A split-plot experiment was conducted to alleviate high yield and strong lodging resistance not coinciding with rapeseed (Brassica napus L.). The main plot was planting density (1.2 and 4.5 × 10⁵ plants ha⁻¹), and the subplots were different intercropping ratios (1:0, 0:1, 2:1, 1:1, and 1:2) of Huayouza 62 (lodging resistance) and Fengyou 520 (lodging sensitive). Our results indicated that increased density significantly decreased biomass, siliques, and yield per plant, but the population yield was enhanced by 9.3%, and intercropping increased leaf area at the bolting and anthesis, dry matter accumulation, and population yield compared to the sole crop. Increased density decreased the root neck diameter and stem breaking strength of per plant but increased the population lodging resistance, and intercropping significantly improved lodging-related agronomy traits, increased stem breaking strength, and stem biochemical contents compared to sole cropping. The average lodging index was decreased by 17.7% and lodging angle by 11.2% at the planting density of 1.2 × 10⁵ plants ha⁻¹ deployed at 1:2 intercropping ratio, and at 4.5 × 10⁵ plants ha⁻¹ with 1:1 intercropping ratio, the average lodging index decreased 7.8% and the lodging angle by 14.1%. Total population root biomass was significantly negatively correlated with the lodging angle, but positively correlated with the harvest yield. Intercropping rapeseed varieties that differ in lodging resistance at variable density can improve the root traits of the population that alleviate the trade-off between high yield and poor lodging resistance.

中文翻译：

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种植密度和品种间作改善油菜器官生物量分布以缓解产量和抗倒伏性之间的权衡

进行了裂区试验，以减轻与油菜（Brassica napus L.）不同的高产和抗倒伏性强。主要地块是种植密度（1.2 和 4.5 × 10 ⁵植物 ha ^-1)，花油杂62(抗倒伏)和丰油520(抗倒伏)的间作比例不同(1:0、0:1、2:1、1:1、1:2)。我们的结果表明，与单一作物相比，密度增加显着降低了生物量、长角果和单株产量，但种群产量提高了 9.3%，间作增加了抽薹和开花时的叶面积、干物质积累和种群产量. 密度的增加降低了单株的根颈直径和茎的断裂强度，但增加了种群的抗倒伏性，与单作相比，间作显着改善了与倒伏相关的农艺性状，增加了茎的断裂强度和茎生化含量。平均倒伏指数下降17.7%，倒伏角下降11。⁵株ha ^-1 1:2间作，4.5×10 ⁵株ha ^-1 1:1间作，平均倒伏指数下降7.8%，倒伏角下降14.1%。总种群根生物量与倒伏角呈显着负相关，与收获产量呈正相关。在不同密度下间作抗倒伏性不同的油菜品种可以改善种群的根系性状，从而缓解高产与抗倒伏性差之间的权衡。