Title：
Revegetation impacts soil nitrogen dynamics in the water level？uctuation zone of the Three Gorges Reservoir, China
Authors：
Corresponding
Author：
Chen Ye, Xiaoli Cheng*, Wenzhi Liu, Quanfa Zhang
Pubyear：
2015
Title of
Journal：
Science of The Total Environment
Paper
Code：
Volume：
517
Number：
Page：
76-85
Others：
Classification：
Source：
Abstract：
Revegetations in riparian ecosystem are important in regulating soil nitrogen (N) dynamics. However, impacts of revegetation on soil N cycling and thereby on ecosystem functioning are not fully understood.We conducted an in situ incubation in thewater level fluctuation zone(WLFZ) of the Three Gorges Reservoir region to evaluate soil N transformation including net N mineralization rate, net ammonification rate, net nitrification rate, net denitrification rate, N leaching and plant N uptake aswell as the soil inorganic N (NH4 +-N and NO3 .-N) concentration in the top soils (0–20 cm) following revegetations (implementing tree, shrub and herb plantations) over two years. The soil inorganic N concentration and N leaching were lower in the tree soils than in herb and shrub soils. Tree plantations decreased net N mineralization rate and net ammonification rate compared to herb and shrub soils, possibly due to lower soil organic carbon (SOC) input and soil temperatures.Whereas tree plantations increased soil net denitrification rate compared to herb and shrub soils because of higher tree NO3 .-N uptake togetherwith higher net nitrification rate. The inorganic N in the tree and shrub soils were lower in fall and summer, respectively, which was dependent on the seasonal variations in plant N uptake, soil N transformation, and N leaching. Thus, our results suggest that tree plantations could decrease soil inorganic N concentration and N leaching by altering both the quantity and quality of SOC and thereby potentially improve water quality in the riparian zone.
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