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探讨了以叶片水势((?)_L)、气孔阻力(Rs)、蒸腾速率(Tr)作为果树水分亏缺指标的可行性.结果表明:黎明前(?)_L与上午10时左右的净光合速率(Pn)Tr以及果实直径、土壤水分含量明显相关;晴朗天气下,上午10时左右的Rs、Tr对水分亏缺反应明显,与(?)_L、Pn、果实直径增长、土壤含水量明显相关.三个指标较好地反映出与树体水分亏缺相联系的生理过程及土壤含水量,可作为评估树体水分状况适宜程度的良好指标.研究也证明:相同条件下,树体各部分三指标的大小不同,根据灌溉应满足树体水分竞争代谢“弱者”的原则,(?)L的取样部位应为树冠上部枝条的下位叶,而Rs、Tr则为内膛无果短梢叶.
The feasibility of water deficit index of leaf water potential ((?) _L), stomatal resistance (Rs) and transpiration rate (Tr) was discussed.The results showed that the net photosynthesis (Pn) Tr and fruit diameter and soil water content were significantly correlated. Under sunny weather, Rs and Tr at about 10 o’clock in the morning showed obvious responses to water deficit, with the increase of (?) _L, Pn, fruit diameter and soil water content The three indexes can well reflect the physiological process and soil water content associated with the water deficit of tree body, which can be used as a good index to evaluate the suitable degree of tree water condition.The research also proves that under the same conditions, Part of the three indicators of different sizes, according to the principle of irrigation should meet the tree water metabolism metabolism “weak”, (?) L sampling site should be the lower branches of the upper branches of the canopy, and Rs, Tr is the bore non-fruit short shoot leaf.