农业环境科学学报2025，Vol.44Issue(1)：227-234,8.DOI:10.11654/jaes.2024-0035
草海自然保护区内不同利用方式土壤氮素转化和氧化亚氮排放特征
Nitrogen transformation characteristics and nitrous oxide emissions from soils under different land use types in Caohai nature reserve
摘要
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.关键词
草海/土地利用方式/矿化/硝化/N2OKey words
Caohai/land use type/mineralization/nitrification/N2O分类
农业科技引用本文复制引用
郎漫,聂浩,朱恺文,朱四喜,李平..草海自然保护区内不同利用方式土壤氮素转化和氧化亚氮排放特征[J].农业环境科学学报,2025,44(1):227-234,8.基金项目
中央土壤污染防治资金项目(新集采单[2021]1468) （新集采单[2021]1468）
国家自然科学基金项目(41301345) National Special Fund Project for Soil Pollution Prevention and Control([2021]1468) （41301345）
National Natural Science Foundation of China(41301345) （41301345）
