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本研究采用Li-6400型光合测定仪对N、P、K肥料处理下蓝蓟的光合特性指标进行测定和分析,了解其光合特性日变化的规律.结果表明:在N、P、K处理下蓝蓟光合日变化曲线发生变化,N、P单峰曲线,K双峰曲线,3种肥料处理光合速率最大值为K处理下的净光合速率呈现双峰曲线最大值22.364μmol(CO2)/(m2·s)出现在上午10:00;光合速率与光合特性参数相关性表现为均不呈显著性,而光合特性参数之间却呈极显著相关.说明光合速率日变化受其光合特性参数综合因素的影响.K素通过影响胞间CO2浓度(Ci)而导致光合速率日变化出现双峰曲线,通过方差分析得知K素方差最小(4.14)和极值最小(2.51).N、P肥料不出现光合午休可能对蓝蓟高产栽培技术提供理论支撑.“,”The photosynthetic characteristics of Echium vulgare under different N, P and K fertilizer treatments were measured and analyzed by using Li-6400 type photosynthetic apparatus to understand the regularity of diurnal variation of photosynthetic characteristics of Echium vulgare. The result showed that photosynthetic diurnal variation curve of Echium vulgare changed under different N, P and K treatments. N and P were single peak curve, but K was a bimodal curve. The maximum photosynthetic rate of the three fertilizer treatments was K, and its maximum of bimodal curve of the net photosynthetic rate was 22. 364 μmol(CO2)/(m2·s) at 10:00 am. The correlation between photosynthetic rate and photosynthetic parameters showed no significant difference. However, there was a significant correlation between photosynthetic parameters. It showed that the diurnal variation of photosynthetic rate was affected by the combined factors of the photosynthetic characteristic parameters. K results in diurnal variation of photosynthetic rate in bimodal curve was affected by intercellular CO2 concentration (Ci). By variance analysis, the variance of K variance was smallest (4. 14) and the minimum was 2. 51. N and P did not appear midday depression of photosynthesis, and could provide theoretical support for high-yield cultivation techniques of Echium vulgare.