冬小麦根系分布规律

Distribution pattern of winter wheat root system

根据在郑州进行的冬小麦根系田间实测资料,研究了根长密度和根质量密度在砂壤土中的垂直分布。结果表明:冬小麦根量主要集中在上层,根长密度、根质量密度在0～50cm土层内分别占57.7%和66.7%,而在50～100cm层分别占23.4%和18.7%,根长密度和根质量密度随土壤深度的变化均符合指数函数形式;综合考虑根量分布、根系吸水等因素,确定了冬小麦适宜的底墒深度为100cm。

Based on the measured data from the winter wheat fields in Zhengzhou of Henan Province, the vertical distribution of root length density （RLD） and root mass density （RMD） were analyzed. The results showed that the roots of winter wheat were centralized in upper soil layer. At the depth of 0-50 cm, the RLD and RMD occupied 57.7% and 66.7% of the total; while at 50-100 cm, they were 23.4% and 18.7%, respectively. The variation of RLD and RMD with soil depth accorded with exponential function. Considering of the root distribution and its water absorption, the feasible depth of soil available water at planting for winter wheat in Zhengzhou was 100 cm.