Effects of Nitrogen, Phosphorus and Potassium on Photosynthetic Physiology of Populus tomentosa Seedlings
In order to study the effects of different proportions of N,P,and K on seedling photosynthetic and physiological characteristics of Populus tomentosa hybrid clone No.BT17,an orthogonal experimental design L9(34) was adopted to carry out the experiment.The results were as follows,1) nitrogen and potassium had remarkably significant effects on net photosynthetic rate (Pn),transpiration rate (Tr),intercellular CO2 concentration (Ci),stomatal conductance (Gs) and chlorophyll content (Chl).2) With the increase of nitrogen input,Pn,Tr,Ci,Gs and Chl of the seedlings increased,while with the increase of potassium,Pn,Tr,Ci,Gs and Chl increased firstly and then decreased.3) The effect of nitrogen on Pn,and Chl was the greatest,while potassium had the greatest effect on Tr,Ci and Gs.4) Phosphorus had remarkably significant effects on Pn.With the increase of phosphorus input,Pn,increased firstly and then decreased.5) The effects of nitrogen,phosphorus and potassium on Pnmax (maximum photosynthesis rate),AQY (apparent quantum yield)and LSP (light saturation point) were insignificant,and nitrogen had a significant effect on LCP (light compensation point).6) Fertilization could improve the photosynthetic efficiency.The most appropriate nitrogen,phosphorus and potassium ratio for photosynthetic efficiency of seedlings was 7 ∶ 2.25 ∶ 0.5.
Populus tomentosanitrogenphosphoruspotassiumphotosynthetic characteristic
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