Welcome to Chinese Journal of Ecology! Today is Share:

Chinese Journal of Ecology ›› 2021, Vol. 40 ›› Issue (5): 1264-1274.doi: 10.13292/j.1000-4890.202105.022

Previous Articles     Next Articles

Allocation of nonstructural carbohydrates of different aged Pinus sylvestris var.mongolica in sandland.

WANG Kai1*, PANG Ying-ying1, ZHANG Ri-sheng2, SHEN Chao1, SONG Li-ning3   

  1. (1College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China; 2Liaoning Institute of Sandy Land Control and Utilization, Fuxin 123000, Liaoning, China; 3Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China).
  • Online:2021-05-10 Published:2021-05-07

PDF (PC)

97

Abstract: The concentration and allocation of non-structural carbohydrates (NSC) reflect carbon supply and demand of trees, which is a crucial factor determining the survival and growth of trees. To understand carbon dynamics in different growth stages of Pinus sylvestris var. mongolica, we analyzed the concentrations of NSC, soluble sugar, and starch, and ratio of soluble sugar to starch in needles, branches, and roots of P. sylvestris var. mongolica across a chronosequence (12-, 22-, 31-, 42-, 52-, and 59-year-old) and examined the carbon allocation and balance relationships. The results showed that, with the increases of stand age, NSC concentrationsdecreased first and then increased, whereas soluble sugar concentrations increased and subsequently reduced in current-year needles. However, NSC concentrations in one- and two-year-old needles showed a downward trend with an exception at the stand of 42 years old. The concentrations of NSC and soluble sugar in current-year-old and one-year-old branches exhibited trends of initial decreasing and then increasing afterward decreasing, while NSC and starch concentrations in two-year-old branches first reduced and subsequently rose. Soluble sugar concentrations showed upward trends in two-year-old branches with stand age. Starch concentrations decreased whereas ratios of soluble sugar to starch increased in roots after the age of 31 years. In general, NSC, soluble sugar and starch concentrations in each organ followed the order of needle > branch > root, while their variabilities followed the order of root > branch > needle. The variability of ratios of soluble sugar to starch followed the order of needle and root > branch. Our results indicated that concentrations of NSC and its components and proportions among different organs of P. sylvestris var. mongolicavaried with stand age. Trees would decline when starch in roots was consumed and the allocation of NSC among organs was imbalanced.

Key words: Pinus sylvestris var. mongolica, carbon allocation, organ, needle age, branch age.