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Article Navigation >  Chinese Geographical Science  > 2015  >  25(4): 438-450

LAN Yan, CUI Baoshan, HAN Zhen, LI Xia, LI Fengju, ZHANG Yongtao. Spatial Distribution and Environmental Determinants of Denitrification Enzyme Activity in Reed-Dominated Raised Fields[J]. Chinese Geographical Science, 2015, 25(4): 438-450. doi: 10.1007/s11769-014-0721-2
Citation: LAN Yan, CUI Baoshan, HAN Zhen, LI Xia, LI Fengju, ZHANG Yongtao. Spatial Distribution and Environmental Determinants of Denitrification Enzyme Activity in Reed-Dominated Raised Fields[J]. Chinese Geographical Science, 2015, 25(4): 438-450. doi: 10.1007/s11769-014-0721-2
shu

Spatial Distribution and Environmental Determinants of Denitrification Enzyme Activity in Reed-Dominated Raised Fields

doi: 10.1007/s11769-014-0721-2

  • School of Environment, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Beijing Normal University, Beijing 100875, China

Funds:  Under the auspices of National Science Fund for Distinguished Young Scholars (No. 51125035), National Science Foundation for Innovative Research Group (No. 51121003), Major Science and Technology Program for Water Pollution Control and Treatment (No. 2009ZX07209-008)
More Information
  • Corresponding author: CUI Baoshan. E-mail: cuibs@bnu.edu.cn
  • Received Date: 2013-05-09
  • Rev Recd Date: 2013-09-09
  • Publish Date: 2015-04-27
  • Denitrification is an important process of nitrogen removal in lake ecosystems. However, the importance of denitrification across the entire soil-depth gradients including subsurface layers remains poorly understood. This study aims to determine the spatial pattern of soil denitrification enzyme activity (DEA) and its environmental determinants across the entire soil depth gradients in the raised fields in Baiyang Lake, North China. In two different zones of the raised fields (i.e., water boundary vs. main body of the raised fields), the soil samples from -1.0 m to 1.1 m depth were collected, and the DEA and following environmental determinants were quantified: soil moisture, pH, total nitrogen (TN), ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3--N), total organic carbon (TOC), and rhizome biomass of Phragmites australis. The results showed that the soil DEA and environmental factors had a striking zonal distribution across the entire soil depth gradients. The soil DEA reached two peak values in the upper and middle soil layers, indicating that denitrification are important in both topsoil and subsurface of the raised fields. The correlation analysis showed that the DEA is negatively correlated with the soil depth (p < 0.05). However, this phenomenon did not occur in the distance to the water edge, except in the upper layers (from 0.2 m to 0.7 m) of the boundary zone of the raised fields. In the main body of the raised fields, the DEA level remained high; however, it showed no significant relationship with the distance to the water edge. The linear regression analysis showed significant positive correlation of the DEA with the soil TN, NO3--N, NH4+-N, and TOC; whereas it showed negative correlation with soil pH. No significant correlations with soil moisture and temperature were observed. A positive correlation was also found between the DEA and rhizome biomass of P. australis.
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Spatial Distribution and Environmental Determinants of Denitrification Enzyme Activity in Reed-Dominated Raised Fields

doi: 10.1007/s11769-014-0721-2
  • School of Environment, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Beijing Normal University, Beijing 100875, China
Funds:  Under the auspices of National Science Fund for Distinguished Young Scholars (No. 51125035), National Science Foundation for Innovative Research Group (No. 51121003), Major Science and Technology Program for Water Pollution Control and Treatment (No. 2009ZX07209-008)
    Corresponding author: CUI Baoshan. E-mail: cuibs@bnu.edu.cn
  • Received Date: 2013-05-09
  • Rev Recd Date: 2013-09-09
  • Publish Date: 2015-04-27

Abstract: Denitrification is an important process of nitrogen removal in lake ecosystems. However, the importance of denitrification across the entire soil-depth gradients including subsurface layers remains poorly understood. This study aims to determine the spatial pattern of soil denitrification enzyme activity (DEA) and its environmental determinants across the entire soil depth gradients in the raised fields in Baiyang Lake, North China. In two different zones of the raised fields (i.e., water boundary vs. main body of the raised fields), the soil samples from -1.0 m to 1.1 m depth were collected, and the DEA and following environmental determinants were quantified: soil moisture, pH, total nitrogen (TN), ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3--N), total organic carbon (TOC), and rhizome biomass of Phragmites australis. The results showed that the soil DEA and environmental factors had a striking zonal distribution across the entire soil depth gradients. The soil DEA reached two peak values in the upper and middle soil layers, indicating that denitrification are important in both topsoil and subsurface of the raised fields. The correlation analysis showed that the DEA is negatively correlated with the soil depth (p < 0.05). However, this phenomenon did not occur in the distance to the water edge, except in the upper layers (from 0.2 m to 0.7 m) of the boundary zone of the raised fields. In the main body of the raised fields, the DEA level remained high; however, it showed no significant relationship with the distance to the water edge. The linear regression analysis showed significant positive correlation of the DEA with the soil TN, NO3--N, NH4+-N, and TOC; whereas it showed negative correlation with soil pH. No significant correlations with soil moisture and temperature were observed. A positive correlation was also found between the DEA and rhizome biomass of P. australis.

LAN Yan, CUI Baoshan, HAN Zhen, LI Xia, LI Fengju, ZHANG Yongtao. Spatial Distribution and Environmental Determinants of Denitrification Enzyme Activity in Reed-Dominated Raised Fields[J]. Chinese Geographical Science, 2015, 25(4): 438-450. doi: 10.1007/s11769-014-0721-2
Citation: LAN Yan, CUI Baoshan, HAN Zhen, LI Xia, LI Fengju, ZHANG Yongtao. Spatial Distribution and Environmental Determinants of Denitrification Enzyme Activity in Reed-Dominated Raised Fields[J]. Chinese Geographical Science, 2015, 25(4): 438-450. doi: 10.1007/s11769-014-0721-2
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