| This experiment takes western sichuan it section3at an altitude of1540m,1810m,2010m of golden delicious as test materials, application of CI-700ab/HR2000fiber spectrometer, Li-6400portable photosynthesis meter measuring and PAM2500portable chlorophyll fluorescence spectrometer, in different altitude physiological radiation spectral composition, the structure of the leaf photosynthetic characteristics and leaf, chlorophyll fluorescence parameters and fruit quality were studied, the results showed that:1. Physiological radiation strength spectrum of different wavelengths component increases with altitude rising, total radiation, UV-B, UV-A, blue, orange light and far-red were significantly increases with altitude, three elevation increased difference significantly; Purple light red light, nearly increased with the increase of altitude, three elevation difference significantly; Green light at an altitude of1810m and2010m between increase was not significant; Yellow light at an altitude of1540m and1810m between increase was not significant. The light quality and net photosynthetic rate had no correlation, and the light and the stomatal conductance and transpiration rate were significantly positive correlation.2. With the increase of altitude, leaf length, width, leaf area reducing, the higher the altitude or larger, the greater the altitude of2010m and an altitude of1540m,1810m; thickness also increases with altitude, the three significant differences; the palisade tissue increased altitude rising, three elevation difference significantly, and spongy tissue decreases with the increase of altitude, three elevation difference significantly; Main vein thickness and main vein catheter decreases with altitude increases, the largest three elevation difference is significant. Leaf length and leaf area of transpiration rate and stomatal conductance and a very significant negative correlation; The width of blade and stomatal conductance as significant negative correlation; Blade thickness and palisade tissue thickness and stomatal conductance and transpiration rate into extremely significant positive correlation; Spongy tissue and net photosynthetic rate into extremely significant negative correlation; Main vein thickness and net photosynthetic rate, transpiration rate and stomatal conductance of a significant negative correlation, the main vein catheter biggest diameter and the stomatal conductance and transpiration rate into a significant negative correlation.3. The chlorophyll a, chlorophyll b, chlorophyll (a+b) increased with altitude increase first and then decreased, maximum altitude of1810m, at an altitude of1540m at least, three elevation difference significantly,and Net photosynthetic rate and a significant positive correlation;Carotenoids increased with elevation, altitude1540m and the significant difference was found in an elevation of2010m, and the transpiration rate into significant positive correlation; The chlorophyll content and net photosynthetic rate, a significant positive correlation.4. Chlorophyll fluorescence parameters Fo over increases first decreases after the rising of altitude, and Fm, Fv/Fm, Fv/Fo, qP, ETR increases with altitude increase first and then decreased.ETR and net photosynthetic rate into significant positive correlation; Stomatal conductance and the Fo, Fm, Fv/Fm, Fv/Fo a significant positive correlation; Transpiration rate and the Fo, Fm into significant positive correlation. Overall, fluorescence dynamics parameters optimal at an altitude of1810m place, photosynthesis is strongest.5. Net photosynthetic rate decrease with altitude increases after the first increase, at an altitude of1810m in net photosynthetic rate, the biggest difference between with an altitude of1540m,2010m significantly; Transpiration rate and stomatal conductance increases with altitude,2010m increase in amplitude is greater than at an altitude of1540m,1810m, the extremely significant difference, while no significant difference at an altitude of1540m and an altitude of1810m.6. Single fruit weight, fruit diameter, soluble solid, soluble sugar and pericarp chlorophyll increased with altitude lower after rising first, most are at an altitude of1810m. Fruit weight at an altitude of1810m place significantly above an altitude of1540m and2010m; The fruit diameter3elevation differences between was not significant; Soluble solids at an altitude of1810m and extremely significant difference between an elevation of1540m; Soluble sugar at an altitude of1810m, with significant difference between an elevation of2010m, pericarp chlorophyll at an altitude of1810m and extremely significant difference between an elevation of2010m. Longitudinal diameter, fruit hardness, total acid, vitamin C, fruit anthocyanins were increased with elevation, the fruit vertical diameter, total acid, at an altitude of2010m and an altitude of2010m,1810m between the extremely significant difference; The fruit hardness, fruit anthocyanins three elevation difference significantly, vitamin C, at an altitude of2010m and an altitude of1540m,1540m difference between significantly, at an altitude of1540m and significant difference was found in an elevation of1810m; Skin anthocyanin three elevation difference significantly; Skin carotenoids along with the increase of altitude is reduced, at an altitude of2010m and an altitude of2010m and1810m significant difference. Single fruit weight and soluble solids and net photosynthetic rate into significant positive correlation; Strength, the longitudinal diameter and stomatal conductance, transpiration rate, a very significant positive correlation; Single fruit weight and stomatal conductance into extremely significant negative correlation, and the transpiration rate into a significant negative correlation; Anthocyanins and total acid, vitamin C, skin stomatal conductance, transpiration rate, a very significant positive correlation; Pericarp chlorophyll and carotenoids and stomatal conductance, transpiration rate into extremely significant negative correlation; Soluble total sugar and stomatal conductance, transpiration rate, a significant negative correlation.Based on analysis of all, at an altitude of1810m in the chlorophyll fluorescence parameters of optimal, the strongest photosynthetic characteristics and fruit quality is... |
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