Studies On The Variations And Distribution Of Nutrient Elements Content In Sophora Japonica Var. Pendula

Sophora japonica var. pendula seedlings was selected as test materials to study in a growth period that the content variations and distribution rules of nutrient elements and the correlation between elements in each organ of Sophora japonica f.pendula under different fertilization treatments conditions. The results showed that:(1) The nutrition element content of N、P、Ca、Mg、Fe、Mn had a seasonal change. The overall change of content of every element treatment was roughly the same under the different fertilization treatments. The variation trend of N element in leaves was down-up-down. The variation trend in branches was up-down-up. In root, it was low-up. The variation trend of P element in its organs was consistent: low-up-low. The tendency of Ca element in leaves and branches was on the rise. The tendency of Mg element in leaves and roots whose diameter≤2mm was up-down. The tendency in branches was up-down and the tendency in roots whose diameter>2mm was down-up-down-up. The variation trend of Fe element in leaves was up-down-up-down. In branches it was up-down and in roots it was up-down-up. The variation trend of Mn element in leaves was on rise and in branches it was low-up. The tendency in roots whose diameter≤2mm was up-low up and in roots whose diameter>2mm was up-down. Chinese pagoda tree absorbed more elements of Ca and Fe under no fertilization. It absorbed more elements of N、P and Mn under nitrogen fertilizers. It absorbed more elements of N、P and Mn under phosphorus fertilization. It absorbed more elements of N and Mg under the nitrogen phosphorus compound fertilizer.(2) In addition to the content of Fe elements that was the highest in the root, the other elements’ content in the leaves was the highest; In the branches, each element content in annual branches was higher than in the perennial branches; the content of minor element in roots that diameter less than2mm was the higher than that greater than2mm. The highest element in leaves and roots was N. The content of element Ca in branches was low. The content of element Fe was higher than element Mn in which organs.(3)In leaves, Ca, P, Fe had significant interaction with each other. In the annual branches, Ca, Mg, Fe, Mn had significant interaction with each other. In the perennial branches, the element that had the most significant interaction with others was N, and then were Mg, Fe. In roots that diameter greater than2mm, N had had the most significant interaction with others. In roots that diameter less than2mm, P, Ca, Fe, Mg had significant interaction with each other.