Integrative Biology Journals

JOURNAL OF FORESTRY RESEARCH ›› 2023, Vol. 34 ›› Issue (3): 595-607.DOI: 10.1007/s11676-022-01512-2

• Original Paper •     Next Articles

Response of plant, litter, and soil C:N:P stoichiometry to growth stages in Quercus secondary forests on the Loess Plateau, China

Juanjuan Zhang1,2, Xinyang Li1,2, Meng Chen1,2, Linjia Huang2,3, Ming Li1,2, Xu Zhang1,2, Yang Cao2,3,g   

  1. 1 College of Forestry, Northwest A&F University, 712100, Yangling, People’s Republic of China
    2 State Key Laboratory of Soil Erosion and Dryland Farming On Loess Plateau, Northwest A&F University, 712100, Yangling, Shaanxi, People’s Republic of China
    3 Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100, Yangling, Shaanxi, People’s Republic of China
  • Received:2022-02-12 Accepted:2022-05-18 Online:2024-10-16
  • Contact: Yang Cao

Abstract:

Ecological stoichiometry is an important indicator of biogeochemical cycles and nutrient limitations in terrestrial ecosystems. However, little is known about the response of ecological stoichiometry to plant growth. In this study, carbon (C), nitrogen (N), and phosphorus (P) concentrations were evaluated in plant tissues (trees, shrubs, and herbs), litter, and soil of young (≤ 40-year-old), middle-aged (41–60-year-old), near-mature (61–80-year-old), and mature (81–120-year-old) Quercus secondary forests on the Loess Plateau, China. Vegetation composition, plant biomass, and C stock were determined to illustrate their interaction with stoichiometry. Only tree biomass C significantly increased with stand development. Leaf N and trunk P concentrations generally increased, but branch P decreased with growth stage. Fine roots had the highest C and P concentrations at the middle-aged stage. In contrast, shrubs, herbs, litter, and soil C:N:P stoichiometry did not change significantly during stand development. Leaf N and P were positively correlated with soil C, N, P, and their ratios. However, there was no significant correlation between litter and leaves in terms of C:N:P stoichiometry. A redundancy analysis showed that soil N best explained leaf N and P variance, and tree biomass and C stock were related to biotic factors such as tree age and shrub biomass. Hierarchical partitioning analysis indicated that, compared with soil or litter variables, stand age only accounted for a relatively small proportion of leaf C, N, and P variation. Thus, secondary Quercus ecosystems might have inherent ability to maintain sensitive responses of metabolically active organs to environmental factors during stand aging. The results of this work help to elucidate the biogeochemical cycling of secondary forest ecosystems in tree development, provide novel insights into the adaptation strategies of plants in different organs and growth stages, and could be used to guide fertilization programs and optimize forest structure.

Key words: Ecological stoichiometry, Tree biomass C stock, Understory plant, Age, Stand development