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| Effects of three fungicides on soil N2O emissions in Hainan winter vegetable fields |
| Received:January 07, 2025 |
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| KeyWord:fungicides;soils;vegetable field;nitrogen cycling;N2O emissions |
| Author Name | Affiliation | E-mail | | LIU Xinrui | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | QIN Xiaofeng | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | ZHAO Hua | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | LIU Chaoqi | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | ZHANG Yanxia | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | ZHU Qilin | School of Breeding and Multiplication, Hainan University, Sanya 572025, China | | | DAN Xiaoqian | School of Breeding and Multiplication, Hainan University, Sanya 572025, China | | | TANG Shuirong | School of Breeding and Multiplication, Hainan University, Sanya 572025, China | | | ZHANG Jinbo | School of Breeding and Multiplication, Hainan University, Sanya 572025, China | | | WU Yanzheng | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | wyz198712@163.com | | MENG Lei | School of Breeding and Multiplication, Hainan University, Sanya 572025, China | menglei@hainanu.edu.cn |
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| Abstract: |
| To investigate the effects of fungicides on N2O emissions from vegetable soils in Hainan during winter, this study conducted a laboratory incubation experiment with four treatments: control（CK）, carbendazim（CAR）, difenoconazole（DIF）, and azoxystrobin（AZO）. The results demonstrated that compared to CK, CAR, DIF, and AZO treatments significantly increased cumulative N2O emissions by 23.38%, 27.27%, and 27.28%, respectively. The DIF treatment enhanced denitrification potential by 9.57% compared to CK and significantly elevated soil enzyme activities（β-glucosidase, N-acetyl-β-D-glucosaminidase, and acid phosphatase）. In contrast, CAR and AZO treatments reduced denitrification potential, potentially inhibiting the conversion of N2O to N2 and thereby increasing N2O emissions. Furthermore, the relative contributions of fungal denitrification in CAR, DIF, and AZO treatments were significantly elevated by 52.17%, 53.15%, and 46.42%, respectively, compared to CK. Fungicides reduced soil pH, which favored fungal activity and shifted N2O production pathways from bacterial-dominated to fungal-dominated denitrification, ultimately amplifying N2O emissions. This study reveals that fungicides may indirectly enhance N2O emissions in winter vegetable soils of Hainan by altering microbial communities and nitrogen transformation processes. |
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