| 干旱和复水对崖柏光合特性及水分利用效率的影响 |
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| 引用本文： | 金江群,郭泉水,朱莉,许格希,刘建锋,裴顺祥.干旱和复水对崖柏光合特性及水分利用效率的影响[J].植物科学学报,2012,30(6):599-610. |
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| 作者姓名： | 金江群 郭泉水 朱莉 许格希 刘建锋 裴顺祥 |
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| 作者单位： | 1. 重庆市药物种植研究所, 重庆 408435;
2. 中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境重点实验室, 北京 100091;
3. 河南科技大学农学院, 河南洛阳 471003;
4. 北京林业大学省部共建森林培育与保护教育部重点实验室, 北京 100083;
5. 中国林业科学研究院林业研究所, 北京 100091;
6. 中国林业科学研究院华北林业实验中心, 北京 102300 |
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| 基金项目： | 国家林业局野生动植物保护专项[珍稀濒危物种崖柏野外救护与人工繁育(优化项目)(1691000401),大巴山国家级自然保护区管理局“崖柏救护繁育研究”(2008-1)];中央公益性科研院所专项基金(RIF2010-15) |
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| 摘 要： | 以4年生崖柏(Thuja sutchuenensis Franch.)盆栽实生苗为材料,试验干旱和复水对崖柏光合特性及水分利用效率的影响。结果显示,在自然干旱处理过程中,叶片相对含水量(LRWC)在土壤相对含水量(SRWC)降至30%之后开始出现下降;净光合速率(Pn)、蒸腾速率(Tr)、胞间CO2浓度(Ci)、光饱和点(LSP)和最大光合速率(Pmax)随着土壤可利用水分的减少而逐渐降低;而表观量子效率(Q)、表观量子需要量(1/Q)及光补偿点(LCP)未发生明显变化;水分利用效率(WUE)则随着SRWC的下降而逐渐提高。在停止浇水50 d后(SRWC下降约95%),叶片萎蔫,净光合速率接近零,复水后3 d,净光合速率(Pn)恢复至对照的88.59%,WUE降至对照的88.63%。通过干旱-复水一系列生理指标的变化分析认为,崖柏为干旱避免型植物。
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| 关 键 词： | 光合特性 复水 崖柏 干旱胁迫 水分利用效率 |
Photosynthetic Characteristics and Water Use Efficiency of Thuja sutchuenensis Franch. During Water Stress and Recovery |
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| JIN Jiang-Qun,GUO Quan-Shui,ZHU Li,XU Ge-Xi,LIU Jian-Feng,PEI Shun-Xiang.Photosynthetic Characteristics and Water Use Efficiency of Thuja sutchuenensis Franch. During Water Stress and Recovery[J].Plant Science Journal,2012,30(6):599-610. |
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| Authors: | JIN Jiang-Qun GUO Quan-Shui ZHU Li XU Ge-Xi LIU Jian-Feng PEI Shun-Xiang |
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| Institution: | 1.Institute of Chongqing Medical Plant Cultivation,Chongqing 408435,China;2.Research Institute of Forest Ecology and Protection, CAF,Key Laboratory of Forest Ecology and Environment,State Forestry Administration,Beijing 100091,China;3.College of Agriculture, Henan University of Science and Technology,Luoyang,Henan 471003,China;4.Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,Beijing 100083,China;5.Research Institute of Forestry, Chinese Academy of Forestry/Key Laboratory of Tree Breeding and Cultivation,SFA,Beijing 100091,China; 6.Experimental Centre of Forestry in North China,Chinese Academy of Forestry,Beijing 102300,China) |
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| Abstract: | Photosynthetic characteristics and water use efficiency (WUE) were monitored in four year old seedlings of Thuja sutchuenensis Franch.during drought stress and recovery.Results showed that leaf relative water content (LRWC) decreased after soil relative water content (SRWC) fell below 30% under water stress.Net photosynthetic rate(Pn),transpiration rate (Tr), intercellular CO2 concentration (Ci),light saturation point (LSP)and the maximum photosynthetic rate (Pmax) decreased along with available water reduction, while apparent quantum yield (Q),apparent quantum requirement (1/Q),and light compensation point (LCP) remained.The WUE gradually increased as SRWC fell.Pn reached zero due to leaf wilting after 50 days drought stress (SRWC decreased about 95%).After three days of rewatering, Pn recovered to 88.59% of the control levels and WUE reduced to 88.63% that of the control levels.Through the analysis of physical signs above,we concluded that Thuja sutchuenensis Franch.is a drought-avoiding plant. |
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| Keywords: | Photosynthetic characteristics Recovery Thuja sutchuenensis Drought stress Water use efficiency |
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