Greenhouse gas emissions vary in response to different biochar amendments: an assessment based on two consecutive rice growth cycles
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The efficiency of biochar to mitigate greenhouse gas (GHG) emission from rice paddy soils is not consistent. Furthermore, which factor dominates this mitigation efficiency is not clear. In the present 2-year greenhouse experiment, the effects of biochars derived from two feedstocks (wheat straw and saw dust) and two pyrolysis temperatures (500 °C and 700 °C), and applied at two different rates (0.5 wt% and 3 wt%) on methane (CH4) and nitrous oxide (N2O) emissions, and the total global warming potential (GWPt), and GHG intensity (GHGI) were measured. The results showed that biochar applications did not alter GHG emission flux patterns in either rice cycle. In 2015, the N2O emissions were 24.6–71.2% lower under six biochar treatments than under the urea control treatment. Moreover, total CH4 emissions were mitigated by 13.3–92.6% and 27.7–53.5% under six and five biochar treatments in 2015 and 2016, respectively. Overall, lower GWPt and GHGI were observed under most of the biochar treatments compared with the urea control treatment in both rice cycles. The multivariate analysis of variance (MANOVA) results of the data from both years suggested that the biochar effects on reducing GHG emissions changed with either individual factors or their interactive effects. The responses of the GWPt and GHGI varied mainly with biochar application rate and pyrolysis temperature (P < 0.005); compared with that derived from a relatively low pyrolysis temperature and applied at a relatively low rate, biochar derived from a relatively high pyrolysis temperature and applied at a relatively high rate exerted relatively higher GWPt and GHGI mitigation efficiencies. The influence of the feedstock source was not as prominent as the application rate and pyrolysis temperature, which will expand the scope of biochar applications.
KeywordsBiochar Nitrous oxide Methane GWP GHGI Paddy soil
The contribution of Ms. Wang YM to relevant experiments is highly appreciated.
The authors are grateful for the financial support of the National Natural Science Foundation of China (31601832, 41877090, and 41601320) and the Natural Science Foundation of Jiangsu Province (BK20160931, BK20160594).
- IPCC (Intergovernmental Panel on Climate Change) (2007) Climate change: changes in atmospheric constituents and in radiative forcing. In: Forster P, Ramaswamy V, Artaxo P, Berntsen T, Betts R, Fahey DW, Haywood J, Lean J, Lowe DC, Myhre G, Nganga J, Prinn R, Raga G, Schulz M, Dorland RV, Solomon S, Qin D, Manning M, Chen Z, Marquis M, Averyt KB, Tignor M, Miller HL (eds) The physical science basis. Cambridge University Press, CambridgeGoogle Scholar
- Li B, Fan C, Zhang H, Chen Z, Sun L, Xiong Z (2015) Combined effects of nitrogen fertilization and biochar on the net global warming potential, greenhouse gas intensity and net ecosystem economic budget in intensive vegetable agriculture in southeastern China. Atmos Environ 100:10–19CrossRefGoogle Scholar
- Lu K, Yang X, Gielen G, Bolan N, Ok YS, Niazi NK, Xu S, Yuan G, Chen X, Zhang X, Liu D, Song Z, Liu X, Wang H (2017) Effect of bamboo and rice straw biochars on the mobility and redistribution of heavy metals (cd, cu, Pb and Zn) in contaminated soil. J Environ Manag 186:285–292CrossRefGoogle Scholar
- Niazi NK, Bibi I, Shahid M, Ok YS, Shaheen SM, Rinklebe J, Wang H, Murtaza B, Islam E, Nawaz MF, Luttge A (2018) Arsenic removal by Japanese oak wood biochar in aqueous solutions and well water: investigating arsenic fate using integrated spectroscopic and microscopic techniques. Sci Total Environ 621:1642–1651CrossRefGoogle Scholar
- Spokas KA, Reicosky DC (2009) Impacts of sixteen different biochars on soil greenhouse gas production. Ann Environ Sci 3:179–193Google Scholar
- Wu W, Li J, Lan T, Müller K, Niazi NK, Chen X, Xu S, Zheng L, Chu Y, Li J, Yuan G, Wang H (2017) Unraveling sorption of lead in aqueous solutions by chemically modified biochar derived from coconut fiber: a microscopic and spectroscopic investigation. Sci Total Environ 576:766–774CrossRefGoogle Scholar
- Zhao X, Min J, Wang S, Shi W, Xing G (2011) Further understanding of nitrous oxide emission from paddy fields under rice/wheat rotation in South China. J Geophys Res 116:G02016Google Scholar