氮对枸杞枝条基质栽培番茄光合荧光特性影响

Effects of Nitrogen on Photosynthetic Fluorescence Characteristics of Tomato Cultivated in Lycium barbarum Branch Substrate

为在枸杞枝条基质栽培下,番茄氮肥的合理施用提供参考依据。采用随机区组设计,以自主研发的枸杞枝条蔬菜栽培基质为栽培基质,设置5个氮素水平,研究不同施氮量对番茄光合气体交换参数、叶绿素荧光诱导动力学曲线(OJIP曲线)及参数的影响。结果表明,施氮显著影响番茄叶绿素的合成和光合气体交换,提高番茄最大光化学效率、潜在光化学效率等光能性能指数,同时改变番茄OJIP曲线形状。适当施氮可增加番茄产量,增强植株光合特性,在N3处理时,番茄产量达到最大值,吸收的光能、捕获的光能、耗散均适中,可较大程度增加光能利用率,提高光合效率。且番茄产量与光合特性间存在显著相关性(P<0.05),与光化学效率指标Fv/Fm和Fv/Fo呈显著正相关。

Inder to provide a reference for the rational application of nitrogen fertilizer in tomato under the cultivation of Lycium barbarum branche subatrate,a randomized block design was used in this experiment.Five nitrogen levels were set up to study the effects of different nitrogen application rates on photosynthetic gas exchange parameters,leaf rapid chlorophyll fluorescence kinetic curves and parameters of tomato based on the self-developed L.barbarum branch vegetable cultivation substrate.The results showed that nitrogen application significantly affected the synthesis of chlorophyll and photosynthetic gas exchange of tomato,increased the maximum photochemical efficiency,potential photochemical efficiency and other light energy performance indexes of tomato,and changed the shape of tomato OJIP curve.Appropriate nitrogen application could increase the yield of tomato and enhance the photosynthetic characteristics of plants.Under N3 treatment,the yield of tomato reached the maximum,and the absorbed light energy,captured light energy and dissipation were moderate,which greatly increased the utilization rate of light energy and improved the photosynthetic efficiency.There was a correlation between tomato yield and photosynthetic characteristics(P<0.05),and a significant positive correlation with photochemical efficiency indexes Fv/Fm and Fv/Fo.