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在新疆墨玉县对不同水分条件下大田栽植的梭梭和多花柽柳苗期的净光合速率(Pn)、蒸腾速率(Tr)、水分利用效率(WUE)、气孔导度(Gs)和胞间CO2浓度(Ci)等光合生理指标进行了测定,同时测定了不同灌水量下梭梭和多花柽柳在不同时刻的叶片水势,以及两树种叶片的稳定碳同位素比率。结果表明:①梭梭和多花柽柳的水势在一天中的变化趋势呈“V”字型,不同处理下多花柽柳的水势日平均值略大于梭梭。②不同灌水量对梭梭和多花柽柳的水分利用效率影响不显著,在相同处理下,梭梭的水分利用效率总是大于多花柽柳。③梭梭的δ13C值为-12.65‰～-13.39‰,多花柽柳的δ13C值为-26.85‰～-27.70‰。梭梭的δ13C值显著大于多花柽柳(P<0.05),表明梭梭的长期水分利用效率较高。④运用隶属函数综合各个指标的比较结果来看,梭梭的抗旱性强于多花柽柳。
The net photosynthetic rate (Pn), transpiration rate (Tr), water use efficiency (WUE), stomatal conductance (Gs) and cell number of Haloxylon ammodendron and Haliotaxonplastic seedlings planted in field under different water conditions in Moyu County, CO2 concentration (Ci) and other photosynthetic physiological parameters were measured. The leaf water potential at different times and the stable carbon isotope ratio of Haloxylon ammodendron and Haliotis discus hannai at different irrigation levels were also measured. The results showed that: ① The trend of water potential of Haloxylon ammodendron and Tamarix ramosissima was “V” in one day. The daily average of water potential of Haliotis barbata was slightly larger than that of Haloxylon ammodendron under different treatments. (2) The water use efficiency of Haloxylon ammodendron and Haliotis discus hannai had no significant effect under different irrigation rates. Under the same treatment, the water use efficiency of Haloxylon ammodendron was always higher than that of Haliotis discus hannai. ③ The δ13C value of Haloxylon ammodendron is -12.65 ‰ ~ -13.39 ‰, and the δ13C value of Haliotis discus hannai is -26.85 ‰ -27.70 ‰. The δ13C value of Haloxylon ammodendron was significantly higher than that of Haloxylon ammodendron (P <0.05), indicating that Haloxylon ammodendron had long-term water use efficiency. ④ Use the membership function to compare the results of the various indicators, Haloxylon drought resistance is stronger than Tamarix.