| In this paper, the different growth stages under the same ecological conditions (age) P.euphraticaindividuals for the study, using statistical methods to analyze the relationship between different types oftemporal regularity P. euphratica leaf shaped leaf distribution and morphological changes with age in;technologies to observe and analyze the use of paraffin shaped leaf blades of different types of anatomicalfeatures; using physiological and biochemical methods to explore different types of shaped leaf solublesugar, starch and soluble protein and mineral nutrient content changes correlated with leaf, revealing theperformance of P. euphratica shaped leaves on the tree morphological differences in the anatomy andphysiology temporal basis. The results were as follows:(1) P.euphratica shaped leaf type, spatial distribution and diameter class relations results, With thegrowth and development of plants P.euphratica conducted leaf index showed a decreasing trend, while theleaf area showed an increasing trend; frequency strip leaves appear on the crown, and concentrated on thelargest proportion decreasing, ovate leaves and frequency broadly ovate leaves appear on the trees, thelargest and centralized distribution ratio gradually increased. Preliminary results show that the strip leaves,lanceolate leaves, ovate leaves and broadly ovate leaves in the canopy appeared regularly, and theoccurrence of dynamic growth and decline of individual growth and development process and P.euphraticahave a close relationship.(2) the relationship between the findings P.euphratica leaf morphology and diameter showed, Withthe growth and development process of progressive P.euphratica, mainly macroscopic changes in the shapeand size of leaves, veins and petioles feature length; microscopic mainly in the epidermis and mesophylldifferences. Through the P.euphratica four developmental stages between individual leaf morphology traitsprincipal component analysis showed that morphological differences P.euphratica leaves macro primarilyby leaf index and number of primary lateral veins caused while under the micro primarily by the number ofepidermal cells, the length of the epidermal cells and adaxial palisade tissue thickness caused; whilestructural differences at different levels of the same developmental stage canopy leaf morphology also bydifferent morphological traits caused. Membership function of fuzzy mathematics method to differentdevelopmental stages of individual P.euphratica comprehensive evaluation of drought resistance, theresults showed that: when in leaf morphology index as the evaluation index, drought resistanceperformance of four developmental stages of P.euphratica: D-type> C-> B-type> A-type.(3) P.euphratica leaf physiological and biochemical changes in the relationship between DBH andtheir findings show that,In P.euphratica individual growth and development is closely related to changes inthe starch content and GA3/IAA content ratio in leaf width; changing the blade length is closely related tochanges in the content of soluble protein; leaf blade change with the starch and soluble protein contentindex and is closely related to the ratio of the change GA3/IAA content. Preliminary results indicate thatchanges in physiological and biochemical content of leaves increases with DBH occurred leaf morphologymay be the result of physiological and biochemical changes with DBH basis.(4) changes in leaf mineral nutrient characteristics and its relationship with the diameter classresearch results show, With the growth and development of the individual P.euphratica conducteddecreases, increased leaf blade leaf area index, along with the reduction in total K content in leavesincreased leaf total N and total P content. Preliminary studies suggest that changes in leaf and total N, totalP and total K changes related content, leaf area index and leaf changes that occur with increasing diameter may be the structural basis of leaf nutrient lead with DBH change. |
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