Effects of stand age on soil C-N-P stoichiometry characteristics in Metasequoia glyptostroboides plantations

Shi Ge, Ruan Honghua, Fang Yu, Liu Huihui, Shi Ke, Shen Caiqin, Xu Yaming, Cao Guohua, Huo Jianjun

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2026, Vol. 50 ›› Issue (4) : 115-125.

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2026, Vol. 50 ›› Issue (4) : 115-125. DOI: 10.12302/j.issn.1000-2006.202412041

Effects of stand age on soil C-N-P stoichiometry characteristics in Metasequoia glyptostroboides plantations

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Abstract

【Objective】This study investigated the effects of stand age on soil carbon (C), nitrogen (N), and phosphorus (P) concentrations and their ecological stoichiometric characteristics in Metasequoia glyptostroboides plantations, aiming to advance the understanding of soil C-N-P biogeochemical cycling and provide scientific guidance for sustainable forest management.【Method】Five M. glyptostroboides stands (aged 8, 17, 22, 32, and 42 years) were selected in Dongtai Forest Farm, Jiangsu Province. Three replicate monitoring plots (20 m × 20 m) were randomly established for each stand age. Soil samples were collected from (0, 20] cm, (20, 40] cm, and (40, 60] cm soil profiles during the growing season (July 2023) and non-growing season (January 2024).Analyzed parameters included soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), available phosphorus (AP), microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), soil water content (SWC), and pH. These measurements quantified age-related variations in soil nutrient concentrations and stoichiometric ratios (C/N, C/P, N/P).【Result】Surface accumulation of soil C and N components varied significantly with stand age. Both C and N concentrations increased markedly from young stands (8 a) to middle-aged stands (17 a). However, C concentrations progressively declined from middle-aged (17 a) to over-mature stands (42 a), while N concentrations decreased from middle-aged (17 a) to mature stands (32 a), with partial recovery in over-mature stands (42 a). Stand age and soil depth showed no significant impact on TP. The mean stoichiometric ratios (C/N is 11.90; C/P is 61.00; N/P is 5.20) were notably lower than national averages, indicating limited availability of C and N in regional soils. Vertical stratification revealed higher C/N ratios in deeper soil layers (> 20 cm) compared to surface layers, while surface soils exhibited elevated C/P and N/P ratios. Ecological stoichiometric relationships highlighted nitrogen as the primary limiting factor for soil nutrient cycling.【Conclusion】Afforestation in coastal reclaimed areas and appropriate extension of rotation periods enhance soil fertility in M. glyptostroboides plantations. These findings establish a theoretical foundation for sustainable management practices and deepen insights into soil organic carbon cycling mechanisms in forest ecosystems.

Key words

Metasequoia glyptostroboides plantation / ecological stoichiometry characteristics / forest age / soil physicochemical properties / coastal reclaimed area / rotation period

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Shi Ge , Ruan Honghua , Fang Yu , et al . Effects of stand age on soil C-N-P stoichiometry characteristics in Metasequoia glyptostroboides plantations[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2026, 50(4): 115-125 https://doi.org/10.12302/j.issn.1000-2006.202412041

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