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Differences in Soil Nitrogen Availability and Transformation in Relation to Land Use in the Napahai Wetland, Southwest China

  • Xuelian Guo
  • Li Chen
  • Rongbo ZhengEmail author
  • Kun Zhang
  • Yuping Qiu
  • Haitao Yue
Research Article
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Abstract

Changes in land use can affect soil nitrogen availability and transformation as well as atmospheric N2O concentration and global warming. The total nitrogen (N), NH4+-N, NO3-N, net N mineralization, and denitrification of natural wetland, grazing meadow, and cropland soils in Napahai Wetland were measured to determine whether the conversion of natural wetland to grazing meadow or cropland significantly impacts soil N availability and transformation. The results showed that grazing meadow and cropland soils exhibited significantly lower total N and inorganic N concentrations than those of natural wetland soils. The net N mineralization rate was higher in the natural wetland soils than that in the grazing meadow soils. The net N mineralization rate of cropland soils was highest in spring and summer but was at its lowest in autumn. Soils of natural wetlands had higher denitrification rates than those of grazing meadows, while cropland soils had higher denitrification rates than those of natural wetlands. These data suggest that the conversion of natural wetland to grazing meadow substantially decreases total N and inorganic N concentrations, net N mineralization, net nitrification, and denitrification. Conversions of natural wetland to cropland could also decrease the total N and inorganic N concentrations throughout the growing seasons but increase both N mineralization, in spring and summer, and denitrification rates, in May, September, and November. Natural wetland soils have higher N availability and N transformation rates than those of grazing meadow soils and cropland soils, indicating that natural wetland would have the greater potential effect on climate change.

Keywords

Nitrogen mineralization Nitrification Denitrification Land use type Napahai 

Notes

Acknowledgments

We greatly acknowledge Professor Joy Zedler (Wisconsin University-Madison) for her helpful comments and assistance in English editing.

Funding Information

This work was supported by the National Natural Science Foundation of China (Nos. 41563008).

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Copyright information

© Sociedad Chilena de la Ciencia del Suelo 2019

Authors and Affiliations

  • Xuelian Guo
    • 1
  • Li Chen
    • 1
  • Rongbo Zheng
    • 2
    Email author
  • Kun Zhang
    • 1
  • Yuping Qiu
    • 1
  • Haitao Yue
    • 1
  1. 1.National Plateau Wetlands Research CenterSouthwest Forestry UniversityKunmingPeople’s Republic of China
  2. 2.Chemical Engineering CollegeSouthwest Forestry UniversityKunmingPeople’s Republic of China

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