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首页> 外文期刊>Plant and Soil >Sharing N resources in the early growth of rapeseed intercropped with faba bean: does N transfer matter?
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Sharing N resources in the early growth of rapeseed intercropped with faba bean: does N transfer matter?

机译：在蚕豆和油菜套种的早期生长过程中共享氮资源：氮转移重要吗？

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摘要

Legume-brassica intercrops may help to reduce N fertilizer input. We tested whether (i) intercropping with faba bean can improve N status of rapeseed, and (ii) root complementarity and/or N transfer is involved in such performance. Pre-germinated rapeseed and faba bean were grown either together or in monospecific rhizotrons (2 plants per rhizotron). Root growth was recorded. N rhizodeposition of the crops and N transferred between species were assessed using a N-15 stem-labelling method. Intercropped rapeseeds accumulated 20 % higher amounts of N per plant than monocultures. Up to 32 days after sowing, root distribution in the rhizotrons was favourable to physical sharing of the soil N: 64 % of faba bean root length was located in the upper part, as 70 % was in the lower part for rapeseed. At late flowering of the faba bean (52 days after sowing), N rhizodeposition of the two crops were similar and reached 8 to 9 % of the plant N. N transferred from the faba bean to the rapeseed was similar to that transferred from the rapeseed to the faba bean. Niche complementarity benefits more intercropped rapeseed than net N fluxes between species in the early growth.
机译：豆科芸苔间作可能有助于减少氮肥的输入。我们测试了（i）与蚕豆间作是否可以改善油菜的N状况，并且（ii）根系互补和/或N转移与这种表现有关。将预发芽的油菜籽和蚕豆一起种植或在单特异性根瘤菌中生长（每个根瘤菌2株）。记录了根的生长。使用N-15茎标记法评估作物的N根状沉积和物种间转移的N。间作油菜的单株氮累积量比单株高20％。播种后长达32天，根际中的根部分布有利于土壤氮素的物理共享：蚕豆根长的64％位于上部，菜籽的下部占70％。在蚕豆开花后期（播种后52天），两种作物的氮根际沉积相似，达到了植物N的8％至9％。从蚕豆转移到油菜的氮与从油菜转移的氮相似。到蚕豆生态位互补性比早熟物种间的净氮通量更多地套种油菜。

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