Knowledge Resource Center for Ecological Environment in Arid Area
| 模拟三峡库区消落带土壤水分变化条件下水松幼苗的光合生理响应 | |
| 其他题名 | Photosynthetic physio-response of Glyptostrobus pensilis seedlings to mimic soil water changes in the hydro-fluctuation belt of the Three Gorges Reservoir Area |
| 李昌晓; 钟章成 | |
| ISSN | 1000-1522 |
| 出版年 | 2007 |
| 卷号 | 29期号:3页码:23-28 |
| 中文摘要 | 通过模拟三峡库区消落带土壤水分变化特征,设置了常规生长水分条件(NG)、轻度干旱水分胁迫(LD)、土壤水饱和(SW)以及水淹(BS)4个不同处理组,研究水松当年实生幼苗在三峡库区消落带水位变化条件下的光合生理生态响应机理和适应性.研究结果表明,不同水分处理均显著影响水松叶片光合气体交换参数以及表观资源利用效率.水松幼苗LD组在整个处理期的净光合速率(P_n)平均值显著低于NG组22.025%;与SW、BS组的P_n平均值分别高于NG组18.608%、48.987%形成鲜明对比.与此同时,水松幼苗LD组的气孔导度(G_s)平均值显著低于NG组10.218%;SW和BS组的G_s平均值则分别显著高于NG组40.708%、87.566%.水松幼苗对土壤水分变化具有敏感的光合响应能力,在充足和较多水分条件下表现出增益的正向光合响应,显示出很强的耐水湿特点;但对于干旱水分胁迫则表现出不利的负向光合响应.在消落带防护林体系建设中,水松适宜栽植于土壤饱和水或渍水的环境中,尤其是在根部土壤水淹条件下其净光合速率达到最高;在干旱环境条件下则应注意浇水抗旱,使水松保持正常的净光合速率. |
| 英文摘要 | A simulation of soil water changes in the hydro-fluctuation belt of the Three Gorges Reservoir Area was carried out to research the likely photosynthetic eco-physioresponses and corresponding adaptive strategies of Glyptostrobus pensilis seedlings. Four kinds of water treatments were simulated, including normal growth water condition ( NG) , light drought stress ( LD) , growth under soil water saturation ( SW) and growth with belowground soil submersion (BS) . The results showed that different water treatments could significantly influence the parameters of leaf gas exchange and the apparent efficiency of resource use of G. pensilis seedlings. The mean net photosynthetic rate (P_n) of G. pensilis seedlings in LD was 22.025% lower than that in NG over the experimental period. In contrast, the means of P_n in both SW and BS were 18.608% and 48.987 % higher than that in NG. Meanwhile, compared with NG, the mean of G_s in LD was significantly lower by 10.218% ; whereas the means of G_s in both SW and BS were significantly higher than those in NG by 40.708% and 87.566%, respectively. It demonstrates that G. pensilis seedlings are flood-tolerant and drought-sensitive, with a positive photosynthetic response to sufficient and over-supply of soil water. This is in contrast with a negative photosynthetic response to drought water stress. For the building of a protective forest system in the hydro-fluctuation belt of the Three Gorges Reservoir Area, the species of G. pensilis is suitable for planting in the conditions of root submersion or SW. Root submersion most favors photosynthesis because it allows P_n to reach its highest point. In cases where G. pensilis is in arid conditions, it should be watered appropriately to maintain its normal P_n . |
| 中文关键词 | 三峡库区 ; 消落带 ; 水位变化 ; 水松幼苗 ; 光合生理响应 |
| 英文关键词 | Three Gorges Reservoir Area hydro-fluctuation belt water-level changes Glyptostrobus pemilis seedlings photosynthetic physio-response |
| 语种 | 中文 |
| 国家 | 中国 |
| 收录类别 | CSCD |
| WOS类目 | FORESTRY |
| WOS研究方向 | Forestry |
| CSCD记录号 | CSCD:2834602 |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/220661 |
| 作者单位 | 西南大学生命科学学院, 教育部三峡库区生态环境重点实验室 |
| 推荐引用方式 GB/T 7714 | 李昌晓,钟章成. 模拟三峡库区消落带土壤水分变化条件下水松幼苗的光合生理响应[J],2007,29(3):23-28. |
| APA | 李昌晓,&钟章成.(2007).模拟三峡库区消落带土壤水分变化条件下水松幼苗的光合生理响应.,29(3),23-28. |
| MLA | 李昌晓,et al."模拟三峡库区消落带土壤水分变化条件下水松幼苗的光合生理响应".29.3(2007):23-28. |
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