论文部分内容阅读
1 气候因素影响1.1 高温干旱影响拔节期到抽穗期是玉米旺盛生长期,茎叶增长速度快、增长量大,雌雄幼穗不断分化形成,需水量很大。抽穗开花期是需水临界期,需水量达到高峰,对水分的反应最敏感。灌浆期需要水为介质运输营养物质,需水量也较大。从拔节到灌浆期干旱会扰乱植株的正常生理代谢过程,使光合作用受抑制,合成产物量减少,而呼吸作用增强,加速物质的分解,消耗大于积累,造成营养缺乏。干旱导致萎蔫也会造
1 climatic factors affect the impact of 1.1 high temperature and drought impact of jointing to heading stage is the vigorous growth of corn, stems and leaves grow faster, the growth of large, male and female spike continued differentiation, the water demand is large. Flowering stage is the critical stage of water demand, water demand peaked, the most sensitive to water reactions. During the filling period, water is needed to transport nutrients for the medium, and the water requirement is also large. Drought from jointing to filling stage can disrupt the normal physiological metabolic process of plants, inhibit photosynthesis, reduce the amount of synthetic products, and enhance the respiration, accelerate the decomposition of substances, the consumption is greater than the accumulation, resulting in nutritional deficiencies. Droughts lead to wilting too