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| Nitrogen transformation characteristics and nitrous oxide emissions from soils under different land use types in Caohai nature reserve |
| Received:January 09, 2024 |
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| KeyWord:Caohai;land use type;mineralization;nitrification;N2O |
| Author Name | Affiliation | E-mail | | LANG Man | School of Ecology and Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | NIE Hao | School of Ecology and Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | ZHU Kaiwen | School of Changwang, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | ZHU Sixi | School of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China | | | LI Ping | School of Ecology and Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | pli@nuist.edu.cn |
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| Abstract: |
| This study aimed at exploring nitrogen transformations and nitrous oxide（N2O）emissions from soils in the Caohai nature reserve as well as providing a scientific basis for ecological environmental effect evaluation of soils under different land uses along with the related rational land layout. We performed a 15-day laboratory incubation experiment at 25 ℃ and 60%WHC（water holding capacity）to study net N transformation rates and greenhouse gas emissions from soils under different land use types. Our results demonstrated a net N mineralization rate of marshland soil of 0.95 mg·kg-1·d-1, being significantly lower than that of upland and vegetable soils（1.61 mg·kg-1· d-1 and 1.29 mg·kg-1·d-1, respectively）and significantly higher than that of forest soil（0.24 mg·kg-1·d-1）. The land use type effect on the net nitrification rate was in good agreement with net N mineralization rates, the latter being 3.71 mg·kg-1·d-1 and 3.58 mg·kg-1·d-1 for upland and vegetable soils, respectively, which was significantly higher than that of marshland soil（1.64 mg·kg-1·d-1）, while that of forest soil was the lowest（0.20 mg·kg-1·d-1）. The N2O cumulative emission from marshland soil（65.3 μg·kg-1）was the highest among the four land use types, followed by upland soil（29.3 μg·kg-1）and vegetable soil（21.4 μg·kg-1）, while the N2O cumulative emission of forest soil （4.45 μg·kg-1）was the lowest. Our results indicate that although marshland conversion into upland and vegetable fields might significantly reduce greenhouse gas emissions, the significantly stimulated N mineralization and nitrification could result in NO - 3 accumulation in the soil and increase the risk of N diffusion into the environment. Forest conversion into agricultural land significantly promotes greenhouse gas emissions and stimulates the net N mineralization and nitrification rates, leading to significantly negative effects on the ecological environment. |
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