The Accumulation Patterns and Distribution Characteristics of Nutrient Elements in Dictamnus dasycarpus During Different Growth Stages
This study focuses on three-year-old Dictamnus dasycarpus,analyzing the accumulation patterns and distribution char-acteristics of nutrient elements in the roots,stems,and leaves at different growth stages by measuring their dry mass and nutrient content.The findings aim to provide a theoretical basis for precise fertilization of D.dasycarpus.The results showed that during the growth of D.dasycarpus,the accumulation of different nutrient elements follows the order from highest to lowest:nitrogen(N),calcium(Ca),phosphorus(P),potassium(K),magnesium(Mg),iron(Fe),manganese(Mn),zinc(Zn),and copper(Cu).In the early growth stages,the mass fractions of N,P,and K are relatively high,indicating a significant demand for these elements.From seedling to budding stages,the distribution ratio of N,P,and K accumulation in the roots notably decreases,while the distribution ratio in the stems and leaves significantly increases.Starting from the pre-fruit stage,the mass fractions and accumulation of Ca and Mg in the stems and leaves of D.dasy-carpus significantly increase,with a relatively high distribution ratio in these organs.During the pre-fruit and mid-fruit sta-ges,the mass fractions of Fe and Mn in the stems and leaves significantly increase,with the accumulation of Fe and Mn being relatively high during the mid-fruit stage and an increase in their distribution ratio in these organs.Additionally,the mass fraction of Zn in the roots significantly increases from the pre-fruit to the mid-fruit stages,and the overall accumula-tion significantly rises,reaching the maximum distribution ratio in the roots during the mid-fruit stage.The mass fractions of Cu and Zn in the stems and leaves are relatively high during the budding stage,with their distribution ratio peaking at this time.Thus,D.dasycarpus requires substantial supplementation of macronutrients(N,P,K)and micronutrients(Cu,Zn)from the seedling to the budding stages,and requires supplementation of secondary macronutrients(Ca,Mg)and mi-cronutrients(Fe,Mn,Zn)from the pre-fruit to the fruit ripening stages.
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