灌水频率对河西走廊绿洲菊芋生活史对策及产量形成的影响

灌水频率对作物产量形成和生活史对策具有重要影响,但对于收获地下块茎的经济作物的研究非常少见。以菊芋为材料,分别在苗期(seedling, S)、枝繁叶茂期(lush foliage, L)、现蕾期(budding, B)和开花期(flowering, F)施加不同灌水组合,包括苗期600m³/hm² (S600,相当于天然降雨量)处理组J1、S600+L600为J2、S600+B600为J3、S600+L300+B900为J4、S600+L900+B300为J5、S600+L600+B300+F900为J6以及全生育期不浇水的对照组CK,测定菊芋产量及生物量分配变化。结果表明,低灌水频率显著降低菊芋产量和干物质积累,苗期到枝繁叶茂期是株高增长速度最快的时期,到枝繁叶茂期之后显著性下降,表明枝繁叶茂期是营养生长的高峰期。不同灌水频率处理组之间菊芋产量和干物质积累量有显著性差异,表现为J1

Effect of irrigationfrequency on life history strategy and yield formation in Jerusalem artichoke(Helianthus tuberosus.L) in oasis of Hexi Corridor

Irrigation frequency influences crop yield formation and life history strategy, but little research has done on underground tuber harvested economic crops. Jerusalem artichoke yield and biomass distribution dynamics were determined in different water application compounding treatments with the irrigation time at seedling (S), lush foliage (L), budding (B), and flowering (L) stages, respectively. The treatments were J1, in which crops were watered 600mm at seedling stage (S600, equal to natural rainfall), J2 (S600+L600), J3 (S600+B600), J4 (S600+L300+B900), J5 (S600+L900+B300), J6 (S600+L600+B300+F900) and CK, in which crops were never watered. The result indicated that low irrigation frequency significantly decreased Jerusalem artichoke yield and dry matter accumulation. Plant height was increased the fastest from seedling to lush foliage but significantly decreased after lush foliage, which implied that lush foliage was the fastest nutrition growth period for Jerusalem artichoke. There were significant differences in Jerusalem artichoke yield and dry matter accumulation among different irrigation treatments, with the order as J1