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以晚熟稀植品种丹玉39和中晚熟密植品种郑单958为试材,通过5年的定点栽培试验,对玉米群体结构与年际间气象因子变化的关系进行研究。结果表明:玉米群体结构对年际间气象因子变化的反应不同,并导致不同年份的适宜密度和适宜密度范围发生变化,最终对产量造成影响。降水量及时间分布是影响群体结构的最主要因子,其次为日照时数。受影响最大的是叶面积指数,其次依次为叶向值、株高、透光率。6月下旬的降水量对LAI影响较大;7月上旬日照时数与叶向值密切相关;株高形成期的降水量是影响株高变化的根本原因。
The late maturing rare plant Dan Yu 39 and the late maturing close planting Zhengdan 958 were used as materials to study the relationship between the population structure of maize and the change of meteorological factors during the interim. The results showed that the population structure of maize responded differently to the change of meteorological factors during the year, and resulted in the change of appropriate density and suitable density range in different years, which eventually affected the yield. Precipitation and time distribution are the most important factors affecting the population structure, followed by sunshine hours. The most affected area is leaf area index, followed by leaf direction, plant height and light transmittance. Precipitation in late June had a greater impact on LAI; sunshine hours in early July was closely related to leaf value; and precipitation at the height of plant height was the root cause of plant height variation.