Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15290 |
Increased greenhouse gas emissions intensity of major croplands in China: Implications for food security and climate change mitigation | |
Jingting Zhang; Hanqin Tian; Hao Shi; Jingfang Zhang; Xiaoke Wang; Shufen Pan; Jia Yang | |
2020-09-02 | |
发表期刊 | Global Change Biology |
出版年 | 2020 |
英文摘要 | Balancing crop production and greenhouse gas (GHG) emissions from agriculture soil requires a better understanding and quantification of crop GHG emissions intensity, a measure of GHG emissions per unit crop production. Here we conduct a state‐of‐the‐art estimate of the spatial‐temporal variability of GHG emissions intensities for wheat, maize, and rice in China from 1949 to 2012 using an improved agricultural ecosystem model (Dynamic Land Ecosystem Model‐Agriculture Version 2.0) and meta‐analysis covering 172 field‐GHG emissions experiments. The results show that the GHG emissions intensities of these croplands from 1949 to 2012, on average, were 0.10–1.31 kg CO2‐eq/kg, with a significant increase rate of 1.84–3.58 × 10–3 kg CO2‐eq kg−1 year−1. Nitrogen fertilizer was the dominant factor contributing to the increase in GHG emissions intensity in northern China and increased its impact in southern China in the 2000s. Increasing GHG emissions intensity implies that excessive fertilizer failed to markedly stimulate crop yield increase in China but still exacerbated soil GHG emissions. This study found that overfertilization of more than 60% was mainly located in the winter wheat–summer maize rotation systems in the North China Plain, the winter wheat–rice rotation systems in the middle and lower reaches of the Yangtze River and southwest China, and most of the double rice systems in the South. Our simulations suggest that roughly a one‐third reduction in the current N fertilizer application level over these “overfertilization” regions would not significantly influence crop yield but decrease soil GHG emissions by 29.60%–32.50% and GHG emissions intensity by 0.13–0.25 kg CO2‐eq/kg. This reduction is about 29% and 5% of total agricultural soil GHG emissions in China and the world, respectively. This study suggests that improving nitrogen use efficiency would be an effective strategy to mitigate GHG emissions and sustain China's food security. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/293036 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Jingting Zhang,Hanqin Tian,Hao Shi,et al. Increased greenhouse gas emissions intensity of major croplands in China: Implications for food security and climate change mitigation[J]. Global Change Biology,2020. |
APA | Jingting Zhang.,Hanqin Tian.,Hao Shi.,Jingfang Zhang.,Xiaoke Wang.,...&Jia Yang.(2020).Increased greenhouse gas emissions intensity of major croplands in China: Implications for food security and climate change mitigation.Global Change Biology. |
MLA | Jingting Zhang,et al."Increased greenhouse gas emissions intensity of major croplands in China: Implications for food security and climate change mitigation".Global Change Biology (2020). |
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