根系不同分隔方式下油菜和鹰嘴豆对小麦锰营养的影响

通过根系分隔盆栽试验,研究了油菜和鹰嘴豆对小麦生长及锰营养的影响.结果表明:与油菜或鹰嘴豆混作能显著改善小麦生长及锰营养,其地上部干质量和吸收锰量均以根系不分隔处理显著高于根系完全分隔处理,但油菜和鹰嘴豆的生长受小麦抑制,表现为不分隔处理地上部干质量及吸锰量显著低于完全分隔.不施锰小麦/油菜和小麦/鹰嘴豆混作体系中,根系不分隔处理小麦根区土壤DTPA-Mn含量显著高于其他分隔方式,且油菜或鹰嘴豆地上部植株锰含量显著高于相应的混作小麦,在锰胁迫条件下,油菜和鹰嘴豆根系活化的土壤锰可被小麦吸收利用.因此与油菜或鹰嘴豆混作是改善小麦锰营养的有效途径之一.

Effects of Rapeseed and Chickpea on Mn Nutrition of Wheat under Different Root Barrier Patterns

A pot experiment was conducted to investigate the effects of rapeseed and chickpea on the growth and Mn nutrition of wheat in intercropping systems under different root barriers pattern. Results show that both shoot growth and Mn nutrition of wheat were significantly improved in wheat/rapeseed or in wheat/chickpea intercropping system.The shoot dry weight and Mn uptake by wheat in the mixed-cropping without barrier were significantly higher than those in the mono-cropping where root was constricted by the solid barrier.But the growth of rapeseed and chickpea were restrained by wheat in the mixed cropping system.Results also show that soil DTPA-Mn concentration of wheat root area in no barrier treatment was markedly higher than that in the mesh barrier or solid barrier treatment in the wheat/rapeseed,wheat/chickpea intercropping systems receiving nil mg/kg Mn,and shoot Mn concentration of rapeseed,chickpea were significantly higher than their respective wheat,Mn which activated by rapeseed or chickpea was utilized by wheat in the mixed cropping system when soil was lack of Mn. Those indicated that Mn nutrition in the mixed cropping wheat was significantly improved by rapeseed or chickpea.