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Dendroecological study of a subalpine fir (<Emphasis Type="Italic">Abies fargesii</Emphasis>) forest in the Qinling Mountains,China
Authors:Haishan Dang  Mingxi Jiang  Yanjun Zhang  Gaodi Dang  Quanfa Zhang
Institution:(1) Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan, 430074, People’s Republic of China;(2) Foping National Nature Reserve, Foping, 723400, Shaanxi, People’s Republic of China
Abstract:Dendroecological techniques were used to investigate the stand dynamics and the disturbance history of the subalpine fir forest in the Qinling Mountains of Shaanxi Province, China. The results indicated that 68% of the fir trees experienced 1–2 release events for a total of 10–29 (an average of 15.8) years, and 1–2 suppression events for a total of 10–27 (an average of 13.4) years before they reached canopy. Large number of Abies fargesii and Betula albo-sinensis recruitment coincided temporally with larger increases in the ring-width index from the 1830s to 1880s, suggesting occurrence of a major stand-wide disturbance during this time period. Few seedlings and saplings were found in the forest, and there was a dramatic decline in recruitment after 1890, probably because of the intensive cover of understory umbrella bamboo (Fargesia spathacea). Radial growth analyses indicated frequent canopy opening resulting from small-scale disturbances in the forest. Thus, the subalpine fir forest experienced frequent small-scale disturbances and infrequent large-scale disturbances in its developmental history, and these disturbances coupled with the understory umbrella bamboo might have influenced tree growth and species recruitment.
Keywords:Growth release  Age distribution  Disturbance  Subalpine fir forest  The Qinling Mountains
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