水肥耦合对铃兰观赏品质及光合特性的影响

Effects of Water and Fertilizer Coupling on the Ornamental Quality and Photosynthetic Characteristics of Convallaria keiskei Miq.

采用水（200（W1）、400（W2）、600（W3）m L 3水平）、肥（0.15（F1）、0.35（F2）、0.55（F3）、0.75（F4）g·kg-14水平）二因素随机区组试验设计,不设对照,分析各处理对铃兰观赏品质指标和光合特性的影响。结果表明：水肥耦合对铃兰观赏品质指标和光合特性影响显著。肥量一致条件下,随着水量增加,观赏品质指标数值也相应提高,净光合速率增大;水量增加同时增加肥量一定范围内可表现正效应,过量则起负作用;水肥耦合处理间差异显著（P〈0.05）,模糊综合评判观赏品质较好的为W2F3、W2F2、W3F2,较差的为W1F4,根据光强-光合响应模拟曲线得出铃兰光饱和点和光补偿点分别为430、45μmol·m-2·s-1,属耐阴植物;回归分析表明,光合速率与气孔导度、蒸腾速率呈正相关,相关系数分别为0.884 5、0.934 6,与细胞间二氧化碳摩尔分数呈负相关（R=-0.777 3）,对净光合速率影响较大的是蒸腾速率。水量400~600 m L,肥量0.35~0.55 g·kg-1的效果较好,与其他处理差异显著。

We used two factors of randomized block experimental design of water level（（W1） 200,（W2） 400,（W3） 600 m L）and fertilizer level（（F1） 0.15,（F2） 0.35,（F3） 0.55,（F4） 0.75 g·kg-1） without CK to study the effects of each treatment on the ornamental quality index and photosynthetic characteristics of Convallaria keiskei Miq.The effects of water and fertilizer coupling on the ornamental quality index net photosynthetic characteristic of C.keiskei Miq.were significant.The ornamental quality index figure and net photosynthetic rate were raised with water level rising in the same fertilizer level.Appropriate fertilizer level was the same result with water level rising,but more fertilizer level would play a negative role.Differences between treatments were significant（P〈0.05） and the treatments of W2F3,W2F2,W3F2 were of higher ornamental quality with fuzzy comprehensive evaluation,and W1F4 was poorer.The light saturation point and light compensation point were 430 and 45 μmol·m-2·s-1with PA,R-Pncurve fitting,and C.keiskei Miq.was the shade plant.The photosynthetic rate had positive correlation with stomatal conductance and transpiration rate with the correlation coefficients of 0.884 5 and 0.934 6,respectively,and had negative correlation with intercellular CO2content（R =-0.777 3）.Trhad larger influence on Pn.By correlative data analysis,the coupling of water levels of from 400 to 600 m L and fertilizer levels of 0.35-0.55 g·kg-1had better effect and significant differences compared with other treatment.