Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (10): 3042-3048.DOI: 10.3969/j.issn.1000-2561.2021.10.039

• Agricultural Ecology & Environmental Protection • Previous Articles    

Effects of Co-application of Biochar and Nitrification Inhibitor on Soil Nitrification and N2O Emissions in Tropical Vegetable Soil

ZHU Yunfei1,4, ZHANG Qi1,5, HUANG Yilun1,5, LENG Youfeng1,4, CHEN Miao1,2,3,5, FAN Changhua1,2,3,*(), LI Qinfen1,2,3,*()   

  1. 1. Institute of Environment and Plant Protection, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
    2. Danzhou Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture and Rural Affairs, Danzhou, Hainan 571737, China
    3. Hainan Key Laboratory of Tropical Eco-Circular Agriculture, Haikou, Hainan 571101, China
    4. College of Eco-environment Engineering, Guizhou Nationality University, Guiyang, Guizhou 550025, China
    5. College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China
  • Received:2020-11-19 Revised:2021-02-24 Online:2021-10-25 Published:2021-11-25
  • Contact: FAN Changhua,LI Qinfen

Abstract:

To evaluate the effects of co-application of biochar and nitrification inhibitor on regulating soil nitrification and mitigating N2O emission, an incubation experiment was conducted to explore the dynamic variations of inorganic N concentration and the associated intensity and N2O emissions in tropical vegetable soil. Four treatments were established as N fertilizer alone (N), N fertilizer applied with biochar (N+Bc), N fertilizer applied with nitrification inhibitor (N+Ni), and N fertilizer applied with biochar and nitrification inhibitor (N+Bc+Ni). Results showed that biochar amendment accelerated the conversion of NH4+-N to NO3--N, while nitrification inhibitor significantly decreased this process, and the co-application of the both weakened the nitrification to some extent. Moreover, biochar amendment elevated the NO3--N intensity by 15.8%, while nitrification inhibitor amendment promoted NH4+-N intensity by 33.4%, and the significant interaction occurred between biochar and nitrification inhibitor on NH4+-N and NO3--N intensity. In addition, NO2--N intensity was decreased by biochar or nitrification inhibitor amendment, with the latter having more obvious effects. Furthermore, biochar and nitrification inhibitor amendment alone decreased N2O emission by 15.1%-68.3%, and further decline in N2O emission occurred in the co-application of the both. Therefore, the co-application of biochar and nitrification inhibitor would be a promising strategy for simultaneously sequencing carbon and mitigating N2O emission in tropical vegetable soil.

Key words: Biochar, nitrification inhibitor, nitrification, nitrous oxide (N2O), vegetable soil

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