Chinese Journal of Applied Ecology
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ZHANG Hai-yan, WANG Chuan-kuan, WANG Xing-chang, CHENG Fang-yan
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Abstract: Taking the two diffuseporous tree species Betula platyphylla and Tilia amurensis in a temperate forest in Northeast China as test objects, this paper studied the spatial variation of the nonstructural carbohydrates (NSC) concentrations in the stem xylem after leaffall. For the two tree species, the concentrations of total nonstructural carbohydrate (TNC, soluble sugars plus starch) and soluble sugars in the stem xylem decreased gradually with the increasing depth from cambium to pith, whereas the starch concentration showed little radial variation. There was still a substantial amount of NSC in the inner wood close to pith. The concentrations of the NSC in the two species stems decreased gradually from the stump to the breast height, and then increased vertically. The maximum concentrations of the TNC, soluble sugars, and starch occurred at different heights, depending on the species and the TNC components. The ratio of sugar to starch showed a contrasting vertical trend for the two species, i.e., increasing from the stump to the top for B. platyphylla, but decreasing for T. amurensis. The estimation error of the stem NSC storage was mainly from the axial variation, and then, from the radial variation of NSC concentration. The TNC concentration (1.0% dry mass) in the stem of shadeintolerant species B. platyphylla was significantly lower than that (4.3% dry mass) of shadetolerant species T. amurensis, which could be related to their different lifehistory strategies. Applying the sampling protocols considering the axial and radial variations of NSC could effectively reduce the potential uncertainty in estimating the NSC storage at tree or stand level.
ZHANG Hai-yan, WANG Chuan-kuan, WANG Xing-chang, CHENG Fang-yan. Spatial variation of nonstructural carbohydrates in Betula platyphylla and Tilia amurensis stems.[J]. Chinese Journal of Applied Ecology.
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URL: https://www.cjae.net/EN/abstract/abstract11072.shtml
https://www.cjae.net/EN/Y2013/V24/I11/3050