Effects of phenological changes on non-structural carbohydrates in leaves of dominant species in the cold temperate forest

doi:10.13287/j.1001-9332.202412.005

Abstract

Abstract: To investigate the impacts of phenological changes in cold-temperate zones on the concentrations of non-structural carbohydrates (NSCs) and their components in leaves, we selected dominant tree species from different forest communities (Larix gmelinii forest, Betula platyphylla forest, and Populus davidiana forest). Leaf samples were collected based on phenological rhythms to explore the influence of phenological changes on leaf NSCs. The results showed that the contents of soluble sugar, starch, and NSC in the leaves of the three tree species exhibited significant phenological changes. Soluble sugar content was significantly higher than starch content, accounting for 73.7% to 96.3% of leaf NSCs. As phenological rhythms changed, foliar NSC and soluble sugar contents in the three tree species showed a unimodal pattern, while starch content fluctuated. Foliar NSC content of the three tree species was the lowest at the early stage of leaf expansion. The NSC content of P. davidiana was the lowest among the three tree species. From full leaf expansion to the leaf discoloration phase, the NSC content in the leaves of B. platyphylla and P. davidiana was higher than that of L. gmelinii. The peak NSC content occurred during the leaf discoloration phase, with P. davidiana (151.36 g·kg^-1) > B. platyphylla (146.64 g·kg^-1) > L. gmelinii (132.20 g·kg^-1). During the leaf-fall period, the NSC content in the leaves decreased, with P. davidiana showing the largest decrease at 61.8%. Redundancy analysis indicated that soil temperature and available nitrogen content had significant effects on the NSC and its components. There were certain time differences in the phenological periods of the dominant species in the cold-temperate forest. The impact of phenological changes on leaf NSC content showed similar trends among different species, with the effect being more pronounced in B. platyphylla and P. davidiana than in L. gmelinii. Such a result indicated that different tree species in cold-temperate zones respond differently to climate change.

Key words: non-structural carbohydrates (NSC), soluble sugar, cold temperate forest, phenological period, leaf

NIU Yuetong, MAN Xiuling. Effects of phenological changes on non-structural carbohydrates in leaves of dominant species in the cold temperate forest[J]. Chinese Journal of Applied Ecology, 2024, 35(12): 3323-3328.

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