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| Effects of substrate improvement on nitrogen removal in winter and soil-plant stoichiometric characteristics in reed（Phragmites australis）area of a riparian zone |
| Received:May 20, 2022 |
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| KeyWord:substrate;riparian zone;reed wetland;nitrogen;stoichiometric characteristic |
| Author Name | Affiliation | E-mail | | FU Zishi | Shanghai Academy of Agricultural Science, Shanghai 201403, China
Shanghai Engineering Research Centre of Low-Carbon Agriculture, Shanghai 201415, China | | | LIU Fuxing | Shanghai Academy of Agricultural Science, Shanghai 201403, China
Shanghai Engineering Research Centre of Low-Carbon Agriculture, Shanghai 201415, China | | | WANG Junli | Shanghai Academy of Agricultural Science, Shanghai 201403, China
Shanghai Engineering Research Centre of Low-Carbon Agriculture, Shanghai 201415, China | wangjunli@saas.sh.cn | | QIAO Hongxia | Shanghai Academy of Agricultural Science, Shanghai 201403, China
Shanghai Engineering Research Centre of Low-Carbon Agriculture, Shanghai 201415, China | | | BI Yucui | Shanghai Academy of Agricultural Science, Shanghai 201403, China
Shanghai Engineering Research Centre of Low-Carbon Agriculture, Shanghai 201415, China | |
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| Abstract: |
| We explored the effects of substrate improvement on nitrogen removal in winter and soil-plant stoichiometric characteristics in the reed（Phragmites australis）area of a subtropical riparian zone in a reed wetland simulation experiment using the riparian soil substrate as the control. Wetland N removal in winter, C, N and P contents, and their stoichiometric ratio in soil and plant organs were determined following addition of different substrates（gravel, gravel + biochar, ceramsite + biochar and modified ceramsite + biochar）. Substrate improvement enhanced N removal from the reed wetland in winter. Gravel addition increased NH4+-N removal efficiency by 8.3 percentage points（P<0.05）. Gravel+biochar addition increased both TN and NH4+-N removal efficiencies by 8.9 percentage points（P<0.05）. Substrate improvement increased soil TC, TN and TP. These increase were significant with gravel+ biochar addition（P<0.05）. The three treatments involving biochar addition were conducive to root C fixation and plant N absorption. Ceramsite+ biochar and modified ceramsite+ biochar addition promoted plant growth. There was a certain correlation between soil and plant stoichiometric characteristics, and the relationship between soil with stems and roots was greater. Compared with the effect of plant characteristics, N removal by reed wetlands in winter was more easily affected by soil stoichiometric characteristics under different substrate additions. These results conclude that proper substrate improvement can enhance N removal in winter, increase soil nutrients and promote plant growth in the riparian reed area of a subtropical zone. |
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