摘要
采用桶栽方法,探讨了下层土壤容重对玉米根系生长及吸收活力的影响。结果表明,随着土壤容重的增加,玉米根条数、根干重、根长和根系活力都呈现减少的趋势,且容重越大,减少的趋势越显著。玉米总根量和气生根数量随着整个土层平均容重的增加而降低。受土壤容重影响,根系在不同土层之间的生长具有一定的补偿效应,但作用有限,不足以弥补下层容重过大对根系造成的不良影响。
A study on corn root growth and activities at different soil layers with special bulk density was conducted using pot cultivation in a field experiment. The results showed that corn root growth and activities were greatly affected by soil BD （bulk density） in deep soil layers. Corn root number, root dry matter, root length and root activities decreased with the increase of soil BD in deep soil layers. The larger the soil BD, the more significant the decrease. The amount of total corn root decreased with the increase of average soil BD. More air roots were observed in a smaller average soil BD. For Yuyu23, its root couldn＇t penetrate a length of 20 cm in soil layers with a soil BD of 1.6 g·cm^-3. It was found that root growth had certain compensative effect in soil layers with smaller soil BD, but such an effect was too limited to make up for the adverse effect caused by larger soil BD.
出处
《中国农业科学》
CAS
CSCD
北大核心
2005年第8期1706-1711,共6页
Scientia Agricultura Sinica
基金
河南省"九五"重点科技攻关项目(960201019)
