作物学报 ›› 2015, Vol. 41 ›› Issue (11): 1740-1747.doi: 10.3724/SP.J.1006.2015.01740
吴雨珊1,龚万灼1,廖敦平2,武晓玲1,杨峰1,刘卫国1,雍太文1,杨文钰1
WU Yu-Shan1,GONG Wan-Zhuo1,LIAO Dun-Ping2,WU Xiao-Ling1,YANG Feng1,LIU Wei-Guo1,YONG Tai-Wen1,YANG Wen-Yu1,
摘要:
选取我国南方套作模式下20个不同产量水平的大豆品种(系),于2013—2014年采用净作和遮荫(遮阳网或玉米)对比分析了高产和低产大豆品种在荫蔽期及复光期的生长特点。结果表明,荫蔽期间,茎叶干物重显著低于净作,分配规律表现为“茎多叶少”,分别为58.4%和41.6%;与高产类型大豆相比,低产类型茎叶干重下降比例、茎长、茎长/茎粗、茎长/地上部干物质、茎长/叶面积显著增加;荫蔽期地上部干物质与产量呈显著正相关,茎干物质比例与产量呈显著负相关。光照恢复后,地上部干物质迅速增加,分配规律表现为“茎少叶多”,复光后30 d分别为47.7%和52.3%;高产类型地上部干物质、叶面积、叶干重比例、茎粗均显著大于低产类型,茎长/茎粗、茎长/地上部干物质、茎长/叶面积均显著小于低产类型;地上部干物质、叶面积、茎粗、叶干物质比例与产量呈显著正相关,茎长/茎粗、茎长/地上部干物质、茎长/叶面积与产量呈极显著负相关。通过复光前后生长性状与产量的回归分析,复光后30 d的叶干物质比例、茎长/地上部干物质、茎粗可作为预测套作大豆产量的主要指标。上述结果表明,选择荫蔽期茎长较短、地上部干物质较大、叶面积更大,光照恢复期茎粗较大、叶干物质比例较大、茎长/地上部干物质较小的大豆品种可以在套作下获得高产。
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