氮磷钾不同配比对丽江云杉幼苗生理生长的影响OA北大核心CSTPCD

Taking the three-year high-quality seedlings of Picea likiangensis as the research object,the ortho-gonal design of 3 factors and 3 levels was used to treat seedlings with 9 different fertilization treatments with dif-ferent ratios of nitrogen,phosphorus and potassium through pot experiments to analyze the effects on the growth and photosynthetic physiology of P.likiangensis seedlings.The results showed that different proportion of nitro-gen,phosphorus and potassium had certain promotional effects on the seedling height,crown width,chlorophyll content and photosynthetic characteristics of P.likiangensis seedlings,but there were differences among treat-ment groups.The T7 fertilization ratio(urea 5 g/plant,calcium superphosphate 7 g/plant,potassium sulfate 2.5 g/plant)had the most obvious promotional effect on the crown width,chlorophyll content,net photosynthetic rate,stomatal conductance,transpiration rate and light compensation point of P.likiangensis,which was signific-antly higher than that of the control.In general,T7 fertilization was the most beneficial to the growth and promo-tion of photosynthetic capacity of P.likiangensis seedlings among different fertilization groups.