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营养生长阶段受旱导致春小麦在正常分蘖抽穗停止后形成后生分蘖。后生分蘖的籽粒对总籽粒产量有显著贡献。后生分蘖较正常分蘖晚熟两周,推迟收获对收获满意的干燥状态造成困难。由于这个缘故,计算干旱敏感度时,在最后产量中分别计算含和不含后生分蘖的籽粒。如果只考虑正常分蘖的籽粒产量,分蘖到开始拔节期间的干旱敏感度最大,如果考虑正常加后生分蘖,则抽穗期间的干旱敏感度最大。不论采用那一个指标(相对籽粒产量,相对减产量与胁迫日数之比,用水效率或相对减产量对相对水分亏损之比)作为干旱敏感度来考虑时,以上这些结论都只对这一年和春小麦品种有效。
During the vegetative growth phase, the spring wheat regrowth tiller after normal tillering and heading stop. Post-tillering tillers contributed significantly to the total grain yield. Late tillers tiller late than normal two weeks, delayed harvest difficult to harvest satisfactory dry state. For this reason, in calculating the drought sensitivity, the grains with and without epigenetic tillers were calculated in the final yields, respectively. If we only consider the grain yield of normal tillers, the drought sensitivity during the tillering to the start of jointing is the highest, and the drought sensitivity at heading is the greatest if we consider the normal and the late tillering. Regardless of which of the following indicators (relative to grain yield, ratio of relative yield to stress days, ratio of water use efficiency or relative yield reduction to relative water loss) is used as a sensitivity to drought, these conclusions are only valid for the year and the year Spring wheat varieties effective.