Drying-Rewetting Effects on Soil Nitrogen and Enzyme Activities Dynamics

Abstract:

With climate changes, soil may experience frequent drying-rewetting events. Water stress influences soil nitrogen transformation by affecting microbial growth and enzyme activities. The objective of this study was to determine effects of drying-rewetting cycles on soil N transformations and enzyme activities involved. The results show high correlations between soil inorganic N (NH₄⁺-N & NO₃^--N) concentrations and soil moisture. Drying and rewetting events contributed to the accumulation of NO₃^--N. There was a significant correlation between NH₄⁺-N/TDN and urease activities with a correlation coefficient of 0.88. Denitrifying enzyme activity showed a high positive correlation with soil moisture.

• Periodical: Applied Mechanics and Materials (Volumes 409-410)
• Pages: 256-261
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.409-410.256
• Online since: September 2013
• Authors: Yuan Wang, Yingying Zheng, Xin Shan Song*, Deng Hua Yan
• Keywords: Drying-Rewetting, Soil Enzyme Activity, Soil Moisture, Soil Nitrogen

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