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| Effects of different microplastic types，sizes，and concentrations on acidic soil N2O emissions |
| Received:October 04, 2024 |
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| KeyWord:microplastics;N2O emissions;soil nitrogen transformation;soil properties;acidic soil |
| Author Name | Affiliation | E-mail | | XU Xintong | Jiangxi Provincal Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China | | | GUO Wenyan | Jiangxi Provincal Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China
Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110801, China | | | BAI Jian | Jiangxi Provincal Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China | | | YU Yadi | Jiangxi Provincal Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China | | | LIU Jie | Jiangxi Provincal Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China
Yanchi Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China | | | YU Qingye | Jiangxi Provincal Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China | | | WANG Shuli | Jiangxi Provincal Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China | | | LIU Liangying | Jiangxi Provincal Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China | | | ZHANG Ling | Jiangxi Provincal Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China | lingzhang09@126.com |
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| Abstract: |
| This study aims to investigate the effects of various microplastic characteristics on soil nitrogen transformation and N2O emissions. The acidic Camellia oleifera soils was studied object, a 45 d laboratory incubation experiment was conducted, including a control group without microplastic addition（CK）and treatment groups with different types（polyethylene（PE）, polyvinyl chloride（PVC）, polylactic acid（PLA）, and polyhydroxyalkanoates（PHA））, sizes（150 μm and 2-4 mm）, and concentrations（1%, 5%, and 10%）of microplastics. This study systematically examined their effects on soil pH, ammonium nitrogen, nitrate nitrogen, N2O emissions, as well as net nitrogen mineralization rate（NMR）and net nitrification rate（NNR）. These findings indicated that the type, size, and concentration of microplastics significantly affected N2O emissions. For 150 μm-size biodegradable microplastics, PHA treatment exhibited the highest soil cumulative N2O emissions, reaching（490.49±56.04）ng·g-1·h-1, while NMR and NNR were 92.1% and 91.9% higher than the control, respectively. For the 2-4 mm size, traditional microplastics, especially PE, produced the highest cumulative N2O emissions, which increased with concentration. However, PE treatment resulted in a 27.29% lower NMR compared to the control, while biodegradable microplastics consistently showed the highest NNR across concentrations, significantly exceeding the control by 31.96%. Therefore, the distinct characteristics of microplastics play a crucial role in influencing net nitrogen mineralization and nitrification rates, as well as N2O emissions, in acidic Camellia oleifera soils. |
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