ACTA AGRICULTURAE BOREALI-SINICA ›› 2021, Vol. 36 ›› Issue (S1): 260-266. doi: 10.7668/hbnxb.20192020

Special Issue: Rice Soil fertilizer

• Resources & Environment·Plant Protection • Previous Articles     Next Articles

Effects of Straw Returning on N2O Emission under Tropical Soil-rice Planting System

ZHANG Peng1,2, WU Peicong2,3, SHAN Ying2, ZOU Ganghua2, DING Zheli4, QIAN Yongde1, ZHAO Fengliang2   

  1. 1. College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China;
    2. Institute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China;
    3. College of Tropical Crops, Hainan University, Haikou 570228, China;
    4. Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
  • Received:2021-07-10 Published:2021-12-28

Abstract: In order to study the effects of straw returning on N2O emission from paddy fields in tropical areas, this study was based on paddy soil cultivated for 4 years under different management measures, and observed the dynamic changes of N2O emission after rice planting through pot experiment. The experiment set up N free control(CK), conventional N application(CT), only straw application(ST)and conventional N application combined with straw(CTST)treatment. The results showed that N2O fluxes ranged from-0.23 to 6.64 mg/(m2·h), mainly concentrated in the early and middle stages of rice growth. Compared with CT treatment, CTST treatment, significantly reduced inorganic N concentration in surface water at tillering stages(P<0.05), and reduced the maintenance time of N2O emission peak. The whole growth period N2O cumulative emission of each treatment ranged from 0.13 to 2.85 g/m2, and the N application treatment was significantly higher than the N free treatment(P<0.05), and there was no significant difference between the ST and CK treatment(P>0.05). Compared with the CT treatment, the CTST treatment could significantly reduce the N2O emission by 49.11%(P<0.05). Therefore, application of nitrogen fertilizer is the main reason for the increase of N2O emission, and straw returning can significantly reduce N2O emission in tropical soil-rice system.

Key words: Straw returning, N2O emission, Tropical regions, Rice planting system, Surface water

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Cite this article

ZHANG Peng, WU Peicong, SHAN Ying, ZOU Ganghua, DING Zheli, QIAN Yongde, ZHAO Fengliang. Effects of Straw Returning on N2O Emission under Tropical Soil-rice Planting System[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(S1): 260-266. doi: 10.7668/hbnxb.20192020.

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