Effect Of Fertilization In Late-season On Physiological Growth Of Alnus Formosana(Burkill) Makino

Alnus formosana(Burkill)Makino produced in Taiwan Province.In this study,the0.5-year-old seedlings of Alnus formosana(Burkill)Makino were treated with-late season fertilization experiment.The fertilization experiment was designed with three factors and two levels,8 treatments in total,each treatment had 10 repetitions.The growth physiology,cold tolerance and drought tolerance of Alnus formosana(Burkill)Makino seedlings in late-season fertilization were measured.The results are as follows:1.Different late-season fertilization treatments increased the contents of different element N,P and K by Alnus formosana(Burkill)Makino seedlings.P was the highest absorbing element,followed by N and K,N and P promoted the physiology,growth and stress resistance of Alnus formosana(Burkill)Makino seedlings;2.In late-season fertilization,compared with CK,the N,P and N~*P element could improve the comprehensive quality of Alnus formosana(Burkill)Makino seedlings,and promote the following indicators:ground diameter,plant height,quality index,root growth related indicators(root length,root projected area,root surface area,root diameter,root volume),chlorophyll,peroxidase activity,leaf photosynthetic physiological related indicators(instantaneous net photosynthetic rate,stomatal conductance,intercellular carbon dioxide concentration,transpiration rate),the whole state weight of N,P,K,Ca,Mg element in the leaf;3.In late-season fertilization,the mixed fertilization of P~*K,N~*K and N~*P~*K had little effect on the comprehensive quality of Alnus formosana(Burkill)Makino seedlings,but N~*P~*K combined application improved the resistance of seedlings,mainly improved the drought resistance;4.Under the sole action of K element,the seedlings of Alnus formosana(Burkill)Makino had obvious toxic effect,which resulting in the decline of thecomprehensive quality of seedlings.