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| Combined effects of nitrogen forms and temperature on soil organic carbon mineralization of forest in the sandy area of western Shandong Province, China |
| Received:June 20, 2022 |
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| KeyWord:nitrogen form;temperature;soil organic carbon mineralization;antagonistic effect;forest soil |
| Author Name | Affiliation | E-mail | | CHEN Qinghai | College of Geography and Environment, Liaocheng University, Liaocheng 252059, China
Liaocheng Key Laboratory of Agricultural Soil Environment and Pollution Prevention, Liaocheng 252059, China | | | TAO Baoxian | College of Geography and Environment, Liaocheng University, Liaocheng 252059, China
Liaocheng Key Laboratory of Agricultural Soil Environment and Pollution Prevention, Liaocheng 252059, China | taobaoxian@sina.com | | SHANG Yubing | State-owned Forest Farm Management and Service Center of Shenxian County, Liaocheng 252415, China | | | ZHAN Min | State-owned Forest Farm Management and Service Center of Shenxian County, Liaocheng 252415, China | | | LI Heyin | State-owned Forest Farm Management and Service Center of Shenxian County, Liaocheng 252415, China | | | LI Ganlin | College of Geography and Environment, Liaocheng University, Liaocheng 252059, China | | | LI Yanchun | College of Geography and Environment, Liaocheng University, Liaocheng 252059, China | |
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| Abstract: |
| The continuous increase in atmospheric nitrogen(N) deposition and global warming caused has significantly changed the mineralization of soil organic carbon(SOC) in forest ecosystem. Most studies have focused on the single effects of N deposition and temperature on SOC mineralization, and the combined effect of N forms and temperature on SOC mineralization is still poorly understood. Soil samples were collected from an artificial Populus nigra forest in the sandy area of western Shandong Province, and the combined effect of N forms(nitrate and ammonium) and temperatures(10, 20℃, and 30℃) on SOC mineralization was studied using an incubation experiment. The results showed that, compared to the control treatment, ammonium addition increased the cumulative SOC mineralization by 11.8%-21.3% at 10℃, indicating a N-limitation on the microbial decomposition of SOC. As the temperature increased to 20℃ and 30℃, the effect of ammonium nitrogen addition on SOC mineralization was negative. Nitrate addition reduced SOC mineralization during the entire incubation period. At the end of the incubation, the cumulative SOC mineralization after nitrate addition was reduced by 4.1%-11.5%(10℃), 9.1%-29.3%(20℃), and 8.6%-23.7%(30℃), respectively compared to that of the control treatment. Increased temperature enhanced SOC mineralization. The combined effect of temperature and N addition on SOC mineralization was antagonistic. The measured values of such interactions on SOC mineralization were 7.9%-21.9%(nitrate addition) and 16.1%-23.6%(ammonium addition) lower than theoretical values due to the decreased tendency of the temperature sensitivity of SOC mineralization after N addition. In general, nitrate and ammonium addition produce different effects on SOC mineralization. The interactive effect of N addition and temperature on SOC mineralization may have been overestimated based on their single effects. |
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