作物学报 ›› 2019, Vol. 45 ›› Issue (5): 755-763.doi: 10.3724/SP.J.1006.2019.84084
史文卿1,张彬彬1,柳洪鹃1,赵庆鑫2,史春余1,*(),王新建1,司成成1
Wen-Qing SHI1,Bin-Bin ZHANG1,Hong-Juan LIU1,Qing-Xin ZHAO2,Chun-Yu SHI1,*(),Xin-Jian WANG1,Cheng-Cheng SI1
摘要:
为探讨甘薯块根形成和膨大对土壤紧实度的响应机制及与产量的关系, 以源库特征差异显著的食用型甘薯品种“北京553”和“龙薯9号”为试验材料, 设置不同的土壤紧实度处理, 研究土壤紧实度调控甘薯块根产量的生理生态原因。结果表明, 降低土壤紧实度, 全生育期耕作层土壤的非毛管孔隙度显著提高。在块根形成期(20~40 d), 随土壤紧实度降低, 耕作层土壤的最高温度提高、最低温度降低, 温度日较差显著提高。在甘薯块根膨大期(45~165 d), 与对照相比, 疏松处理可以提高块根中蔗糖合酶(SS)和腺苷二磷酸葡萄糖焦磷酸化酶(ADPGPPase)活性, 增加淀粉含量; 提高块根中干物质积累初始势、干物质积累速率和功能叶 13C同化物在块根中的分配比例。在收获时, 疏松处理显著提高单薯重和收获指数, 北京553和龙薯9号分别增产20.01%~24.25%和21.64%~27.78%。
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