Effects of altered precipitation patterns on soil nitrogen transformation in different landscape types during the growing season in northern China

[Display omitted] •Soil inorganic N pools are higher in fixed dune than in dune grassland.•Soil NO3−-N concentration increase with decrease in precipitation.•Altered precipitation patterns do not change soil N transformation.•Soil N transformation increases with EC, NO3−-N and NH4+-N concentrations....

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Published in:Catena (Giessen) 2023-03, Vol.222, p.106813, Article 106813
Main Authors: Lv, Peng, Sun, Shanshan, Zhao, Xueyong, Li, Yuqiang, Zhao, Shenglong, Zhang, Jing, Hu, Ya, Guo, Aixia, Yue, Ping, Zuo, Xiaoan
Format: Article
Language:English
Subjects:
catenas
China
climate change
electrical conductivity
Interannual patterns
Landscape type
landscapes
mineralization
nitrate nitrogen
nitrification
nitrogen
Precipitation regime changes
rain
Seasonal patterns
soil fertility
Soil inorganic N pool
Soil net N transformation
soil water content
structural equation modeling
vegetation cover
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Summary:[Display omitted] •Soil inorganic N pools are higher in fixed dune than in dune grassland.•Soil NO3−-N concentration increase with decrease in precipitation.•Altered precipitation patterns do not change soil N transformation.•Soil N transformation increases with EC, NO3−-N and NH4+-N concentrations. The soil nitrogen (N) cycle and transformation rate are susceptible to precipitation regime changes in semiarid sandy ecosystems, and they play important roles in both the soil fertility and in plant interactions. However, the response mechanisms of soil N transformation to changing precipitation regimes in semiarid ecosystems are still unclear. Thus, we conducted a three-year rainfall manipulation experiment along a landscape evolution gradient from fixed dunes to dune grasslands in a semiarid sandy region of northern China during the growing season (from May to September) between 2017 and 2019. The study included a contrast (P0: natural precipitation) and four treatments in which precipitation was decreased and increased by 60 % [P(−S) and P(+S)] between May and September and decreased and increased by 100 % [(P(−J) and P(+J)] between May and June. The soil nitrate nitrogen (NO3−-N) and inorganic N concentrations significantly increased under P(−S) and P(−J) (P 
ISSN:0341-8162
1872-6887
DOI:10.1016/j.catena.2022.106813