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首页> 外文期刊>Agronomy Journal >Diverse Responses of Winter Wheat Yield and Water Use to Climate Change and Variability on the Semiarid Loess Plateau in China
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Diverse Responses of Winter Wheat Yield and Water Use to Climate Change and Variability on the Semiarid Loess Plateau in China

机译：黄土高原半干旱区冬小麦产量和水分利用对气候变化和变异的响应。

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Crop production and water use in rainfed cropland are vulnerable to climate change. This study was to quantify diverse responses of winter wheat (Triticum aestivum L.) yield and water use to climate change on the Loess Plateau (LP) under different combinations of climatic variables. The crop model APSIM was validated against field experimental data and applied to calculate yield and water use at 18 sites on the LP during 1961 to 2010. The coefficient of variation of yield ranged from 12 to 66%, in which the vulnerability of yield increased from the southeast (12%) to the northwest (66%). This change was attributed to the gradual increase in precipitation variation from the southeast to the northwest. An obvious warming trend during 1961 to 2010 resulted in a significant decrease in the growth duration by 1 to 5 d decade(-1). The yield at 12 sites was significantly reduced by 120 to 720 kg ha(-1) decade(-1). Evapotranspiration was significantly decreased by 1 to 26 mm decade(-1); however, water use efficiency at most sites showed no significant trend. Eighteen sites were classified into three climatic zones by cluster analysis: high temperature-high precipitation-low radiation (HHL), medium temperature-medium precipitation-medium radiation (MMM), and low temperature-low precipitation-high radiation (LLH). The trend of decreasing yield was smallest in the HHL cluster because of a minimal reduction in precipitation, while decreasing trends in yield and evapotranspiration were larger in the LLH and MMM because of larger reductions in precipitation. The results imply that among strategies such as breeding for long duration or drought tolerance, modification of the planting date will be necessary to avoid high temperatures associated with climate change
机译：旱作农田的作物生产和用水易受气候变化的影响。这项研究旨在量化在不同气候变量组合下黄土高原（LP）上冬小麦（Triticum aestivum L.）产量和用水对气候变化的不同响应。对作物模型APSIM进行了田间试验数据验证，并用于计算1961年至2010年LP上18个站点的产量和用水量。产量变异系数在12％到66％之间，其中产量易损性从东南（12％）至西北（66％）。这种变化归因于从东南到西北的降水变化逐渐增加。 1961年至2010年期间的明显变暖趋势导致生长持续时间显着减少了1-5d十年（-1）。 12个站点的产量显着降低了120到720 kg ha（-1）·十年（-1）。蒸散量显着减少了1到26 mm十年（-1）;但是，大多数地点的用水效率没有显着趋势。通过聚类分析，将18个地点分为三个气候区：高温-高降水-低辐射（HHL），中温-中等降水-中辐射（MMM）和低温-低降水-高辐射（LLH）。在HHL集群中，由于降水量的最小减少，单产下降的趋势最小，而在LLH和​​MMM中，由于降水量的减少，单产和蒸散量的下降趋势更大。结果表明，在长期育种或耐旱等策略中，必须修改播种日期以避免与气候变化相关的高温

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