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Climatic Warming Increases Winter Wheat Yield but Reduces Grain Nitrogen Concentration in East China

文献类型： 外文期刊

作者： Tian, Yunlu 1 ; Zheng, Chengyan 2 ; Chen, Jin 3 ; Chen, Changqing 1 ; Deng, Aixing 2 ; Song, Zhenwei 2 ; Zhang, Baomin 1 ;

作者机构： 1.Nanjing Agr Univ, Inst Appl Ecol, Nanjing, Jiangsu, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Key Lab Crop Physiol & Ecol, Minist Agr, Beijing 100193, Peoples R China

3.Minist Agr, Soil & Fertilizer & Resources & Environm Inst, Jiangxi Acad Agr Sci, Key Lab Crop Ecophysiol & Farming Syst Middle & L, Nanchang, Peoples R China

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2014 年 9 卷 4 期

页码：

收录情况： SCI

摘要： Climatic warming is often predicted to reduce wheat yield and grain quality in China. However, direct evidence is still lacking. We conducted a three-year experiment with a Free Air Temperature Increase (FATI) facility to examine the responses of winter wheat growth and plant N accumulation to a moderate temperature increase of 1.5 degrees C predicted to prevail by 2050 in East China. Three warming treatments (AW: all-day warming; DW: daytime warming; NW: nighttime warming) were applied for an entire growth period. Consistent warming effects on wheat plant were recorded across the experimental years. An increase of ca. 1.5 degrees C in daily, daytime and nighttime mean temperatures shortened the length of pre-anthesis period averagely by 12.7, 8.3 and 10.7 d (P<0.05), respectively, but had no significant impact on the length of the post-anthesis period. Warming did not significantly alter the aboveground biomass production, but the grain yield was 16.3, 18.1 and 19.6% (P<0.05) higher in the AW, DW and NW plots than the non-warmed plot, respectively. Warming also significantly increased plant N uptake and total biomass N accumulation. However, warming significantly reduced grain N concentrations while increased N concentrations in the leaves and stems. Together, our results demonstrate differential impacts of warming on the depositions of grain starch and protein, highlighting the needs to further understand the mechanisms that underlie warming impacts on plant C and N metabolism in wheat.

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