| This article is through in the same habitat conditions because the different diameter at breast height as the research object, discussion pruinosa current year stems, leaves and flower buds form profiled number Nutrients and physiological and biochemical characteristics from vegetative growth to reproductive growth transformation process variation inherent relationship and mutual. The results of the study are as follows:(1) P. euphratica in distribution of three kinds of special-shaped leaves in different development stages, which began from level 2 diameter in broadly elliptic leaves, ovate from 4 diameter class began to emerge, broadly ovate leaves from 6 diameter class began to emerge. Flowers from 4 diameter class began to emerge, spend four to eight diameter class distribution area and the largest collection of flowers on the crown area are located in distribution area of ovate, spend 10-20 diameter class distribution area and the largest collection of flowers on the crown area were located, ovate or broadly ovate leaves area, the distribution of its space distribution range overlap degree is extremely high. Occurred in round leaf is a sign of ashes Euphrates poplar leaves into reproductive growth.(2) Stem, leaf, flower bud number of morphological variation on the performance, as the diameter class increase from the base to the top of the canopy and direction(crown the first layer to the first layer 5), flower buds width, petiole length, leaf perimeter and leaf area, the degree of stem diameter, number of flower buds per stem, flower bud length were gradually increased, while the number of pieces per stem, leaf index, stem length is gradually reduced, between its various indexes significantly positive / negative correlation. Each piece of leaf number, stem length were 4 diameter class began to have significantly reduced, but the beginning of a significant increase in the number of flower buds in 10 diameter class.(3) Stems and leaves of the current year total nitrogen, variation of total potassium, total phosphorus, organic carbon and carbon-nitrogen ratio of performance, with the diameter class increase from the base to the top of the canopy and direction(crown the first layer to the fifth layer), they were gradually increased, the diameter level 4 is significantly increased leaf total nitrogen content of a turning point, 6 diameter class is a significant increase in blade N ratio of the turning point. The Health and stems, a significant increase in soluble sugar and soluble protein content of 2-6 diameter class, diameter class 8 to stabilize current year stems and starch content of leaves at 16 size significantly reduce the number of flower buds and flower buds size 16 size starting to reach a higher level match. The Health and stems, leaf total nitrogen, total phosphorus, total potassium, organic carbon content, carbon and nitrogen ratio and soluble sugar content was high with a crown diameter and between significant / significant positive correlation.(4) Pruinosa individual development process, stems, leaves and DBH mutual relationship exists Allometric. Among them, the leaf area growth rate is greater than the reduced number of pieces of each leaf and stem length is less than the rate of decrease of leaf area growth rate is less than the diameter of the growth rate, decrease the speed of chips per leaf and stem length of less than DBH growth rate, the growth rate is greater than the number of flower buds per stem of each leaf stem length and number of pieces of reduced speed. Pruinosa in diameter, stems, leaves and flower buds number morphology different growth rates exhibited Allometric relationship is possible that its genetic basis of the result of the selection of the natural environment. |
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