|
|||||
|
|
| 青藏高原东缘林线交错带糙皮桦幼苗光合特性对模拟增温的短期响应 | |
| 引用本文： | 徐振锋,胡庭兴,张力,张远彬,鲜骏仁,王开运.青藏高原东缘林线交错带糙皮桦幼苗光合特性对模拟增温的短期响应[J].植物生态学报,2010,34(3):263-270. |
| 作者姓名： | 徐振锋 胡庭兴 张力 张远彬 鲜骏仁 王开运 |
| 作者单位： | 四川农业大学林学院, 四川雅安 625014; 中国科学院成都生物研究所, 成都 610041; 华东师范大学上海市城市化生态过程和生态恢复重点实验室,上海 200062 |
| 基金项目： | 国家自然科学基金重大项目，四川省科技攻关项目，上海市城市化生态过程和生态恢复重点实验室开放基金 |
| 摘 要： | 采用开顶式生长室(OTC)模拟增温对植被影响的研究方法,研究了青藏高原东缘林线交错带糙皮桦(Betula utilis)光合特性对模拟增温的响应。结果表明:与对照样地相比,OTC内日平均气温(1.2m)在植物生长季中增加2.9℃,5cm土壤温度增加0.4℃。增温使糙皮桦幼苗叶片的净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)分别增加17.4%、21.4%和33.9%,但对糙皮桦幼苗叶片的水分利用率(WUE)却没有明显影响,而对糙皮桦的叶氮浓度却表现为显著的负效应。同时,增温能显著增加糙皮桦幼苗的最大同化速率(Pnmax)(+19.6%)、暗呼吸速率(Rd)(+14.3%)、表观量子效率(AQY)(+7.9%),但对其光补偿点(LCP)和光饱和点(LSP)却没有明显的影响。此外,增温使糙皮桦幼苗叶片的最大羧化速率(Vcmax)和电子传递速率(J)分别增加了12.3%和11.7%,而磷酸丙糖利用率(TPU)和CO2补偿点(CCP)对增温却并不敏感。该研究表明,模拟增温对林线糙皮桦光合生理总体上表现为正效应,这有可能帮助该物种对未来气候变化更快更好地适应。 |
| 关 键 词： | 糙皮桦 林线交错带 开顶式生长室 CO2响应曲线 光响应曲线 |
| 收稿时间： | 2009-03-02 |
Short-term gas exchange responses of Betula utilis to simulated global warming in a timberline ecotone,eastern Tibetan Plateau,China |
|
| XU Zhen-Feng,HU Ting-Xing,ZHANG Li,ZHANG Yuan-Bin,XIAN Jun-Ren,WANG Kai-Yun.Short-term gas exchange responses of Betula utilis to simulated global warming in a timberline ecotone,eastern Tibetan Plateau,China[J].Acta Phytoecologica Sinica,2010,34(3):263-270. | |
| Authors: | XU Zhen-Feng HU Ting-Xing ZHANG Li ZHANG Yuan-Bin XIAN Jun-Ren WANG Kai-Yun |
| Affiliation: | Faculty of Forestry, Sichuan Agricultural University, Ya’an, Sichuan 625014, China; Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu610041, China; Shanghai Key Laboratory of Urbanization and Ecological Restoration, East China Normal University, Shanghai 200062, China |
| Abstract: | Aims Betula utilis is an important plant in the timberline ecotone of subalpine regions,Western Sichuan China.Our objective is to determine how this species changes its photosynthetic parameters under warming conditions.Methods We studied the responses of gas exchange to simulated global warming using the open-top chamber (OTC) method.During the 2007 growing season,microclimate data between the OTC and the control (CK) were taken at 15-min intervals with an automatic recording system.In mid-August,the gas e... |
| Keywords: | Betula utilis ecotone in timberline open-top chamber Pn -C_icurve Pn -PAR curve |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《植物生态学报》浏览原始摘要信息 | |
| 点击此处可从《植物生态学报》下载免费的PDF全文 | |
