بررسی وضعیت تغذیه ای درختان و درختچه های باغ گیاه شناسی ملی ایران

‭Nutritional status of trees and shrubs in National Botanical Garden of Iran. The National Botanical Garden of Iran (NBGI) with an area of 145 hectares, contains various plants with different ecological requirements, including trees, shrubs, herbs and ornamentals. . Weakness and decline of some tree species of Botanical Garden is one of the problems which considered as the main priorities to be investigated by the garden authorities. Soil productivity and plant nutrient were concerned to be studied.. For this reason, soil and leaf were sampled from different parts of the Garden and 10 important tree species, respectively. Overall, 8 soil profiles were provided at different parts of the garden and soil samples were taken from three layer of each profile (0-10, 10-30, 30‬ص‭t aOCm) after studying the soil profile morphology. Leaf sampling was made at appropriate time in order to test N,P, K at first year and N,P,K, Ca, Fe, Mn and Zn at second year. The results showed that the soil texture was sandy, organic mater was low and pH varied between 7/6-8/2. The mineral elements in most sites were lower than the optimum range in soil and tree leaves. It can be concluded that increasing soil organic matter, adding adequate amount of manure and chemical fertilizers to soil and applying appropriate irrigation regime might improve the plants health and growth and prevent their decline. Key words: growth, decline, tree, forest, soil, foliar NPK‬

کلیدواژه ها:

درختچه ها ، درختان ، تغذیه ، باغ گیاه شناسی ملی ایران ، گیاهان علفی ، گیاهان زینتی ، اکولوژی ، نیتروژن ، فسفر ، پتاسیم