| Response of soil N2O emission to biochar addition and water content under different salinization conditions |
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| DOI：10.7606/j.issn.1000-7601.2023.03.19 |
| Key Words: salinized soil water content biochar N2O emission |
| Author Name | Affiliation | | WANG Chun | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Tonggang | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | LUO Min | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | YAN Sihui | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | CHENG Yu | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Tibin | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | FENG Hao | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To investigate the response of soil N2O emission to biochar addition and soil water with different salinization levels, an indoor culture experiment was conducted for 30 days and five soil salinization levels (S0, S1, S2, S3 and S4) were set up. The salt content was 0%, 0.25%, 0.5%, 0.75% and 1% of soil mass, respectively. Two biochar addition modes of B0: no addition and B1: 5% of soil mass and 2 moisture conditions of W0: 60% field capacity and W1:100% field capacity were used. The results showed that soil salt had a significant effect on the cumulative emission of N2O, and the higher the salt content was, the greater the decrease was. Compared with S0 treatment, the cumulative emission of N2O in S1, S2, S3 and S4 treatments decreased by 43.9%, 66.5%, 91.9% and 93.2%, respectively. Soil moisture had a significant impact on the cumulative emission of N2O. The higher the moisture content was, the greater the cumulative emission was. Compared with W0 treatment, the cumulative emission of N2O in each salt treatment under W1 condition increased by 3.0%, 84.8%, 187.4%, 729.4% and 306.7%, respectively. The addition of biochar had an impact on the cumulative emission of N2O. Compared with B0 treatment, the increase of B1 in low water content was 3.4% to 20.6%, and that in high water content was 46.5% to 535.6%. The results showed that the higher the degree of salinization was, the lower the cumulative emissions of soil N2O became. Water had the dominant role in the emission of N2O as water had a very significant impact on the cumulative emissions of N2O. The higher the water content was, the higher the increase of cumulative emissions of N2O became. Biochar alone had no significant impact on the cumulative emissions of N2O. However, the interaction with salt had a significant effect on the cumulative emission of N2O, reducing the emission to a certain extent. |
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