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盆栽红树植物桐花树(Aegiceras corniculatum)1年生幼苗,研究了在浇灌淡水和人工海水2种情况下不同遮光度(透光率25%、45%和100%)处理对盆栽桐花树生理生态的影响。结果表明,处理360d后,在相同盐度处理下植株的茎高年增量随光照强度减弱而增大,3种光照强度处理之间差异极显著,而茎径年增量则与茎高年增量相反。平均每株分枝数、叶片数、叶面积和叶片厚度存在显著差异。在相同盐度处理下,光照强度25%和45%处理的植株叶片叶绿素a、叶绿素b、总叶绿素含量无显著差异,但均显著高于100%光照强度,而6种处理植株叶片叶绿素a/b比值没有显著差异。在相同盐度处理下,随着光照强度的降低,净光合速率、可溶性糖含量、硝酸还原酶(NR)活性和根系活力均呈下降趋势,且不同光照强度处理间存在极显著差异。在同一光照强度下,淡水组的可溶性糖含量、NR活性和根系活力均比人工海水组低。试验表明,遮光对盆栽桐花树的生理生态有显著影响。
One-year-old seedlings of mangrove Aegiceras corniculatum were planted in pots. The effects of different shading degrees (25%, 45% and 100% transmittance) on the growth of Aegiceras corniculatum Ecological effects. The results showed that after the treatment for 360 days, the annual increment of stems increased with the decrease of light intensity under the same salinity treatment. The difference of three kinds of light intensity treatments was extremely significant, while the annual increment of stem diameter and stem height The opposite is true. The average number of branches per plant, leaf number, leaf area and leaf thickness were significantly different. Under the same salinity treatment, the contents of chlorophyll a, chlorophyll b and total chlorophyll of the leaves treated with 25% and 45% of light intensity were all significantly higher than those of 100% light intensity, but the leaf chlorophyll a / b ratio was not significantly different. Under the same salinity treatment, net photosynthetic rate, soluble sugar content, nitrate reductase (NR) activity and root activity decreased with the decrease of light intensity, and there were significant differences among different light intensities. Under the same light intensity, the soluble sugar content, NR activity and root activity of fresh water were lower than that of artificial sea water. Experiments show that shading has a significant impact on the physiology and ecology of the Aegiceras corniculatum.