![]() ![]() Modelling below- and above-ground biomass for non-woody and woody plants. Winter at the alpine timberline causes complex within-tree patterns of water potential and embolism in Picea abies. Annals of the Association of American Geographers, 88, 183-208. Response of the central Canadian treeline to recent climatic changes. ![]() MacDonald GM, Szeicz JM, Claricoates J, Dale KA ( 1998). Impact of climate fluctuations on mountain environments in the Canadian Rockies. Therefore, the treeline and its constructive species are mainly affected by temperature at the large spatio-temporal scale, while influenced by temperature and ambient environment at the small spatio-temporal scale. Furthermore, the number of trees also increased significantly by 220% and 100%, respectively. Besides, their treeline positions were increased by 75 and 40 m, respectively. Compared with 20 years ago, tree species lines of the Zheduo Mountain and Jianziwan Mountain were shifted upwards by 50 and 30 m, respectively. However, the number of trees in the Zheduo Mountain increased by about 25%. Compared with 10 years ago, there was no significant change at the position of treeline and tree species line of the Zheduo Mountain and the Jianziwan Mountain, neither of the tree density in the Jianziwan Mountain. The fir trees (Abies spp.) at the upper part of the treeline ecotone presented an allometric growth, whose height growth rate was higher than that of base growth, while the relationships between height growth and base growth were isometric at almost mid and lower part of the treeline ecotone. Both tree height and base diameter decreased with the increase of elevation. squanmata of the Jianziwan Mountain was randomly distributed due to the impact of surrounding environmental factors. fabri was aggregated at the Zheduo Mountain, while A. Within the two transects, due to the limitation of seed diffusion, the dominate species showed aggregated distributions at the small scale. squamata from the Jianziwan Mountain showed a reversed āJā shape curve and a bimodal shape, respectively. The age structure of Abies fabri from the Zheduo Mountain and A. The precipitation has decreased slightly in both the Zheduo Mountain and Jianziwan Mountain. Important findings The temperatures of the two research areas have increased during the past 58 years. Detailed information of each tree species treeline, including species name, latitude, longitude, height, age, base diameter, and coordinates, was recorded accordingly. Top and bottom of each transects were lain between species line and forest line, respectively. Methods Two vertical belt-transect plots were established in each treeline ecotone of the Zheduo Mountain and Jianziwan Mountain of the eastern Qinghai-Xizang Plateau. The present study focused on the spatio-temporal dynamics of treeline and ecological characteristics of the tree species in two treeline ecotones. ![]() Therefore, it is important to understand the response mechanisms of alpine treeline as well as their tree species under the global climate change. Aims Temperature limit is the main cause of alpine treeline formation. ![]()
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