小麦开花后根系衰退及分布规律的初步研究

Primary Study on Wheat Root System Growth, Development and Distribution of Later Season

在根系地下观测室的根系生长观测箱中，对小麦根系的立体分布和开花后的衰退规律进行了观察研究。结果表明，在开花期根系生长量达到高峰后，呈直线下降趋势；开花后根系在不同层次土壤剖面分布主要在６０～１２０ｃｍ；根系的衰退区主要在３０～６０ｃｍ，５月１１日～２１日衰退速度最快。

The growth and development of root system is one of major factors to effect wheat grain production. Observing wheat root growth and distribution on soil profiles by application of underground root observation boxes to define root system growth and development after wheat flowering has very important meaning for understanding formation of wheat yield and quality. The result of this study shows that the amount of root growth reaches its peak during wheat flowering stage, then, decreases on a linear trend. The distribution of root system on the soil profiles after wheat flowering is mainly within 60 120cm soil layers. Major root decrease zone is within 30-60cm, and has fastest speed during the day of 11/5 to 12/5.