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首页> 外文期刊>The Science of the Total Environment >Contrasting wheat phenological responses to climate change in global scale
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Contrasting wheat phenological responses to climate change in global scale

机译：对比全球气候变化的小麦鉴定性

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Comprehensive analysis of how wheat phenology responds to environmental factors in global scale is helpful for tackling the possible adverse effects of ongoing climate change on wheat production. In this study, six phenological parameters of global wheat, i.e., the growing season start (SGS), peak (PGS), end (EGS), length (LGS), as well as the vegetative period length (LVP) and reproductive period length (LRP), were retrieved from remote sensing data (1981-2014) by threshold-, logistic-, and shape-based methods. And then, we analyzed the effects of temperature, precipitation, short-wave (SW) radiation, and frost on spatiotemporal patterns of wheat phenology. In addition, haze impacts on wheat phenology were investigated in China and India where haze weather appears frequently in winter-spring seasons. Results showed that the occurrence time of SGS/PGS/EGS is gradually advanced from the pole to the equator and annual mean air temperature can explain 70% of their spatial variations. A dominant advanced SGS/PGS/EGS and a shortened LGS/LVP/LRP were detected in the study region due to the significant increase in temperature and SW radiation, as well as the decrease in frost days. Interannual fluctuations of SGS/PGS/EGS are primarily controlled by air temperature, while precipitation and frost only exerted some obvious impacts in some locations. Higher preseason temperature would induce an earlier wheat phenology and a shorter growing season, while adequate precipitation and frequent frost in preseason could delay the occurrence timing of wheat phenology and lead to a longer growing season. Besides, the decreased temperature resulted from severe haze weather may have partly counteracted the global-warming-induced advancing trend of wheat phenology in China, but further advanced the occurrence timing of wheat phenology through prompting vernalization in India. Overall, though wheat growth is largely constrained by human management, we still highlight the strong impacts of global climate change on wheat phenology. (c) 2019 Elsevier B.V. All rights reserved.
机译：对小麦候选如何应对全球规模环境因素的综合分析有助于解决持续的气候变化对小麦产量的可能不利影响。在本研究中，全球小麦的六个候参数，即生长季节开始（SGS），峰值（PGS），末端（EGS），长度（LGS）以及营养周期长度（LVP）和生殖时段长度（LRP）通过阈值，逻辑和基于形状的方法从遥感数据（1981-2014）检索。然后，我们分析了温度，沉淀，短波（SW）辐射和霜的影响，以及对小麦酚醛的时空模式的影响。此外，在中国和印度调查了对小麦候选的雾霾影响，其中冬季春季的阴霾天气常见。结果表明，SGS / PGS / EGS的发生时间从极点逐渐提出到赤道，每年平均空气温度可以解释其空间变化的70％。由于温度和SW辐射的显着增加，以及霜天数的显着增加，在研究区内检测到显着的高级SGS / PGS / PGS / EGS和缩短的LGS / LVP / LRP。 SGS / PGS / EGS的续际波动主要由空气温度控制，而降水和霜冻仅在某些位置施加了一些明显的影响。初期的季节性温度较高会诱使早期的小麦候选和较短的生长季节，而季前赛的充分降水和频繁的霜冻可能会延迟小麦候选的发生时间，并导致更长的生长季节。此外，由于严重的阴霾天气导致的温度降低可能部分地抵消了中国小麦候力的全球变暖诱导的推进趋势，而是通过在印度促使春化的春化来进一步推进小麦候选的发生时间。总体而言，尽管小麦增长在很大程度上受到人类管理的限制，但我们仍然突出了全球气候变化对小麦候选的强劲影响。 （c）2019 Elsevier B.v.保留所有权利。

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