密度调控对半干旱区不同株型玉米品种冠层和产量指标的影响
以平展型玉米品种（吉单535）和紧凑型玉米品种（先玉335、利民33和郑单958）为材料，2012年至2013年在吉林省西部半干旱区的洮南市研究了密度调控对不同类型玉米品种干旱胁迫条件下的冠层和产量指标的影响。结果表明：在两年玉米灌浆期均出现中度干旱的条件下，不同类型玉米品种的种植密度和叶面积指数、消光系数均呈显著的直线回归关系，而密度和群体生长速度、果穗生长速度和产量则呈先上升后下降的单峰曲线关系。通过回归方程计算，平展型和紧凑型品种的最佳种植密度分别是5.4和6.3万株/公顷。紧凑型品种的平均群体生长速度和穗生长速度，相对于平展型品种，可以在更高的种植密度条件下达到峰值。这些结果说明紧凑型品种，在协调个体与群体适应性方面强于平展型品种，并且更容易适应干旱环境。
英文摘要:
The effect of planting density regulation on canopy and yield components of maize varieties of different types in drought stress was studied from 2012 to 2013 in Taonan City, where located on semi-arid region of west of Jilin province, by using Flat-type maize variety (Jidan535) and compact maize varieties (Xianyu335, Limin33 and Zhengdan958). The results showed that in the condition of moderate drought appearance during grain filling stage in both of two years, the relationship of planting density of maize varieties of different types and leaf area index as well as extinction coefficient was significant linear-regression relationship, however, planting density and speed of population and cluster growth as well as yield showed single curve relationship which was a trend of rise first then fall. The best planting densities of flat-type and compact maize varieties, which was calculated via regulation equation, was 54000 and 63000 per hectare, respectively.The average speed of population and cluster growth in flat-type maize variety, compared with compact variety, could reached a peak under higher planting density. These results revealed that flat-type variety was better than compact variety on adaption of single to population, and easier to adapt arid environment.
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