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通过人工遮光,研究了不同光照强度下入侵植物三裂叶豚草的形态、生物量分配以及光合特性的表型可塑性.结果表明:与对照相比,遮光条件下,三裂叶豚草的株高、冠宽、单株叶面积、比叶面积和叶生物量比重显著增加,总生物量、单位叶面积生物量和根冠比减小;在全光照条件下,其冠宽和单株叶面积较小,根冠比较大,有利于高温强光下减少水分散失,表现出对不同光强较强的形态和生物量可塑性.遮光使三裂叶豚草叶片的日均净光合速率、蒸腾速率和气孔导度下降,胞间CO2浓度上升.正午光照最强时,低遮光处理植株的净光合速率、蒸腾速率和气孔导度最大.中遮光和高遮光条件下,其叶绿素含量显著增加,叶绿素a/b显著减小,有利于提高三裂叶豚草的光能利用效率,以适应弱光环境.
The morphology, biomass allocation and photosynthetic plasticity of invasive plant Tripterygulina were studied by artificial shading. The results showed that compared with the control, shading, Crown width, leaf area per plant, specific leaf area and leaf biomass increased significantly, total biomass, biomass per unit area and root / shoot ratio decreased. Under full light conditions, the crown width and single leaf Smaller area and larger root canopy, which is conducive to reducing water loss under high temperature and high light, showing strong morphological and biomass plasticity to different light intensities. Shading led to daily average net photosynthetic rate and transpiration The rate and stomatal conductance decreased, and the intercellular CO2 concentration increased.The photosynthetic rate, transpiration rate and stomatal conductance of low light shading treatments were the highest at the highest noon shading.The chlorophyll content increased significantly under shading and shading conditions, Chlorophyll a / b significantly reduced, is conducive to improving the energy utilization efficiency of the three-part ragweed to adapt to low light environment.