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Assessing spatiotemporal characteristics of drought and its effects on climate-induced yield of maize in Northeast China

机译：评估干旱的时空特征及其对中国东北玉米玉米产量的影响

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摘要

It is important to investigate the potential impacts of global climate change on crop yield especially there have been limited relevant studies conducted in the cold regions such as Northeast China. This study investigated the spatiotemporal characteristics of droughts on different growth stages of maize over Northeast China during 1960-2016 and the effects of droughts on the climate-induced yield of maize separated by the logistic regression model using standardized precipitation evapotranspiration index (SPEI), trend analysis methods, rotated empirical orthogonal function, wavelet method, and Hurst exponent. The results indicated that 1) the spatiotemporal patterns of drought were identified at different growth stages and the changes in dryness/wetness condition presented significant periodic oscillation on different time scales. 2) The patterns of dryness/wetness conditions and the changing characteristics of each sub-region at the early growth (EG) and middle growth (MG) stages were similar. 3) The future drought trends in most stations would be consistent with the past trends. In addition to the wetting trend in the eastern and southern parts at the EG stage, the whole study area would show a drying trend in future at other growth stages. 4) The cross wavelet transform (XWT) was used to develop the changing relationships between climate-induced yield of maize and the dryness/wetness condition at different growth stages with obvious inter-annual periodicities. 5) For Northeast China, climatic factors that can affect the climate-induced yield of maize are firstly temperature, next precipitation, and thirdly dryness/wetness conditions.
机译：重要的是要调查全球气候变化对作物产量的潜在影响，特别是在中国东北等寒冷地区进行了有限的相关研究。本研究在1960至2016年调查了玉米在中国东北地区的不同生长阶段的干旱的时空特征及对玉米的气候变化导致的干旱产量的影响，采用标准化降水指数蒸散量（SPEI）分离通过逻辑回归模型，趋势分析方法，旋转经验正交函数，小波法和赫斯特指数。结果表明，1）在不同的生长阶段鉴定了干旱的时空模式，干燥/湿度条件的变化在不同的时间尺度上呈现了显着的周期性振荡。 2）干燥/湿度条件的模式和每种亚区域的改变特性在早期生长（例如）和中间生长（Mg）阶段是相似的。 3）大多数站点的未来干旱趋势将与过去的趋势一致。除了在EG阶段的东部和南部零部件的润湿趋势外，整个研究领域还将在其他增长阶段显示未来的干燥趋势。 4）交叉小波变换（XWT）用于在不同生长阶段的气候诱导的玉米和干燥/湿度条件下产生变化的关系，以明显的年度周期性。 5）对于东北地区，可能影响气候诱导的玉米产量的气候因素首先是温度，下一个沉淀和第三干燥/润湿条件。

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  • 来源
    《Journal of Hydrology》 |2020年第1期|共14页
  • 作者

    Zhou Zhaoqiang; Shi Haiyun; Fu Qiang; Li Tianxiao; Gan Thian Yew; Liu Suning;

  • 作者单位

    Southern Univ Sci &

    Technol Sch Environm Sci &

    Engn State Environm Protect Key Lab Integrated Surface Shenzhen Peoples R China;

    Southern Univ Sci &

    Technol Sch Environm Sci &

    Engn State Environm Protect Key Lab Integrated Surface Shenzhen Peoples R China;

    Northeast Agr Univ Sch Water Conservancy &

    Civil Engn Harbin Peoples R China;

    Northeast Agr Univ Sch Water Conservancy &

    Civil Engn Harbin Peoples R China;

    Southern Univ Sci &

    Technol Sch Environm Sci &

    Engn State Environm Protect Key Lab Integrated Surface Shenzhen Peoples R China;

    Southern Univ Sci &

    Technol Sch Environm Sci &

    Engn State Environm Protect Key Lab Integrated Surface Shenzhen Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水文科学（水界物理学）;
  • 关键词

    Drought characteristics; Climate-induced yield of maize; Wavelet method; Northeast China;

    机译：干旱特征;气候诱导的玉米产量;小波法;东北;

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