Warming increase the N2O emissions from wheat fields but reduce the wheat yield in a rice-wheat rotation system
文献类型： 外文期刊
作者： Ma, Chao 1 ; Liu, Yingduo 1 ; Wang, Jing 2 ; Xue, Lixiang 3 ; Hou, Pengfu 1 ; Xue, Lihong 1 ; Yang, Linzhang 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Key Lab Agroenvironm downstream Yangze Plain, Minist Agr & Rural Affairs China, Nanjing 210014, Peoples R China
2.Anhui Agr Univ, Sch Resources & Environm, Anhui Prov Key Lab Farmland Ecol Conservat & Pollu, Hefei 230036, Peoples R China
3.Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China
4.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Peoples R China
5.Jiangsu Acad Agr Sci, 50 Zhongling St, Nanjing 210014, Peoples R China
关键词： Simulated warming; N 2 O emissions; Grain yield; nir K gene
期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.576； 五年影响因子：7.088 ）
ISSN： 0167-8809
年卷期： 2022 年 337 卷
页码：
收录情况： SCI
摘要： Global warming often affects the greenhouse gas (GHG) emissions, yet the effect of simulated warming on GHG emissions from wheat fields, the major source of nitrous oxide (N2O) emissions, is still unclear. Therefore, using a free-air temperature increase system, we conducted a two-year field experiment to explore the effects of simulated warming on N2O and methane (CH4) emissions as well as wheat yields in a rice-wheat rotation system. Our results showed that compared with the ambient control, warming increased the cumulative seasonal emissions of N2O by 34.21 % (P < 0.05), but did not affect the seasonal CH4 emissions in the two years. Soil C/N ratio, pH, nirK gene and (nirK+nirS)/nosZ ratio were the main causes affecting N2O emissions. Warming reduced the wheat yield by 19.42 % mainly due to the reduction of panicles and shorter vegetative growth (P < 0.05). Greenhouse gas intensity of warming treatment was 10.42 % higher than that of the ambient control. Our findings indicate that warming may reduce the wheat yield but increase N2O emissions in China's wheat-rice rotation system and emphasize the need for agronomic practices of high wheat yields and low GHG emissions in the climate change world.
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