Institutional Repository of Xishuangbanna Tropical Botanical Garden
| 植物光合水分关系及环境条件对其的影响 | |
| Alternative Title | The relationship between plant water relations and photosynthesis, and the influence of environmental factors |
| 章永江 | |
| Thesis Advisor | 曹坤芳 |
| 2011-11 | |
| Degree Grantor | 中国科学院研究生院 |
| Place of Conferral | 北京 |
| Degree Discipline | 生态学 |
| Keyword | 水力结构 光合水分利用效率 碳平衡 气候变化 养分含量 |
| Abstract | 植物的光合水分关系，即植物光合作用过程和水分吸收、运输、蒸腾过程之间的相互协作关系是一个古老但却缺乏深入探讨的植物学、生态学问题。要深入探讨植物的光合水分关系，就需要在不同的生态系统中建立关系并通过机理性的研究来揭示隐藏于后的普适性规律。本研究通过对四个地点（西双版纳热带植物园、哀牢山常绿阔叶林、巴西稀树草原、阿根廷巴塔哥尼亚灌木草原）植物光合水分关系的研究，试图从以下六个方面来机理性地探讨植物光合水分关系：1）植物光合水分关系随树木生长的变化； 2）植物光合作用和水分运输过程日间的协作；3）养分在植物光合水分关系中的作用；4）环境水分条件对植物光合水分关系的影响；5）植物光合系统和水分运输系统抗冻能力的相关性；6）植物光合水分关系对全球变化的响应。结果表明：1）随着树木长高，水分对光合的限制增强，树木为保证较好叶片供水而进行的水力结构调整会导致碳收支不平衡；2）中午枝条而非叶片的水分状况决定了叶片中午的光合表现，枝条和叶片的水分传导能力、以及枝条储水也对叶片中午光合有影响；3）水分运输能力和光合能力在苏铁类植物中无直接相关性，但是会通过促进养分吸收和运输间接影响苏铁的光合作用能力；4）环境水分条件变差在一定范围内不会影响植物的光合作用能力，但是会改变光合水分关系、并使植物在一天中能维持较高光合速率的时间减少；5）光合系统抗冻性和水分运输系统抗冰冻引起栓塞化能力并没有显著相关性，两种特性并无机制上的联系；6）植物的水分传导能力和光合能力在应对气候变化时具有一致性。 |
| Other Abstract | The relationship between plant water relations and photosynthesis is an old ecological and physiological topic, but requires researches in depth. The relationships need to be established for different ecosystems, and the underlying physiological mechanisms need to be studied to explain the potential patterns. Plant water relations and photosynthesis of plants from 4 different ecosystems (Xishuangbanna Tropical Botanical Garden, Ailao Mountain Subtropical Evergreen Broadleaf Forest, Brazilian Savanna, Patagonian Steppe) were studied focusing on different aspects: 1) Change in the relationship between plant water relations and photosynthesis as trees grow taller; 2) The coordination between plant water relations and photosynthetic gas exchange during the day; 3) The roles of nutrients in the relationship between plant water relations and photosynthesis; 4) The influence of habitat water regimes on the relationship between water relations and photosynthesis; 5) The relationship between freezing resistance of photosynthesis and xylem resistance to freezing induced embolism; 6) The response of the relationship between plant water relations and photosynthesis to global climate change. From the results, I concluded that: 1) The limitation of water supply on photosynthesis increases as trees grow taller, the hydraulic adjustments related to height have a physiological cost in terms of carbon imbalance; 2) Stem rather than leaf water status determines the midday leaf stomatal conductance, stem and leaf water transport efficiencies also influence the midday photosynthetic performances; 3) There is no direct coordination between leaf water supply and photosynthetic capacity in cycads, however, leaf water supply may influence photosynthesis indirectly via its facilitation on nutrient uptake and transportation; 4) Water deficits in some degree may not influence plant photosynthetic capacity, however may reduce stomatal conductance and daily carbon assimilation; 5) There is no relationship between freezing resistance of photosynthesis and xylem resistance to freezing induced embolism, these two physiological processes are two independent adaptations; 6) There is a coordination between plant water transport efficiency and photosynthetic capacity in responding to global climate change. |
| Document Type | 学位论文 |
| Identifier | https://ir.xtbg.ac.cn/handle/353005/9224 |
| Collection | 西双版纳热带植物园毕业生学位论文 |
| Recommended Citation GB/T 7714 | 章永江. 植物光合水分关系及环境条件对其的影响[D]. 北京. 中国科学院研究生院,2011. |
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| File Name/Size | DocType | Version | Access | License | ||
| 植物光合水分关系及环境条件对其的影响.p（2402KB） | 开放获取 | CC BY-NC-SA | Application Full Text | |||
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