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对南京地区小麦在自然条件下抗冻性的季节变化,以及在人工条件下温度对小麦脱锻炼的效应进行了初步的研究。结果表明,在南京地区,小麦接受锻炼,提高抗冻性的过程是很短暂的。在整个越冬阶段主要处于抗冻性的保持期。在这个时期,短期升温会使小麦抗冻性减弱,并且越到后期,这种效应越明显。乍暖还寒的短期温暖天气引起脱锻炼是造成本地区小麦冻害的主要危险。人工脱锻炼试验表明,脱锻炼在10℃以上于3—4天内即可完成。 在应用电导法测定小麦抗冻性时,本文对电解质透出率曲线配以logistic方程,并利用求拐点温度法来估计组织的半致死温度,并对该计算方法进行了讨论。
The seasonal variation of frost resistance of wheat in Nanjing under natural conditions as well as the effect of temperature on de-conditioning of wheat under artificial conditions were studied. The results show that in Nanjing, the process of wheat exercise to improve frost resistance is very short. Mainly in the maintenance of frost resistance throughout the winter. During this period, short-term warming will weaken the frost resistance of wheat, and the more obvious this effect is toward the later stages. Short-term, warm weather, which causes de-estrus, is a major danger to the freezing of wheat in the region. Artificial de-estrus test shows that de-exercise at 10 ℃ above in 3-4 days to complete. In the application of the conductivity method for the determination of wheat frost resistance, the electrolyte leakage rate curve with logistic equation, and the inflection point temperature method to estimate the tissue semi-lethal temperature, and the calculation method is discussed.