欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
采用开顶式生长室（open—topchamber，OTC）模拟增温的方法，研究了模拟增温对川西亚高山林线交错带绵穗柳生长和叶性状的影响．结果表明：与对照样地相比，OTC内日平均气温（地上1．2m）在植物生长季中增加2．9℃，而5cm土壤温度仅增加0．4℃；温度升高使绵穗柳芽开放时间明显提前、落叶时间明显推迟，叶寿命延长；OTC内绵穗柳叶面积和侧枝生长速率明显加快，比叶面积明显增加，而叶氮浓度却显著下降；OTC内绵穗柳的气孔导度、净光合速率、光呼吸速率和暗呼吸速率总体上呈增加趋势．综上所述，绵穗柳适应增温效应的能力较强，在未来气候变化背景下，其分布的海拔高度有可能上升．
英文摘要：
By using open-top chamber （ OTC）, the effects of simulated warming on the growth, leaf phenology, and leaf traits of Salix eriostachya in sub-alpine timberline ecotone of Western Sichuan were studied. The results showed that comparing with the control, the mean air temperature at 1.2 m above the ground throughout S. eriostachya growth season in OTC increased by 2. 9 ℃, while the soil temperature at the depth of 5 cm only increased by 0. 4 ℃. The temperature increase in OTC made S. eriostachya budding advanced and defoliation postponed obviously, and the leaf life-span longer. The leaf and branch growth rates as well as the specific leaf area in OTC increased obviously, whereas the leaf nitrogen concentration decreased significantly. In OTC, the stomata conductance, net photosynthetic rate, photorespiration, and dark respiration rate of S. eriostachya all exhibited an increasing trend. It was suggested that S. eriostachya had stronger capability to adapt to warming, and, under the background of future global climate change, the elevation of S. eriostachya distribution in the timberline ecotone would be likely to ascend.
同期刊论文项目
同项目期刊论文
Leaf photosynthesis of Betula albosinensis seedlings as affected by elevated CO2 and planting densit
Carbon stock and allocation of five restoration ecosystems in subalpine coniferous forest zone in We
Effects of elevated CO2 and temperature on growth and morphology of fir (Abies faxoniana) and native
期刊信息
位置：