Quantifying soil nitrous oxide emissions in spring freezing-thawing period over different vegetation types in Northeast China Quantifying soil nitrous oxide emissions in spring freezing-thawing period over different vegetation types in Northeast China

最小化 最大化

Vol19 No.7: 1919-1930 

Title】Quantifying soil nitrous oxide emissions in spring freezing-thawing period over different vegetation types in Northeast China

Author】WU Bin1,2; MU Chang-cheng3*; LIU Hui4; XU Ya-kun5; ZHANG Yue6; YANG Jia-shuo5; XU Wen-nian7,8*

Addresses】1 Hubei Key Laboratory of Construction and Management in Hydropower Engineering, China Three Gorges University, Yichang 443002, China; 2 College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China; 3 Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management, Northeast Forestry University, Harbin 150040, China; 4 Survey, Planning and Design Institute of Daxinganling, National Forestry and Grassland Administration, Daxinganling 165100, China; 5 Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China; 6 State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 7 Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China; 8 Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Yichang 443002, China

Corresponding author】XU Wen-nian

Citation】Wu B, Mu CC, Liu H, et al. (2022) Quantifying soil nitrous oxide emissions in spring freezing-thawing period over different vegetation types in Northeast China. Journal of Mountain Science 19(7). https://doi.org/10.1007/s11629-021-6894-0

DOI】https://doi.org/10.1007/s11629-021-6894-0

Abstract】Environmental changes significantly alter the structure, diversity and activity of soil microbial communities during spring freezing-thawing period, leading to changes in the soil microbial nitrogen cycle.Changes in N2O fluxes after land use conversion from primary forest to secondary forest, Korean pine plantation and cropland in northeast China have not been quantified. Field experiments were conducted to measure soil N2O fluxes in a primary forest, twosecondary forests, a Korean pine plantation, and one maize fieldin a temperate region in northeast China from 2017-03-06 to 2017-05-28.During the experimental period, the soil was exclusively a nitrogen source for all land uses. We found that N2O emissions ranged from 15.63 to 68.74 μg m−2 h−1, and cumulative N2O emissions ranged from 0.33 to 2.10 kg ha−1 during the period.Cumulative N2O emissionsfromthe maize fieldwere significantly higher than that from primary forest, Korean pine plantation, hardwood forest, and Betula platyphylla forest by 262.1% to 536.4%.Compared with other ecosystems in similar studies, the N2O emission rates of all ecosystem types in this study were low during the spring thaw period. Stepwise multiple linear regression indicated that there were significant correlations between N2O emissions and environmental factors (air temperature and soil temperature, soil water content, soil pH, NH4+-N, NO3-N, and soil organic carbon). The results showed that conversion of land use from primary forest to hardwood forest, Korean pine plantationor maize field greatly increased soil N2O emissions during spring freezing-thawing period, and N2O emissions from primary forest were almost the same as those from Betula platyphylla forest.

Keywords】N2O emission; Land use change;Environmental factors; Nitrogen cycle