Based on the tree-ring growth characteristics of Erman＇s birch （Betula ermanii charm.） and the relationships between it and climatic ）＇actors at elevation of 1950m, the sensitivity of tree lines in Changbai Mount...Based on the tree-ring growth characteristics of Erman＇s birch （Betula ermanii charm.） and the relationships between it and climatic ）＇actors at elevation of 1950m, the sensitivity of tree lines in Changbai Mountain to climatic factors was assessed. The results indicated tree line forest in Changbai Mountain had an obvious sensitivity to climate factors. However, difference from other study sits is that the main climatic control factor on tree-ring growth was not current growth season temperatures, as might be expected, but previous winter and current March temperature. Although the precipitation in the region was quite abundant, the tree-ring growth was still significantly correlated with the precipitation during previous winter and current spring. Additionally, climatic factors which influenced the Erman＇s birch growth were not the yearly variables, but seasonal and monthly variables. Therefore, the reported increase in yearly mean temperature and total yearly precipitation since 1980s was not responded by sustained increase in ring widths in recent decades.展开更多
Li Ni1-x-yCoxMnyO2材料是一种锂离子电池三元正极材料,在比容量、合成工艺以及控制成本上具有综合优势,是目前取代Li Co O2正极材料在锂离子电池市场中主流地位最具有竞争性的材料之一。对锂离子电池正极三元材料制备方法的研究进展进...Li Ni1-x-yCoxMnyO2材料是一种锂离子电池三元正极材料,在比容量、合成工艺以及控制成本上具有综合优势,是目前取代Li Co O2正极材料在锂离子电池市场中主流地位最具有竞争性的材料之一。对锂离子电池正极三元材料制备方法的研究进展进行了综述,介绍了各种制备方法的优缺点,并对其商业化应用前景进行了展望和评价。展开更多
基金This research was supported by the National Natural Science Foundation of China （N0.70373044 ＆ 30470302） and Ph.D. Startup Found from Institute of Applied Ecology. Chinese Academy of Sciences.
文摘Based on the tree-ring growth characteristics of Erman＇s birch （Betula ermanii charm.） and the relationships between it and climatic ）＇actors at elevation of 1950m, the sensitivity of tree lines in Changbai Mountain to climatic factors was assessed. The results indicated tree line forest in Changbai Mountain had an obvious sensitivity to climate factors. However, difference from other study sits is that the main climatic control factor on tree-ring growth was not current growth season temperatures, as might be expected, but previous winter and current March temperature. Although the precipitation in the region was quite abundant, the tree-ring growth was still significantly correlated with the precipitation during previous winter and current spring. Additionally, climatic factors which influenced the Erman＇s birch growth were not the yearly variables, but seasonal and monthly variables. Therefore, the reported increase in yearly mean temperature and total yearly precipitation since 1980s was not responded by sustained increase in ring widths in recent decades.
基金This research was supported by Ph.D. Startup Funding and Overseas Scholar Funding from Institute of Applied Ecology, Chinese Academy of Sciences and funding from Opened Research Station of Changbai Mountain Forest Ecosystems.
文摘Li Ni1-x-yCoxMnyO2材料是一种锂离子电池三元正极材料,在比容量、合成工艺以及控制成本上具有综合优势,是目前取代Li Co O2正极材料在锂离子电池市场中主流地位最具有竞争性的材料之一。对锂离子电池正极三元材料制备方法的研究进展进行了综述,介绍了各种制备方法的优缺点,并对其商业化应用前景进行了展望和评价。
基金Foundation project： This research was jointly supported by the National Natural Science Foundation of China （70373044＆30470302）, China＇s Ministry of Science and Technology （04EFN216600328）, and Northeast Rejuvenation Program of the Chinese Academy of Sciences.
