Effects of Coconut Chaff Biochar Amendment on Methane and Nitrous Oxide Emissions from Paddy Fields in Hot Areas

被引：5

作者：

Wang Z.-J. ^{[1
]}

Wang H.-H. ^{[1
]}

Li J.-Q. ^{[1
]}

Wu Y.-Z. ^{[1
]}

Fu P.-J. ^{[1
]}

Meng L. ^{[1
]}

Tang S.-R. ^{[1
]}

机构：

[1] College of Tropical Crops, Hainan University, Haikou

来源：

Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 08期

关键词：

Biochar; Coconut chaff; Double-cropping rice fields; Global warming potential (GWP); Greenhouse gas; Hot area;

D O I：

10.13227/j.hjkx.202011247

中图分类号：

学科分类号：

摘要：

Based on the rice-vegetable crop rotation model, in-situ measurements of nitrous oxide (N2O) and methane (CH4) emissions were conducted in double-cropping rice fields in Hainan to determine the impact of coconut chaff biochar on greenhouse gas emissions. The experiment involved four treatments: conventional farming fertilization (CON), nitrogen fertilizer combined with 20 t•hm-2 biochar (B1), nitrogen fertilizer combined with 40 t•hm-2 biochar (B2), and no nitrogen fertilizer, as the control (CK). The N2O and CH4 emissions were measured using static chamber-gas chromatography during the two paddy seasons, and the global warming potential (GWP) and greenhouse gas intensity (GHGI) were also estimated. The results show that N2O emission dynamics during the early rice season are closely related to the mineral nitrogen content of the soil. The N2O is emitted at the rice seedling and tillering stages after fertilization. The cumulative N2O emission during the early rice season was 0.18- 0.76 kg•hm-2. Compared with the CON treatment, the biochar treatments reduced N2O by 18%- 43%, and the B2 treatment resulted in a significant reduction. The addition of biochar may promote the reduction of N2O at the early rice seedling stage and increase N2O emissions by improving the soil NO3--N content at the early rice tillering stage. During the late rice season, N2O is emitted during the heading and maturity stages, and the cumulative N2O emission was 0.17- 0.34 kg•hm-2. The B1 treatment reduced emissions by 37%, and B2 increased emission by only 3%, which is not a significant difference. The peak of CH4 emissions from rice fields appeared in the late phase of the early rice season and prophase of the late rice season. The cumulative emission of CH4 in the early rice season was 3.11- 14.87 kg•hm-2. Compared with CON, the CK treatment increased emission by 39%. The biochar treatment may increase soil aeration and limit the ability of CH4 production in the early rice season, as B1 and B2 treatments reduced CH4 emissions by 28% and 71%. The cumulative CH4 emission in late rice season was 53.1- 146.3 kg•hm-2, and the emission dynamics were significantly positively correlated with NH4+-N content. CK and B1 treatments increased CH4 emissions by 52% and 99%, respectively compared with CON, and the B2 treatment significantly increased CH4 emissions by 176%. Compared with CON, the B1 and B2 treatments increased the yield by 12.0% and 14.3% when applied in the early rice season and by 7.6% and 0.4% when applied in the late rice season, respectively. Due to the increased methane emissions in the late rice season, biochar amendment increased the GWP of the double-cropping rice field, in which the high amount of biochar reached a significant level; different amounts of biochar had no significant effect on the GHGI of the double-cropping rice field. Thus, the application of coconut chaff biochar for the reduction of greenhouse gas emission, from rice fields in hot areas, requires further research. © 2021, Science Press. All right reserved.

引用

页码：3931 / 3942

页数：11

共 74 条

[31] Jiang Y, Liao P, Van Gestel N, Et al., Lime application lowers the global warming potential of a double rice cropping system, Geoderma, 325, pp. 1-8, (2018)
[32] He T T, Liu T, Yun F, Et al., Research on the effect mechanism of biochar on farmland N2O emissions, Journal of Agricultural Science and Technolog, 35, 5, pp. 124-131, (2021)
[33] Van Zwieten L, Singh B, Joseph S, Et al., greenhouse gases from soil, pp. 227-249, (2009)
[34] Wang J Y, Pan X J, Liu Y L, Et al., Effects of biochar amendment in two soils on greenhouse gas emissions and crop production, Plant and Soil, 360, 1- 2, pp. 287-298, (2012)
[35] Yanai Y, Toyota K, Okazaki M., Effects of charcoal addition on N2O emissions from soil resulting from rewetting air-dried soil in short-term laboratory experiments, Soil Science and Plant Nutrition, 53, 2, pp. 181-188, (2007)
[36] Samad M S, Biswas A, Bakken L R, Et al., Phylogenetic and functional potential links pH and N2O emissions in pasture soils, Scientific Reports, 6, (2016)
[37] Lu H H, Wang Y F, Liu Y X, Et al., Effects of water-washed biochar on soil properties, greenhouse gas emissions, and rice yield[J], CLEAN-Soil, Air, Water, 46, 4, (2018)
[38] Shen J L, Tang H, Liu J Y, Et al., Contrasting effects of straw and straw-derived biochar amendments on greenhouse gas emissions within double rice cropping systems, Agriculture, Ecosystems & Environment, 188, pp. 264-274, (2014)
[39] Spokas K A, Reicosky D C., Impacts of sixteen different biochars on soil greenhouse gas production, Annals of Environmental Science, 3, pp. 179-193, (2009)
[40] Mathieu O, Leveque J, Henault C, Et al., Emissions and spatial variability of N2O, N2 and nitrous oxide mole fraction at the field scale, revealed with 15N isotopic techniques, Soil Biology and Biochemistry, 38, 5, pp. 941-951, (2006)

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