【摘要】 田间试验表明 ,旱地冬小麦根系集中分布在 0～ 2 0 cm土层中 ,约占 0～ 6 0 cm土层总根重的 6 0 .7% ;根系生育规律以根重变化表示在 0～ 2 0 cm土层中 ,呈逆变态 ,表现为快、较慢、慢的生长过程 ,2 0～ 4 0 cm土层呈突变态、较慢、快、慢的生长过程 ,4 0～ 6 0 cm土层呈稳定状态 ,表现为慢、快、慢的生长过程。不同肥料处理对冬小麦根系的影响是 :氮肥有增加表层根系的作用 ,平均日增加 4 .0 5 g/ cm2 ,影响深度达 4 0 cm ;磷肥利于根系下扎 ,可达 80cm土层以下 ;氮磷有机肥并施显著增加根重和生长量 ,有利于吸收深层水分和养分 ;旱地冬小麦根系下扎深度为2 2 0～ 2 4 0 cm,吸收利用土壤水分能力范围在 180～ 2 10 cm。更多还原

【Abstract】 Field experiment showed that winter wheat roots in dryland mainly distributed in 0~20 cm soil depth,which was about 60.7% of the total root weight in 0~60 cm soil depth.When the growth law were measured with root weight,adversely change would be observed in 0~20 cm soil depth,abrupt change in 20~40 cm,and stable change in 40~60 cm.Effect of different fertilizers on winter wheat roots were:Nitrogen fertilizer could increase root growth in top soil, in which root weight increasing rate was 4.05 g/(cm 2·d) and in 40 cm soil depth, this effect still be observed. Phosphate fertilizer made root grown in the more deep soil depth,even at 80 cm.The combination of N, P, and manure could increase root weight and root biomass;as a result, the root uptake soil moisture and nutrient in deep soil more easily. In dryland, winter wheat root could distribute in 220~240 cm,and soil moisture in 180-210 cm be used.更多还原