Inhibitory Effects of Biochar on N 2 O Emissions through Soil Denitrification in Huanghuaihai Plain of China and Estimation of Influence Time

Hongyuan Liu, Nana Wang, Yanjun Wang, Ying Li, Yan Zhang, Gaoxiang Qi, Hongyun Dong, Hongcheng Wang, Xijin Zhang and Xinhua Li ()
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Hongyuan Liu: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Nana Wang: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Yanjun Wang: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Ying Li: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Yan Zhang: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Gaoxiang Qi: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Hongyun Dong: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Hongcheng Wang: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Xijin Zhang: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China
Xinhua Li: National Key Laboratory of Efficient Utilization of Nutrient Resources, Shandong Academy of Agricultural Sciences, Jinan 250100, China

Sustainability, 2024, vol. 16, issue 13, 1-17

Abstract: Biochar application is considered an effective method for reducing nitrous oxide (N 2 O) emissions from soil. However, the mechanisms underlying the influence of various biochar dosages on soil N 2 O emissions and the duration of one-time biochar application remain unclear. The effects of different biochar application rates and a one-time application on soil N 2 O emissions in the Huanghuaihai Plain of China were investigated through a field experiment from 2020 to 2022. In the wheat and maize rotation system, six treatments were administered: no biochar (C0); 2 (C1), 4 (C2), 8 (C3), and 12 t/hm 2 biochar (C4) applied annually; and a one-time application of 12 t/hm 2 biochar (CS) in 2018. Our results indicate that, compared with C0, biochar significantly inhibited soil N 2 O emissions, particularly in the C3 and C4 treatments, with reductions of 31.36–56.21% and 36.92–52.45%, respectively. However, CS did not significantly affect soil N 2 O emissions during the study period. These findings suggest that the biochar’s inhibitory effect on soil N 2 O emissions is contingent upon the dosage and frequency of application. A structural equation model revealed that biochar decreases soil N 2 O emissions by enhancing the reduction in N 2 O during denitrification. Under the conditions of this experiment, based on a logistic ecological model, a one-time application of 12 t/hm 2 biochar was projected to significantly reduce soil N 2 O emissions for approximately 1.77 years. On the whole, biochar reduces soil N 2 O emissions mainly by regulating N 2 O production through denitrification, and the duration of this inhibition of N 2 O emissions mainly depends on the application amount and frequency of biochar application.

Keywords: one-time application; functional gene; denitrification; different application amounts; biochar; N 2 O emissions (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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