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Food benefit and climate warming potential of nitrogen fertilizer uses in China
Chemical nitrogen (N) fertilizer has long been used to help meet the increasing food demands in China, the top N fertilizer consumer in the world. Growing concerns have been raised on the impacts of N fertilizer uses on food security and climate change, which is lack of quantification. Here we use a carbon–nitrogen (C–N) coupled ecosystem model, to quantify the food benefit and climate consequence of agronomic N addition in China over the six decades from 1949 to 2008. Results show that N fertilizer-induced crop yield and soil C sequestration had reached their peaks, while nitrous oxide (N _2 O) emission continued rising as N was added. Since the early 2000s, stimulation of excessive N fertilizer uses to global climate warming through N _2 O emission was estimated to outweigh their climate benefit in increasing CO _2 uptake. The net warming effect of N fertilizer uses, mainly centered in the North China Plain and the middle and lower reaches of Yangtze River Basin, with N _2 O emission completely counteracting or even exceeding, by more than a factor of 2, the CO _2 sink. If we reduced the current N fertilizer level by 60% in ‘over-fertilized’ areas, N _2 O emission would substantially decrease without significantly influencing crop yield and soil C sequestration.
Food benefit and climate warming potential of nitrogen fertilizer uses in China
Chemical nitrogen (N) fertilizer has long been used to help meet the increasing food demands in China, the top N fertilizer consumer in the world. Growing concerns have been raised on the impacts of N fertilizer uses on food security and climate change, which is lack of quantification. Here we use a carbon–nitrogen (C–N) coupled ecosystem model, to quantify the food benefit and climate consequence of agronomic N addition in China over the six decades from 1949 to 2008. Results show that N fertilizer-induced crop yield and soil C sequestration had reached their peaks, while nitrous oxide (N _2 O) emission continued rising as N was added. Since the early 2000s, stimulation of excessive N fertilizer uses to global climate warming through N _2 O emission was estimated to outweigh their climate benefit in increasing CO _2 uptake. The net warming effect of N fertilizer uses, mainly centered in the North China Plain and the middle and lower reaches of Yangtze River Basin, with N _2 O emission completely counteracting or even exceeding, by more than a factor of 2, the CO _2 sink. If we reduced the current N fertilizer level by 60% in ‘over-fertilized’ areas, N _2 O emission would substantially decrease without significantly influencing crop yield and soil C sequestration.
Food benefit and climate warming potential of nitrogen fertilizer uses in China
Hanqin Tian (author) / Chaoqun Lu (author) / Jerry Melillo (author) / Wei Ren (author) / Yao Huang (author) / Xiaofeng Xu (author) / Mingliang Liu (author) / Chi Zhang (author) / Guangsheng Chen (author) / Shufen Pan (author)
2012
Article (Journal)
Electronic Resource
Unknown
Metadata by DOAJ is licensed under CC BY-SA 1.0
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