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通过分析宁夏平罗西大滩不同改良年份盐碱地土壤养分含量,测定油葵(Helianthus annuus)光合日变化曲线、光响应曲线和油葵产量,研究了施用脱硫石膏对盐碱地土壤改良及油葵光合特性的影响.结果表明,在盐碱土壤上施用燃煤电厂脱硫石膏后,土壤电导率、pH值随土壤改良年限增加而逐年下降,土壤有机质含量、碱解氮、有效磷和速效钾则逐年上升.随着土壤改良年限增加,油葵叶片净光合速率、蒸腾速率、气孔导度、胞间二氧化碳浓度均明显下降,气孔限制值和水分利用效率也明显下降(P<0.01).同时,随着改良年限增加,油葵叶片暗呼吸速率、光饱和点和最大净光合速率增加,而光补偿点降低.施用脱硫石膏后油葵盘径、百粒重和产量随土壤改良年限增加也显著提高(P<0.05).因此,施用燃煤电厂脱硫石膏能够显著地改良盐碱地土壤、提高油葵叶片光合能力,从而促进作物生长、提高作物产量.图2表3参29
By analyzing the soil nutrient contents of saline-alkali soil in different improved years in Pingluosidan of Ningxia, the photosynthetic diurnal variation, light-response curve and sunflower yield of Helianthus annuus were determined. The effects of applying gypsum on soil salinization and photosynthesis .The results showed that after applying FGD gypsum in saline-alkali soil, the soil electrical conductivity and pH value decreased year by year with the increase of soil improvement years, and the contents of soil organic matter, available nitrogen, available phosphorus and available potassium increased year by year The net photosynthetic rate, transpiration rate, stomatal conductance and intercellular carbon dioxide concentration in oil sunflower leaves decreased significantly as the soil age improved, and the stomatal limitation and water use efficiency decreased significantly (P <0.01) The improvement of years increased the dark respiration rate, light saturation point and maximum net photosynthetic rate of oil sunflower leaves, but the light compensation point decreased.With the application of desulfurized gypsum, the oil pan diameter, 100-grain weight and yield of oil sunflower significantly increased with the improvement of soil age P <0.05). Therefore, the application of FGD gypsum in coal-fired power plants can significantly improve saline-alkali soil and improve the photosynthetic capacity of oil sunflower leaves, thus promoting crop Long, increase crop yields. FIG. 2 reference 29 Table 3