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[1]SUN Wenhao,YANG Shiwei,GAO Xiaodong,et al.Characteristics of CO2 and N2O Emissions Under Different Land-use Types in Loess Hilly Region of China[J].Research of Soil and Water Conservation,2017,24(01):68-74.

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Characteristics of CO₂ and N₂O Emissions Under Different Land-use Types in Loess Hilly Region of China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 01 Page number: 68-74 Column: Public date: 2017-02-28

Title:: Characteristics of CO₂ and N₂O Emissions Under Different Land-use Types in Loess Hilly Region of China

Author(s):: SUN Wenhao¹, YANG Shiwei³, GAO Xiaodong^2,3, LI Lusheng¹, LING Qiang¹, LI Hongchen¹; 1. College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Water Saving Agriculture in Arid Regions of China, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: soil; CO₂; N₂O; greenhouse-gas; grain for green project; land-use change

CLC:: S152

DOI:: -

Abstract:: Investigation of the effects of land-use change on soil CO₂ and N₂O fluxes under the conversion of cropland to forest and grassland in loess hilly region would be helpful to understand the context of global warming. Using static chambers method, soil CO₂ and N₂O fluxes were investigated during the growing season under three land-use types (cropland, jujube orchard and abandoned grassland) in the study area in 2014. Additionally, soil temperature and moisture at 10 cm depth were monitored using mercurial thermometer and potable time domain reflectometry respectively to explore the correlations between environmental factors and soil gas emissions. During the growing season, the emission rates of CO₂ in cropland, jujube orchard and abandoned grassland were 110.66～531.79 mg/ (m²·h), 74.01～437.27 mg/ (m²·h) and 52.56～267.20 mg/ (m²·h), respectively, which peaked in summer and were correlated with soil temperature in all land-use types. Soil N₂O under different land-use types followed similar seasonal patterns which were related to vegetative growth, the higher emission rate occurred in June and July compared with other growing period when negative fluxes frequently occurred, and the values varying -3.82～19.78 μg/ (m²·h), -4.21～28.10 μg/ (m²·h), -8.77～16.76 μg/ (m²·h) in cropland, jujube orchard and abandoned grassland, respectively. Linear correlation analysis showed that, for both land-use types, relationship between soil CO₂ (N₂O) fluxes and soil temperature at 10 cm depth was better than the relationship between soil CO₂ (N₂O) fluxes and soil moisture, while no relationship was found between soil N₂O flux and soil moisture due to the complicated mechanism of nitrification and denitrification processes. Moreover, binary linear regression analysis on the relationship of soil temperature and soil moisture could explain 54%～78% of soil CO₂ seasonal variations. Our research results showed that soil N₂O increased (p < 0.01) with the better substantial condition after converting cropland into grassland, however, no statistics difference was observed in the case of CO₂ emissions, which were probably caused by the low temperature in grassland. The conversion of cropland to orchard led to the lower soil CO₂ and N₂O emission rates (42.1%～92.7%) due to intensive field management which may also contribute to more negative flux of N₂O in economic forest.

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