为筛选适合套作的大豆品种提供相应的生物力学性能指标,以耐阴型品种‘南豆12’和不耐阴型品种‘C103’为试验材料,在玉米-大豆套作和大豆单作两种种植模式下,进行了不同品种的节间惯性矩、弹性模量、抗弯刚度等力学指标的测定和相应变化规律的研究.结果表明:在套作模式下,两个品种的惯性矩明显小于单作模式,而弹性模量明显大于单作模式.‘C103’在单作模式下茎秆的抗弯刚度明显大于套作模式,而‘南豆12’在两种种植模式下茎秆的抗弯刚度差异不大.在两种种植模式下,两个品种的弹性模量和抗弯刚度均为第一节间最大,且由低位节向高位节递减,可以作为筛选耐阴型品种的生物力学指标.%To provide the corresponding biomechanical indexes for the selection of soybean varieties suitable for intercropping,taking the shade tolerant soybean'Nandou 12'and the shade intolerant soybean'C103'as materials,the mechanical indexes such as internode inertia moment,elastic modulus,bending rigidity of the 2 soybean varieties were measured and the law of corresponding change were studied under maize-soybean intercropping mode and soybean monoculture mode.The results showed that under intercropping mode,the inertia moment of the 2 soybean varieties was less than that of monoculture mode obviously,while the elastic modulus was obviously higher than that of monoculture mode.Under monoculture mode,the stem bending rigidity of'C103'was significantly higher than that of intercropping mode,and there was little difference in the stem bending rigidity of 'Nandou 12'in the two planting modes.Under two planting modes,the elastic modulus and bending rigidity of the 2 soybean varieties were the largest in the first internodes,and decreased from the low node to the high node,which could be used as a biomechanical index for screening shade tolerant soybean varieties.
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