裸燕麦根系体积与表面积的变化特征

以品五(晚熟品种)和坝莜一号(早熟品种)两个裸燕麦(莜麦)品种为试验材料,对其不同时期的根系体积和根系表面积的变化动态进行了研究。结果表明:裸燕麦两个品种中后期根系总体积的变化趋势基本一致,大致可分为:拔节期到抽穗开花期的快速增长阶段、抽穗开花期至开花后10~26 d的显著下降阶段、开花后10~26d至成熟期的缓慢上升阶段。通过对裸燕麦不同时期分层根系体积和表面积的分析,30~90 cm土层中根系的继续增长导致其生育后期根系表现回升性增长特性。裸燕麦晚熟品种生育中后期根系体积、根表面积、根系干重等性状间呈极显著正相关;早熟品种除根系干重与根系表面积之间相关不显著外,其他各性状之间均呈极显著正相关关系。

Characteristics of the variation of root volume and root surface area of naked oat

The variation of the root volume and root surface area at different growth stages was studied with two naked oat varieties,Pin-5 (late maturity) and Bayou-1(early maturity).The results showed that the changes of root volume of early and late maturity varieties were similar.It could be divided into three stages,including rapidly increasing stage(from jointing period to heading and flowering period),slowly declining stage(from heading and flowering period to grain filling period),and slowly rising stage(from grain filling period to mature period).Research on the root volume and root surface area of different soil layers showed that continued growth of root in 30～90 cm soil layer caused root surface area and root volume to increase slowly after grain filling.In the mid-late period of the late maturity of naked oats,there were extremely significant positive correlations between root volume,root surface area and root dry weight,etc.The traits of early maturity of naked oats displayed significant positive correlations except root dry and root surface area in the mid-late period.