Actual impacts of global warming on winter wheat yield in Eastern Himalayas

文献类型： 外文期刊

第一作者： Zheng, Ch.

作者： Zheng, Ch.;Zhang, X.;Song, Zh.;Deng, A.;Zhang, B.;Zhang, W.;Chen, Ch.;Wang, L.;Mao, N.

作者机构：

关键词： Climate change;Food security;Free air temperature increase;Tibetan Plateau;Wheat cropping

期刊名称：INTERNATIONAL JOURNAL OF PLANT PRODUCTION （ 影响因子：2.017； 五年影响因子：1.85 ）

ISSN： 1735-6814

年卷期： 2016 年 10 卷 2 期

页码：

收录情况： SCI

摘要： Himalayas, are among the areas most vulnerable to global warming, however, little is known about warming impacts on the crops. Therefore, the actual affects of anticipated warming on winter wheat were tested in Tibet, China. During the period 1988-2012, Tibet region has experienced a large increase in daily mean, minimum and maximum temperatures during wheat growing seasons by 0.50, 0.67 and 0.51 degrees C every ten years, respectively. The de-trended wheat yield increased by 34.4 kg ha(-1) year(-1) during this period. According to the historical data, 1 degrees C increase in daily mean temperature could get 370.6 kg ha(-1) gain in wheat yield. Similar gains in wheat yield were found in a field warming experiment with an increase of 1.1 degrees C in daily mean temperature. The field warming caused a significant reduction in the pre-anthesis phase and entire growth period by 14 and 13 days, respectively. The green leaf areas and spike number in the warmed plots were significantly higher than that in non-warmed plots, while the grain number per spike was significantly lower in the former than the later (P<0.05). The main mechanism underlying the positive affects of this moderate warming on wheat yield is through improving plant development and growth during the pre-anthesis phase by mitigating the low temperature limitation. This study suggests that further efforts should be directed towards the improvement on agriculture infrastructure to utilize the positive affects of climatic warming on crop production.

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