沙拐枣光合生理特性的比较研究
文献类型：学位论文
| 作者 | 潘航 |
| 答辩日期 | 2017-05-01 |
| 文献子类 | 硕士 |
| 授予单位 | 中国科学院大学 |
| 授予地点 | 新疆乌鲁木齐 |
| 导师 | 尹林克 ; 冯缨 |
| 关键词 | 沙拐枣 光合 抗性指标 生态化学计量学 Calligonum L. Photosynthesis Resistance index Ecological stoichiometry |
| 学位专业 | 理学硕士 |
| 英文摘要 | Species of Calligonum L. in Turpan desert botanical garden of Chinese Academy of Sciences Institute of Xinjiang Ecology and Geography were chosen as research materials confirmed by consulting specimen and relevant literature information. Their photosynthetic characteristics, physiological indicators, element contents were measured and analyzed through the mean variance analysis and the principal component analysis. All these results could supply theoretical basis for the protection, restoration and reasonable utilization of Calligonum L. The results of the study were as follows:(1) There were significant differences between genus Calligonum species. Survey of 4 species’ daily variation of net photosynthetic rate (Pn) of Calligonum L. showed that C. calliphysa, C. Leucocladu and C. Klementzii were “double peaks” and C. ebi-nurcum was “single peak”. The influencing factors of photosynthetic rate to C. calliphysa, C. Leucocladu and C. Klementzii were mainly composed of non-stomatal factors.(2) The photosynthetic characteristics of 4 Calligonum species were examined and analyzed by the modified rectangular hyperbola model. It revealed that C. ebi-nurcum was plant with high Pn and transpiration rate (Tr), C. ebi-nurcum had higher maximum net photosynthetic rate (Pmax), light saturation point (LSP) and large range of light adaptation which showed well adaptability to the environment. C. calliphysa had the highest water use efficiency (WUE), low transpiration rate, low photosynthetic rate, low stomatal conductance and high stomatal limitation(Ls), and this can explain that C. calliphysa enhance water use efficiency to adapt drought stress by reducing stomatal conductance to reduce transpiration rate. Moreover, the lowest apparent quantum yield (AQY) and highest light compensation point (LCP) were observed in C. calliphysa which seemed to be the low utilization of light. C. Leucocladu had highest AQY and lowest LCP value which showed the efficient use of weak light, while the photosynthetic rate sharply drop at noon influenced by non-stomatal factors. C. Klementzii was poor adaptability to the drought environment with low WUE, Pmax and light utilization range. These analysis results were highly conform to the ecological distribution of genus Calligonum in Xinjiang.(3) 10 Calligonum species were selected to study the differences of physiological characteristics of Calligonum species under the desert habitat. 7 physiological indexes were measured, the differences were analyzed by variance analysis, and resistance was comprehensively evaluated by principal component analysis. The results showed that the physiological indexes in the same habitat were significantly different (P<0.01), the comprehensive resistance was in the following order: C. junceum > C. ebi-nurcum > C. densum > C. leucocladum > C. klementzii > C. cordatum > C. rubicundum > C. arborescens > C. caput-medsae > C. pumilum. Calligonum have different resistance mechanisms with different content of protective enzyme. The results were very anastomotic with ecological distribution of Calligonum in Xinjiang. The experiment could provide scientific basis for introducing, cultivating and screening desert plants of Calligonum in resistance.(4) The analysis of element contents of 10 Calligonum species showed that the distribution of nitrogen (N) phosphorus (P) and kalium (K) was inequality in different Calligonum species which dues to the selective absorption. The contents of N was highest in C. arborescens, lowest in C. rubicundum, and all 10 species were below the average level of China 20.2 g/kg, the global average 20.6 g/kg and the north desert level 24.4 g/kg. The contents of P was highest in C. densum, lowest in C. pumilum, and 5 species were below the average level of China 1.46g/kg, and 8 species were below the global average 1.99 g/kg. The contents of K was found highest in C. rubicundum and lowest in C. rubicundum. These revealed that C. arborescens could better use N element, C. densum had high utilization of P, while C. rubicundum made efficient use of K.(5) The ratio element content between ten Calligonum species also showed significant difference. The N/P ratio was found highest in C. pumilum and lowest in C. densum and C. cordatum. The N/K ratio was found higher in C. arborescens, C. calliphysa, C. pumilum and C. caput-medusae, while lower in C. leucocladu, C. rubicundum and C. Cordatum. C. leucocladu and C. rubicundum had highest K/P ratio while C. densum had the lowest. This study suggested that genus Calligonum in Turpan desert botanical garden were easily affected by N limitation. Especially for nitrogen deficiency in Xinjiang desert, introducing, cultivating and screening Calligonum specie with efficient absorption and utilization of N, high efficiency of photosynthesis and high adaptation to stress is very important.Key words: Calligonum L.; Photosynthesis; Resistance index; Ecological stoichiometry. |
| 学科主题 | 植物学 |
| 语种 | 中文 |
| 源URL | [http://ir.xjlas.org/handle/365004/14893]  |
| 专题 | 新疆生态与地理研究所_研究系统_荒漠环境研究室 |
| 作者单位 | 中国科学院新疆生态与地理研究所 |
| 推荐引用方式 GB/T 7714 | 潘航. 沙拐枣光合生理特性的比较研究[D]. 新疆乌鲁木齐. 中国科学院大学. 2017. |
入库方式： OAI收割
来源：新疆生态与地理研究所
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