不同种植密度下春玉米干物质积累、分配和转移规律研究

The Effect of Plant Density on Regularity of Accumulation,Distribution and Transfer of Dry Matter on Spring Maize

2005年在河北科技师范学院农学试验站进行试验,研究不同种植密度下春玉米干物质的积累、分配和转移规律。试验设5个密度水平,分别为2.25万、4.5万、6.75万、9万、11.25万株/hm2。研究表明:春玉米在个体和群体层次上干物质积累均呈S型动态,各器官干物质积累呈单峰曲线动态;种植密度与器官、个体干物质积累量呈负相关,与群体干物质积累量呈正相关;种植密度对干物质积累的影响主要体现在拔节后;干物质在各器官中的分配,在灌浆前不受密度影响,灌浆后随密度加大,营养器官所占比重加大,雌穗所占比重下降。随密度增加,茎鞘中干物质向子粒中转移的转移率和贡献率有增加的趋势,而叶片中则有降低的趋势。

To study the effect of plant density on regularity of accumulation, distribution and transfer of dry matter on spring maize, the experiment was conducted in agronomy experimental station in Hebei Normal University of Science ＆ Technology in 2005. There were five density levels. The results was that the dynamics of dry matter accumulation of single plant and population showed S curve, and the dynamics of dry matter accumulation of the organ showed single peak curve. The effect of plant density on dry matter was more and more after elongating stage, the difference a- mong all treatments was the biggest at the mature stage. Before grouting stage, the distribution of dry matter in organ was not affected by plant density, but the ratio of dry matter in vegetable organ was increased, and that of the ear was reduced when plant density was increased after grouting stage. The ratio of transfer and contribution of dry matter in stem and sheath was increased when plant density was increased, but that of leaf was contrary.