不同禾豆间作复合群体根系的时空分布特征

通过土柱栽培试验,研究了小麦间作菜豆、小麦间作蚕豆及不同单作作物根系的时空分布特征。结果表明,小麦间作菜豆的总根干重在小麦苗期、开花期、灌浆期、成熟期与对照相比增减了50.80%、2.42%、31.94%、-4.83%,小麦间作蚕豆根干重的增减幅度分别为-6.82%、7.26%、14.66%和-7.25%。小麦间作菜豆和小麦间作蚕豆全生育期根干重按生育进程呈明显分移特性。两作生长前期,间作作物根系空间分布范围大于单作;生长后期,间作作物根系分布在0~50 cm的土层中,单作主要分布在0~70 cm的范围内。小麦间作蚕豆的总根重在全生育期呈小-大-小-大的双峰变动趋势;小麦间作菜豆根重变化趋势与单作相同,呈以生长盛期为峰值的单峰型。间作作物成熟期深层根系含水量高于单作。

Research on Root Temporal and Spacial Distribution of Intercropped Cereal and Legume Crops

A soil column culture experiment was carried out in this study to investigate the root distribution characteristics of intercropped crops.The result showed that,in the wheat seedling stage,bloom stage,filling stage and mature stage,the dry root weight of wheat kidney-bean intercropping(IWK) is improved by 50.82%,2.42%,31.94% and-4.83% compare to the mono cropping respectively,and that of the wheat broad-bean intercropping(IWB) is improved by-6.82%,7.26%,14.66% and-7.25% correspondly.In the whole growth stage,the root weight of IWK and IWB mainly distributed in deeper soil layer in the earlier growth stage,but reversed in the latter growth stage.In the seedling period and bloom period,the root distribution range of IWK and IWB are broader than monoculture.In the filling stage and mature stage,the root of monoculture mainly distribute in 0~50cm soil layer,but the root of intercropping mainly distribute in 0~70cm soil layer.In the whole growth stage,the dry root weight of the IWB dynamic shown as a dual-peaked,but that of the other cropping patterns shown as a mono-peaked one.The root moisture content of the intercropping is higher than that of the mono cropping in deeper soil layer.