical science basis, Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, pp 659–740Google Scholar
- Silgram M, Chambers BJ (2002) Effects of long-term straw management and fertilizer nitrogen additions on soil nitrogen supply and crop yields at two sites in eastern England. J Agric Sci Cambrige 139:115–127Google Scholar
- Zou J, Huang Y, Jiang J, Zheng X, Sass RL (2005) A 3-year field measurement of methane and nitrous oxide emissions from rice paddies in China: effects of water regime, crop residue, and fertilizer application. Glob Biogeochem Cycles 19. https://doi.org/10.1029/2004GB002401