大豆不同群体叶面积指数及干物质积累与产量的关系

Studies on the Relationship between Yield and Leaf Area Index and Dry Matter Accumulation of Soybean with Different Population

以具有高产潜力的沧豆6号、冀豆16和冀豆17 3个大豆品种为试验材料,研究了15.0万株/hm2、19.5万株/hm2和24.0万株/hm23种种植密度下的叶面积指数及干物质积累动态与产量的关系。结果表明：各品种在不同群体条件下的叶面积指数变化趋势均大致呈抛物线型,沧豆6号在R6期叶面积指数与产量的相关性达极显著水平,冀豆16和冀豆17则呈显著负相关;不同种植密度、不同品种间的干物质积累动态均存在差异;沧豆6号在R1~R6期干物质积累量与产量呈显著正相关;在高种植密度下沧豆6号后期群体发育仍能维持较高的叶面积指数和干物质积累量,适合密植。

The relationship between yield and leaf area index （LAI） and dry matter accumulation of three soybean varieties （Cangdou No. 6, Jidou 16 and Jidou 17） with high yield potential with different planting density were studied. The results showed that the change trend of LAI of three soybean varieties with different planting density approximately followed the quadratic curve. There exited very significant correlation between LAI and yield of Cangdou No. 6, while there exited positive correlation between LAI and yield of Jidou 16 and Jidou 17 at R6. The dry matter accumulation of three varieties all existed difference with different planting density. The dry matter accumulation of Cangdou No. 6 was very significantly correlated with the yield from R1 to R6. The LAI and dry matter accumulation of Cangdou No. 6 were still maintained a high level with high planting density at the late development stage, which was suitable for dense planting.