|
|||||
|
|
| 干旱胁迫对莫莫格湿地芦苇叶片光合生理生态的影响机理研究 | |
| 引用本文： | 邓春暖,章光新,潘响亮.干旱胁迫对莫莫格湿地芦苇叶片光合生理生态的影响机理研究[J].湿地科学,2012,10(2):136-141. |
| 作者姓名： | 邓春暖 章光新 潘响亮 |
| 作者单位： | 1. 中国科学院湿地生态与环境重点实验室,中国科学院东北地理与农业生态研究所,吉林长春130012;云南师范大学高原湖泊生态与全球变化实验室,云南师范大学旅游与地理科学学院,云南昆明650500 2. 中国科学院湿地生态与环境重点实验室,中国科学院东北地理与农业生态研究所,吉林长春130012 3. 中国科学院干旱区生物地理与生物资源重点实验室,中国科学院新疆生态与地理研究所,新疆维吾尔自治区乌鲁木齐830011 |
| 基金项目： | 中国科学院知识创新工程重要方向性项目(KZCX2-YW-Q06-2);国家重点基础研究发展计划项目(2010CB428404)资助 |
| 摘 要： | 为了揭示干旱胁迫对芦苇(Phragmites australis)叶片光合生理生态的影响机理,利用LI-6400便携式光合仪和快速叶绿素荧光仪,对干旱胁迫条件下的芦苇叶片光合生理以及芦苇生长状态进行测量分析。结果表明,干旱5d后,芦苇叶片光合速率小幅下降,干旱15d后,其光合速率明显下降,芦苇生长受到显著抑制;干旱胁迫下,芦苇叶片叶绿素含量先增加后减少;芦苇叶片光系统II(PSII)对干旱胁迫反应较敏感,在干旱20d后,其光合电子传递能力和光合性能指数下降,热耗散增加。在干旱胁迫初期,芦苇叶片光合速率的下降以气孔限制为主;在干旱胁迫后期,非气孔限制与气孔限制都起作用,其中非气孔因素主要是指光系统II活性的下降,活性反应中心减少,电子传递能力下降,降低了光系统II的整体光化学性能,进而降低了芦苇叶片的光合速率,抑制了芦苇的生长。 |
| 关 键 词： | 芦苇 干旱胁迫 光合速率 光系统II 莫莫格湿地 |
Mechanism of Influence of Drought Stress on Photosynthetic Physiological Ecology of Phragmites australis Leaves in Momoge Wetlands |
|
| DENG Chun-Nuan , ZHANG Guang-Xin , PAN Xiang-Liang.Mechanism of Influence of Drought Stress on Photosynthetic Physiological Ecology of Phragmites australis Leaves in Momoge Wetlands[J].Wetland Science,2012,10(2):136-141. | |
| Authors: | DENG Chun-Nuan ZHANG Guang-Xin PAN Xiang-Liang |
| Institution: | 1.Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130012,Jilin,P.R.China;2.Key Laboratory of Plateau Lake Ecology & Global Change,College of Tourism and Geographic Science,Yunnan Normal University,Kunming 650500,Yunnan,P.R.China;3.Key Laboratory of Biogeography and Bioresource in Arid Land,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang Uygur Autonomous Region,P.R.China) |
| Abstract: | To reveal the mechanism of influence of drought stress on the photosynthetic physiology of Phragmites australis leaves,the growth and photosynthetic characteristics of reed leaves exposed to drought stress were measured by LI-6400 portable photosynthesis system and chlorophyll fluorescence fluorometer.The results showed that the growth of Phragmites australis was significantly inhibited after 15-day drought.The photosynthesis rate(Pn) of the leaves declined after 5-day drought and declined further after 15-day drought.The chlorophyll content increased after 5-day drought,but it decreased after longer-time drought.The photosystem II of the leaves was sensitive to drought stress.The electric transfer(ETO/RC) and photosynthesis index(PIABS) decreased,heat dissipation(DIO/RC) increased after 20-day drought.The results suggested that the stomotal limitation is the main reason of the decrease of photosynthesis rate of the leaves after short-term drought;the non-stomotal limitation and stomotal limitation all lead to the decrease of photosynthesis rate after long-term drought.The non-stomotal limitation includes the decrease of the activity of photosystem II.The active reaction centers decreased,photosynthesis rate of the leaves reduced and finally the growth of Phragmites australis was inhibited. |
| Keywords: | Phragmites australis drought stress photosynthesis rate phototsystem II Momoge wetlands |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |