| Change of soil nitrogen mineralization in dryland during the summer fallow |
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| DOI：10.7606/j.issn.1000-7601.2016.01.14 |
| Key Words: summer fallow dry land cumulative mineralized N N mineralization potential |
| Author Name | Affiliation | | MA Le-le | College of Natural Resource and Environment, Northwest A&F University, Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, MOA, Yangling, Shaanxi 712100, China | | XIA Meng-jie | College of Natural Resource and Environment, Northwest A&F University, Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, MOA, Yangling, Shaanxi 712100, China | | JIANG Yong-ji | College of Natural Resource and Environment, Northwest A&F University, Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, MOA, Yangling, Shaanxi 712100, China | | ZHOU Jian-bin | College of Natural Resource and Environment, Northwest A&F University, Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, MOA, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The Stanford and Smith aerobic incubation method was used to study the changes of nitrogen (N) mineraization from soils from farmer's fields and by nitrogen application treatments before and after summer fallow in the Loess Plateau. Compared to that before summer fallow, soil N mineralization after summer fallow in Changwu and Yangling was decreased by 29.52% and 7.15%, respectively. The cumulative mineralized N also was decreased significantly in long-term non-N fertilization after summer fallow. However, significant differences were detected for the two different N fertilization treatments. Correlation analysis showed significant positive correlations between the cumulative mineralized N and soil organic matter and total N before summer fallow. Two pools of first-order kinetic equation were used to model the curves of N mineralization from different soils. The results indicated that mineralized N potential (N1) in soils of Changwu and Yangling after summer fallow were decreased by 85% and 66%, respectively. Therefore, summer fallow significantly reduced the mineralization of N in soil. |
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