| （摘要内容经过系统自动伪原创处理以避免复制，下载原文正常，内容请直接查看目录。） 本实验以德国鸢尾一次花和二次花种类为资料，从植株生物学特征和光合特征两个层面上，研究一二次花种类在天然状态下的光合特征和分歧光周期对其花芽分化和光合特征的作用。实验成果注解：1。天然状态下：（1）叶绿素含量和光合才能呈明显相干性，其含质变化与一二次花种类开花特征与发展发育过程和外界情况变更亲密相干。一二次花种类叶绿素含量与其内部形状及光合特征相吻合，解释叶绿素含质变化与光合才能有明显的相干性。在必定水平上，可以依据叶绿素含量来直接断定植株光合才能与生育过程的情形。（2）各项光合目标亦与一二次花种类的开花特征与生育过程出现明显相干的接洽。在4～5月的发展季候，光合才能强，进入7月低温季候，光合才能削弱。花前光合才能强，德语毕业论文，花后弱；8月一次花光合才能变更迟缓，而二次花种类光合才能敏捷增长，为二次开花做预备。二次花种类与一次花种类比拟，具有较低的光赔偿点和较高的光饱合点，解释二次花种类对光的请求规模较一次花种类广，具有更普遍的生态顺应性。（3）德国鸢尾一二次花种类的光合日变更为双峰型。由植物光协影响的气孔限制与非气孔限制的判据可知，德国鸢尾一二次花种类的光协影响在午休这段时光能够长短气孔限制身分主导的。正午，PAR最年夜，空气湿度也降至最低，德语毕业论文，但仍能停止正常的心理运动，且净光合值到达最年夜，解释德国鸢尾抗旱性较强。Tr跟着PAR的降低增长，均于12：00阁下涌现峰值，同时与各自的Pn、Gs和PAR日变更趋向根本分歧，可以为其Pn正午下降是在低温、高光强下，因为过度的水份消费形成气孔封闭、气孔传导率降低而形成的。2。分歧光周期下：（1）永日照增进二次花种类的花芽分化过程和单花序上花芽数目的增长；短日照加快了一次花种类植株花芽分化过程，而永日照增进了其单花序上花芽数量的增长。（2）短日照下二次花单元叶面积的光合才能较强，但其整体光合才能是永日照年夜于短日照；永日照下一次花植株单元叶面积的光合才能较强。（3）一二次花种类的花芽分化与叶面积、叶干重和地上部门与地下部门的干重比值呈明显的正相干。这些成果明白了光周期对德国鸢尾一二次花种类花芽分化时代和数目的作用与其对植株生物量和光合特征的作用有关。 Abstract: This experiment to German iris a flower and second type of flowers for data, from the two aspects of photosynthetic characteristics and biological characteristics of plants, a secondary research for flower species in the natural state of light alloy characteristics and differences in photoperiod effects on the differentiation of flower bud and photosynthetic characteristics. The results of the experiment: 1. Under the natural state: (1) the chlorophyll content and photosynthetic ability show obvious coherence, and its content changes and the characteristics of the one or two flowering species and the development process and the change of the external environment. The chlorophyll content of the one or two species was consistent with its internal shape and photosynthetic characteristics, which could be explained by the correlation between chlorophyll content and photosynthesis. At a certain level, the photosynthetic ability and growth process of the plant can be determined directly according to the chlorophyll content. (2) the photosynthetic characteristics and the flowering characteristics of the one or two flower species were significantly related to the growth process. In 4 ~ May development season, photosynthetic ability, low temperature season in July, photosynthetic capacity weakened. Post anthesis photosynthetic ability is strong, weak after the flowers; August a spend close to change slowly, and secondary flower species photosynthetic to rapid growth, as the second flowering prepare. Secondary flower species and a flower are compared, with lower light compensation point and high light saturation point, explain secondary flower species to light the request size is a type of flowers, with more general ecological adaptation. (3) one or two species of Iris germanica flower diurnal photosynthetic change to Shuangfeng. By plant photosynthesis and stomatal limitation and non stomatal limit criterion shows, Iris germanica 12 spend kinds of photosynthesis in lunch this time can be dominated by the length of the stomatal limitation factor. Noon, most of the eve of the par, air humidity is minimized. But still can stop the normal movement of the psyche, and bare fitted to achieve the greatest explain Iris germanica with strong drought resistance. TR followed par decreased growth, to 12:00 your emergence peak, and their PN, GS and par on the change trend of fundamental differences, can be decreased for the PN at noon is in low temperature, high light intensity, because of the excessive consumption of water formed stoma closure, stomatal conductance is reduced and the formation of. 2. Under different light cycle: (1) permanent sunshine enhance secondary single flower order flower bud growth in the number of flower flower bud differentiation of species and; short sunshine to speed up the time spent during flower bud differentiation of species plants and permanent sunshine increased the single inflorescence on the number of flower bud growth. (2) the photosynthetic ability of the leaves area of the two flowers in short sunshine is stronger, but the whole photosynthetic ability is more than that of the short day. (3) the ratio of flower bud differentiation and leaf area, leaf dry weight, and the dry weight ratio of the aboveground and the underground departments was significantly positive in the one or two flower species. These results that photoperiod of Iris germanica 12 spend era of flower bud differentiation and the number of the species and its impact on Photosynthesis Characteristics and the biomass of plants related. 目录: |
