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以7年生库尔勒香梨为试材,设置不同根区灌溉方式,研究了果实不同发育时期土壤水分对香梨枝水势的影响。结果表明:调亏灌溉下,果实发育不同阶段库尔勒香梨枝水势的日变化均呈“V”字形,在14:00-16:00达到最低值;不同生育时期受干旱胁迫的香梨树枝水势明显低于正常灌溉的香梨枝水势;无论在干旱胁迫还是正常灌溉下香梨枝水势在开花期的日变化最为平缓,早晚枝水势基本一致,在坐果期和成熟期的枝水势日变化有一定的起伏,早晚水势差较小,而在果实膨大期的枝水势日变化起伏较大,早晚的水势差也较大。试验条件下不同生育期库尔勒香梨枝水势与土壤含水量呈正相关关系,通过回归分析建立了不同生育期二者的函数关系,并确定了不同生育期阶段适宜香梨树生长的枝水势和土壤含水量的低限值范围。
Taking 7-year-old Korla fragrant pear as test material, different irrigation methods were set up to study the effect of soil moisture on the water potential of pear under different developmental stages. The results showed that the diurnal variation of water potential of Korla fragrant pear branches showed “V” shape at different stages of fruit development under the condition of regulated deficit irrigation, reached the lowest value at 14: 00-16: 00; the branch of pear under different drought stress The water potential was significantly lower than that of the normal irrigated pear. The diurnal variation of the water potential at the flowering stage of the pear under both drought stress and normal irrigation was the most gentle, and the morning and evening water potential was basically the same. The diurnal variation of the branch water potential at the fruit setting and mature stages was certain Of the ups and downs, sooner or later, the water potential difference is smaller, and in the fruit enlargement of the branch water potential fluctuations in the larger, sooner or later the water potential difference is larger. Under the experimental conditions, the water potential of pear and branch of Korla at different growth stages had a positive correlation with soil water content, and the function relationship between different growth stages was established by regression analysis. The branch water potential and the soil content suitable for pear growth at different growth stages Lower limit of water volume.