文献类型： 外文期刊

作者： Wang, Bin ¹ ; Guo, Chen ² ; Wan, Yunfan ¹ ; Li, Jianling ³ ; Ju, Xiaotang ⁴ ; Cai, Weiwei ⁵ ; You, Songcai ¹ ; Qin, Xiaob ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Key Lab Agr Environm, Minist Agr & Rural Affairs, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China

2.Inner Mongolia Acad Agr & Anim Husb Sci, Plant Protect Inst, Hohhot 010031, Inner Mongolia, Peoples R China

3.Chinese Acad Sci, South China Bot Garden, Guangzhou 510650, Peoples R China

4.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China

5.Yangtze Univ, Coll Agr, Jingzhou 434025, Peoples R China

关键词： Warming; CO2 enrichment; N uptake; N translocation; N surplus; N use efficiency

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 706 卷

页码：

收录情况： SCI

摘要： Effectiveness of N might be modified in rice cultivation under future climate change with elevated atmospheric CO2 concentration ([CO2]). At present, limited information is available to understand how plant N uptake and N use efficiency respond to elevated [CO2] and/or temperature in Chinese double rice cropping systems. A four-year field experiment was therefore conducted using open-top chambers with varying [CO2] (ambient, ambient +60 mu mol mol(-1)) and varying temperature (ambient, ambient +2 degrees C) in Hubei Province, Central China. Compared with ambient conditions, elevated [CO2] increased plant N uptake and N use efficiency, as measured by fertilizer N recovery efficiency (NRE), N agronomic efficiency (NAE), N physiological efficiency (NPE) and apparent system N use efficiency (NUEsys), in both early rice and late rice. CO2 enrichment tended to decrease soil mineral N concentration since more N was assimilated by plants. Elevated temperature led to lower plant N uptake and decreased NRE and NAE in early rice, clue to a reduction in grain yield induced by heat injury. In contrast, warming increased plant N uptake and N use efficiency in late rice as no heat stress existed. Warming tended to increase soil mineral N concentration in early rice but had negligible effects in late rice. When elevated [CO2] and temperature were combined, the positive effects of CO2 enrichment for N utilization were able to compensate for the negative effects of warming in early rice, while the interaction was synergetic in late rice. Hence, co-elevation of [CO2] and temperature led to higher N use efficiency (64.6% for NUEsys across four years) and decreased annual N surplus by 23.6-36.5 kg N ha(-1) compared with ambient conditions. Our findings confirm that CO2 enrichment and air warming can improve N use efficiency at both crop level and system level in Chinese double rice cultivation. (C) 2019 Elsevier B.V. All rights reserved.