Aboveground biomass and nutrient allocation in an age-sequence of <Emphasis Type="Italic">Larix olgensis</Emphasis> plantations |
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| Authors: | Qiong Zhao Xing-yu Liu De-hui Zeng |
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| Institution: | (1) Qingyuan Experimental Station of Forest Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Road, 110016 Shenyang, China;(2) Graduate University of Chinese Academy of Sciences, 100039 Beijing, China;(3) Academy of Environmental Protection Sciences, 30029 Nanchang, Jiangxi Province, China;(4) Dalian University, 116622 Dalian, China |
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| Abstract: | Biomass and nutrient (N, P, K, Ca, Mg) stock in various aboveground tree components (stemwood, stembark, branches and leaves)
were quantified in an age sequence of pure Larix olgensis plantations (20, 35, 53 and 69 years old) in Northeast China. The results show that the aboveground biomass allocation in
various tree components was in the order of stemwood (62%–83%), branches (9%–21%), stembark (7%–11%) and leaves (1%–6%) for
all stands. The proportion of stemwood biomass to total aboveground biomass increased whereas that of other tree components
decreased consistently with stand age from 20 to 53 years old, but kept relatively constant with stand age from 53 and 69
years old. The nutrient allocation in various tree components generally followed the same pattern as the biomass allocation
(i.e. stemwood > branches > stembark > leaves). The proportion of nutrient stock in leaves to total aboveground nutrient stock
decreased consistently with increasing stand age, while that in stemwood increased with stand age from 20 to 53 years old
but then decreased from 53 to 69 years old. The rate of nutrient removal for stands was estimated at different stand ages
under different logging schemes, showing that the rate of nutrient removal would be unchanged when the rotation length was
shortened to 20 years by the harvest of stem only, but greatly increased by the harvest of total aboveground biomass. The
rate of nutrient removal would be a considerable reduction for all elements by debarking, especially for Ca. |
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