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- W2371103265 abstract "Biological nitrogen fixation was an important natural part of agricultural eco-system.It was necessary to study the inputs and history changes of nitrogen fixation in different regions for the resource analysis and management of active nitrogen in agriculture system.Based on the cropland,grazing grassland and biological fixation rates,the active nitrogen from the crop planting in recent twenty years were estimated in this study.The results showed that the nitrogen fixation kept stable in recent 20 years.The active nitrogen from the planted crops and the grazing lands were 4.81 and 3.27 tons per year,respectively.The leguminous crops were the main sources of active nitrogen,followed by rice and sugarcane.The nitrogen fixation in north,northeast and the middle-lower reaches of Changjiang river was 3.18 tons per year and the three regions were the main source of active nitrogen.From the space perception the active nitrogen in north areas was higher than the south,and the east was higher than the west." @default.
- W2371103265 created "2016-06-24" @default.
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- W2371103265 date "2013-01-01" @default.
- W2371103265 modified "2023-09-25" @default.
- W2371103265 title "The Temporal and Spatial Distribution of Nitrogen Fixation in China Agro-ecosystem" @default.
- W2371103265 hasPublicationYear "2013" @default.
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