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Structure and regeneration dynamics of three forest types at different succession stages of spruce – fir mixed forest in Changbai Mountain, northeastern China 被引量:6
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作者 GUO Wei-wei WANG Xin-jie +4 位作者 KANG Xin-gang ZHANG Qing MENG Jing-hui ZHANG Meng-tao JI Lei 《Journal of Mountain Science》 SCIE CSCD 2017年第9期1814-1826,共13页
Analyzing and understanding the structure and growth dynamics of forests at different stages is helpful to promote forest succession, restoration and management. Three spots representing three succession stages of spr... Analyzing and understanding the structure and growth dynamics of forests at different stages is helpful to promote forest succession, restoration and management. Three spots representing three succession stages of spruce-fir mixed forest(SF: polar-birch secondary forest, MF: spruce-fir mixed forest and PF: spruce-fir near primary forest) were established. Structure, growth dynamics during two growth seasons for dominant tree species, regeneration were examined, and a univariate O-ring function statistic was used to analyze the spatial patterns of main regeneration tree species. Results showed that,(1) composition of tree species, periodic annual increment(PAI) of the diameter at breast height(DBH), basal area for overstory trees and of ground diameter(DGH) for saplings, were significantly different with the succession;(2) the current species composition and regeneration dynamics of SF suggested a development towards spruce-fir mixed forests. Pioneer species like Betula platyphyllaa will gradually disappear while climax species, such as Abies nephrolepis, Pinus koraiensis, Picea koraiensis and Tilia amurensis will dominate forest stands;(3) Despite the highest volume occurring in PF, and saplings in it grew better than in the others, this forest type is unstable because of its unsustainable structure of DBH class and insufficient regeneration; and(4) MF had the most reasonable distribution of DBH class for adult trees(DBH > 5.0 cm) and DGH class for saplings(H ≥30 cm and DBH ≤5 cm), as well as an optimal volume increment. Limiting canopy opening size can lessen the physiological stress and promote the growth and competitive status of regeneration. Management implications for increasing the gaps and thus creating better growth conditions for understory saplings and facilitating forest succession were discussed. 展开更多
关键词 Forest succession Saplings Structure and growth Spatial pattern Changbai Mountain
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Top Executive Succession in Chinese Corporations
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作者 冯天丽 井润田 王国锋 《Journal of Electronic Science and Technology of China》 2006年第4期318-322,共5页
Top executive succession is one of the most crucial events in the life of any firm. Based on the database of Chinese Entrepreneur Survey System, this research firstly reports new factors that influence the likelihood ... Top executive succession is one of the most crucial events in the life of any firm. Based on the database of Chinese Entrepreneur Survey System, this research firstly reports new factors that influence the likelihood of succession in Chinese corporations, which may not exist in western companies, then tests previous western research result in Chinese information technology (IT) industry and traditional industry. The results are hopefully to enlighten the reform of corporations during the period of China transitional economy. 展开更多
关键词 top executives succession pattern IT industry
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