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根据开花期、分蘖期和叶片早期生长等特征选用供试小麦。所有供试材料均裁培于温室里1米长的栽培管中,实验在两个季节进行,每一季节都进行四种干旱处理。处理和栽培的条件与大田作物相同。研究发现,籽粒产量与植株的生长及开花前后土壤水分多少有关。在较湿润的处理中,作物花期前供水充足,花期后干旱(类似于一种潮湿的地中海型环境),作物籽粒产量与开花前的生长量有关;而在较干旱处理中,花前干旱,作物叶面积指数下降,相对耗水量小,为花后生长节余了水分,因而收获指数和籽粒产量较高。然而,开花前生长也是很重要的,在最干旱的处理中,籽粒干物质重的60%来源于开花时已积累的物质,此值约占开花时地上部分生物量的15%。收获指数(y)与开花后耗水量(x)呈非线性相关关系,即 y=0.10+0.13 ln(x),r~2=0.82(P<0.01)。
The test wheat was selected according to the characteristics of flowering period, tillering stage and early leaf growth. All the tested materials were cut in a 1-meter-long cultivation tube in a greenhouse. Experiments were conducted in two seasons, and four kinds of drought treatments were conducted every season. The conditions for processing and cultivation are the same as for field crops. The study found that grain yield and plant growth and flowering before and after the soil moisture content. In more humid treatments, there was sufficient water supply before florescence and drought after florescence (similar to a humid Mediterranean environment). The grain yield of the crop was related to the growth before flowering. In the more arid treatments, Crop leaf area index decreased, the relative water consumption is small, post-anthesis to save the water, so the harvest index and grain yield higher. However, pre-bloom growth is also important. In the driest treatment, 60% of the dry weight of the grain is derived from the accumulated material at flowering, which accounts for about 15% of the aerial part of flowering. There was a non-linear relationship between harvest index (y) and water consumption after flowering (x), ie, y = 0.10 + 0.13 ln (x) and r ~ 2 = 0.82 (P <0.01).