| 胡杨气体交换特性 |
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| 引用本文： | 马焕成, 王沙生, 蒋湘宁. 胡杨气体交换特性[J]. 西南林业大学学报, 1998, 18(1): 24-32.doi:10.11929/j.issn.2095-1914.1998.01.004 |
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| 作者姓名： | 马焕成 王沙生 蒋湘宁 |
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| 作者单位： | 1. 西南林学院林业系, 昆明, 650224;;2. 北京林业大学森林生物中心, 北京, 100083 |
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| 基金项目： | 国家自然科学基金和国家教育委员会"优秀青年教师基金"资助项目.
摘要:通过测定土培条件下净光合速率及其相关参数的日进程,发现胡杨净光合速率的最大值出现在中午辐射最强的时间;胡杨光饱和点高达2800 μmol m-2s-1,说明具有C4植物的光合特性,但CO2补偿点和饱和点分别高达150 μmol mol-1和900 μmol mol-1,说明胡杨仍属于C3植物.此外,扫描电镜观察胡杨叶片表面有蜡片结构,可能与胡杨长期适应沙漠强辐射和高蒸腾的环境有关.胡杨气孔阻力全天变化不大,表明胡杨的气孔运动保留了河岸起源的特点,而典型的叶片旱生结构可能是长期适应干旱环境逐渐发育的结果 |
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| 摘 要： | 通过测定土培条件下净光合速率及其相关参数的日进程,发现胡杨净光合速率的最大值出现在中午辐射最强的时间;胡杨光饱和点高达2800 μmol m-2s-1,说明具有C4植物的光合特性,但CO2补偿点和饱和点分别高达150 μmol mol-1和900 μmol mol-1,说明胡杨仍属于C3植物.此外,扫描电镜观察胡杨叶片表面有蜡片结构,可能与胡杨长期适应沙漠强辐射和高蒸腾的环境有关.胡杨气孔阻力全天变化不大,表明胡杨的气孔运动保留了河岸起源的特点,而典型的叶片旱生结构可能是长期适应干旱环境逐渐发育的结果
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| 关 键 词： | 胡杨 日进程 光合 气体交换 |
The Diurnal Pattern of Gas Exchange in P. euphratica |
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| Ma Huancheng, Wang Shasheng and Jiang Xiangning. The Diurnal Pattern of Gas Exchange in P. euphratica[J]. Journal of Southwest Forestry University, 1998, 18(1): 24-32.doi:10.11929/j.issn.2095-1914.1998.01.004 |
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| Authors: | Ma Huancheng Wang Shasheng Jiang Xiangning |
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| Affiliation: | 1. Forestry Department, Southwest Forestry College, Kunming, 650224;;2. Experimental Center of Forest Biology, Beijing Forestry University, Beijing, 100083 |
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| Abstract: | The measurements on photosynthesis and related parameters indicated that CO2 compensation point and saturation point increased,while Rubisco activity decreased with the increase of salt stress for two genotypes Under high salt treatment,the net photosynthesis of P. euphratica recovered from salt stress when soil salt content was about 0.7% NaCl,while that of hybrid only recovered when soil salt content was less than 0.2% NaCl and was unable to when soil salt content was about 0.5% NaCl;chlorophyll a contents and Chl a/b ratio increased,while chlorophyll b and carotenoid contents decreased with increasing salt levels Fluorescence patterns confirmed that reduction of photosynthesis under high salt treatment was not due to damage of photosynthetic apparatus but due to inhibition of the dark reaction. |
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| Keywords: | P. euphratica Diurnalpattern Gas exchange Photosynthesis |
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